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OpenGL Porting from OpenGL to Directx

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Hello,

recently I have been trying to port over the OpenGL interface due to some problems with Intel Graphic chips which have a bad OpenGL driver in Windows. I need help to port a Quad in OpenGL to DirectX. Heres what i have done in OpenGL:

GL.Begin(BeginMode.Quads);
GL.TexCoord2(x1, y1);
GL.Vertex3(rx1, ry1, rect.Z + CGraphics.ZOffset);

GL.TexCoord2(x1, y2);
GL.Vertex3(rx1, ry2, rect.Z + CGraphics.ZOffset);
GL.TexCoord2(x2, y2);
GL.Vertex3(rx2, ry2, rect.Z + CGraphics.ZOffset);
GL.TexCoord2(x2, y1);
GL.Vertex3(rx2, ry1, rect.Z + CGraphics.ZOffset);
GL.End();


And here is what I am doing for DirectX rx1 = ((rx1 * 2) / ClientSize.Width) -1f;
rx2 = ((rx2 * 2) / ClientSize.Width) - 1f;
ry1 = ((ry1 * 2) / ClientSize.Height) - 1f;
ry2 = ((ry2 * 2) / ClientSize.Height) - 1f;

DataStream stream = _VertexBuffer.Lock(0, 0, LockFlags.None);
stream.WriteRange(new[] {
new TexturedVertex(new Vector3(rx1, ry1, 0), new Vector2(x1, y1)),
new TexturedVertex(new Vector3(rx1, ry2, 0), new Vector2(x1, y2)),
new TexturedVertex(new Vector3(rx2, ry2, 0), new Vector2(x2, y2)),
new TexturedVertex(new Vector3(rx2, ry1, 0), new Vector2(x2, y1)),
});
_VertexBuffer.Unlock();
m_Device.SetTexture(0, _D3DTextures[Texture.index]);
m_Device.SetStreamSource(0, _VertexBuffer, 0, Marshal.SizeOf(typeof(TexturedVertex)));
m_Device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2);


Unfortunetely the Textures are mirrored and the alpha Channel is displayed in black. I hope you can help me, I have been trying to get this working for 2 days now =/

Best regards xDarkice

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To mirror the texture, negate the v component of the texture coordinate. D3D and OpenGL consider the "up" direction differently in this case.

To blend with alpha channel, you need to enable the alphablend render state, and set the blend source and destination states accordingly.

As a side note, you don't want to be locking the vertex buffer at each frame if you don't need to. If you have a genuine need to do so, use a vertex buffer with dynamic usage flag specified. Excessive locking can cause stalling because the hardware can't use the buffer for rendering while it is locked to you. Requesting dynamic usage hints the driver to allocate the buffer to a physical memory resource that allows fast write usage at the expense of rendering performance (though choosing the actual allocation strategy is still up to the driver).

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Thanks for your answer! After setting m_Device.SetRenderState(RenderState.AlphaBlendEnable, true);
m_Device.SetRenderState(RenderState.DestinationBlend, Blend.InverseSourceAlpha);
m_Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);

Alpha textures seem to render almost properly. But there are still some black blocks left.

Negating the y cords seems to work for the mirror part but the image is still some of sort of upset down. The main menu texture should be top. The ry1 and ry2 coordinates seem to be incorrect. Am I calculating them wrong? On top of that my Textures seem to be blurry and there might be a part missing ry1 = ((ry1 * 2) / CSettings.iRenderH) - 1f;
ry2 = ((ry2 * 2) / CSettings.iRenderH) - 1f;

I am multiplicating my coordinates by 2 and dividing them by the heigth and substracting 1.

I think I do not need to lock the buffer each frame. What should i initialize my DataStream with? Right now I am using DataStream stream = _VertexBuffer.Lock(0, 0, LockFlags.None);

The second picture shows how it is rendering in OpenGL. I disabled the background video in DirectX for testing purposes.

Now I just need to find a way to color the textures. But I think I can just add a new Color in my TexturedVertex struct.

Thanks for your help!

EDIT: I got the upside down fixed! I didnt had to negate y1 and y2, but ry1 and y2. But the blurry textures and texts arent fixed yet
EDIT2: The Black Bars seem to appear for a whitespace in a text

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OpenGL interprets screen-space positions as the centre of the pixel
DirectX interprets screen-space positions as the top-left corner of the pixel
(Or is it the other way round?)

Either way, to stop your textures from blurring, you need to subtract 0.5 from your screen-space positions when changing between OpenGL and DX. This is like shifting them up-left by 0.5 pixels. So they will still fill the same pixels, but it will affect how the texture coordinates are interpolated, and should stop the blurring

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I believe the black bars appear because your text rendering logic actually generates black rectangles with alpha of 1.0 to fill whitespace. Check your code that generates the triangles for the glyphs.

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Regarding locking, only do so when you actually change the text contents. You can't get the DataStream any other way than locking the buffer, nor can you keep the reference to it between frames (because it would keep the resource locked).

You can change the text color by modulating the rgb of the texture with a constant color factor, instead of locking the buffer. In fixed function pipeline, this is achieved by setting appropriate texture stage states, and in a pixel shader the operation is a single multiplication.

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I think the black bars appear because texture transparency is not drawn properly. For example my main menu bar should be drawn a little bit transparent like in the openGL pickture I included above.
My DrawGlyph function does render a transparent texture at whitespaces. This shouldnt be the problem because it is working in OpenGL aswell.

EDIT: I am providing my AddTexture and DrawTexture function:

public STexture AddTexture(Bitmap bmp, string TexturePath)
{
STexture texture = new STexture(-1);
if (bmp.Height == 0 || bmp.Width == 0)
return texture;
int MaxSize;
switch (CConfig.TextureQuality)
{
case ETextureQuality.TR_CONFIG_TEXTURE_LOWEST:
MaxSize = 128;
break;
case ETextureQuality.TR_CONFIG_TEXTURE_LOW:
MaxSize = 256;
break;
case ETextureQuality.TR_CONFIG_TEXTURE_MEDIUM:
MaxSize = 512;
break;
case ETextureQuality.TR_CONFIG_TEXTURE_HIGH:
MaxSize = 1024;
break;
case ETextureQuality.TR_CONFIG_TEXTURE_HIGHEST:
MaxSize = 2048;
break;
default:
MaxSize = 512;
break;
}

int w = bmp.Width;
int h = bmp.Height;

if (h >= w && w > MaxSize)
{
h = (int)Math.Round((float)MaxSize / bmp.Width * bmp.Height);
w = MaxSize;
}

if (w >= h && h > MaxSize)
{
w = (int)Math.Round((float)MaxSize / bmp.Height * bmp.Width);
h = MaxSize;
}

Bitmap bmp2 = new Bitmap(w, h);
Graphics g = Graphics.FromImage(bmp2);
g.DrawImage(bmp, new Rectangle(0, 0, w, h));
g.Dispose();


texture.width = bmp2.Width;
texture.height = bmp2.Height;
texture.w2 = texture.width;
texture.h2 = texture.height;

texture.width_ratio = texture.width / texture.width;
texture.height_ratio = texture.height / texture.height;

BitmapData bmp_data = bmp2.LockBits(new Rectangle(0, 0, bmp2.Width, bmp2.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
using (MemoryStream stream = new MemoryStream())
{
bmp2.Save(stream, ImageFormat.Bmp);
stream.Position = 0;
//Texture t = Texture.FromStream(m_Device, stream);
Texture t = Texture.FromStream(m_Device, stream, 0, w, h, 0, Usage.None, Format.A8R8G8B8, Pool.Managed, Filter.Default, Filter.Linear, 0);
t.AutoMipGenerationFilter = TextureFilter.Linear;
t.GenerateMipSublevels();
//t = Texture.FromStream(m_Device, stream);
_D3DTextures.Add(t);
}
bmp2.UnlockBits(bmp_data);
bmp2.Dispose();

// Add to Texture List
texture.index = _D3DTextures.Count - 1;
texture.color = new SColorF(1f, 1f, 1f, 1f);
texture.rect = new SRectF(0f, 0f, texture.width, texture.height, 0f);
texture.TexturePath = String.Empty;
_Textures.Add(texture);

return texture;
}


public void DrawTexture(STexture Texture, SRectF rect, SColorF color, SRectF bounds, bool mirrored)
{
if ((Texture.index >= 0) && (_Textures.Count > 0) && (_D3DTextures.Count > Texture.index))
{
float x1 = (bounds.X - rect.X) / rect.W * Texture.width_ratio;
float x2 = (bounds.X + bounds.W - rect.X) / rect.W * Texture.width_ratio;
float y1 = (bounds.Y - rect.Y) / rect.H * Texture.height_ratio;
float y2 = (bounds.Y + bounds.H - rect.Y) / rect.H * Texture.height_ratio;

if (x1 < 0)
x1 = 0f;

if (x2 > Texture.width_ratio)
x2 = Texture.width_ratio;

if (y1 < 0)
y1 = 0f;

if (y2 > Texture.height_ratio)
y2 = Texture.height_ratio;

float rx1 = rect.X;
float rx2 = rect.X + rect.W;
float ry1 = rect.Y;
float ry2 = rect.Y + rect.H;

if (rx1 < bounds.X)
rx1 = bounds.X;

if (rx2 > bounds.X + bounds.W)
rx2 = bounds.X + bounds.W;

if (ry1 < bounds.Y)
ry1 = bounds.Y;

if (ry2 > bounds.Y + bounds.H)
ry2 = bounds.Y + bounds.H;
rect.Z = 1f;
//y1 = y1*-1;

rx1 = (((rx1-0.5f) * 2) / 1280) - 1f;
rx2 = (((rx2 -0.5f) * 2) / 1280) - 1f;
ry1 = (((ry1-0.5f) * 2) / 720) - 1f;
ry2 = (((ry2-0.5f) * 2) / 720) - 1f;

DataStream stream = _VertexBuffer.Lock(0, 0, LockFlags.None);
Color c = Color.FromArgb((int)(color.A*255), (int)(color.R*255), (int)(color.G*255), (int)(color.B*255));
stream.WriteRange(new[] {
new TexturedColoredVertex(new Vector3(rx1, ry1*-1f, rect.Z + CGraphics.ZOffset), new Vector2(x1, y1), c.ToArgb()),
new TexturedColoredVertex(new Vector3(rx1, ry2*-1f, rect.Z + CGraphics.ZOffset), new Vector2(x1, y2), c.ToArgb()),
new TexturedColoredVertex(new Vector3(rx2, ry2*-1f, rect.Z + CGraphics.ZOffset), new Vector2(x2, y2), c.ToArgb()),
new TexturedColoredVertex(new Vector3(rx2, ry1*-1f, rect.Z + CGraphics.ZOffset), new Vector2(x2, y1), c.ToArgb()),
});
_VertexBuffer.Unlock();
m_Device.VertexDeclaration= TexturedColoredVertex.GetDeclaration(m_Device);
m_Device.SetTexture(0, _D3DTextures[Texture.index]);
m_Device.SetStreamSource(0, _VertexBuffer, 0, Marshal.SizeOf(typeof(TexturedColoredVertex)));
m_Device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2);
}
}


I am looking for a way to make textures a bit transparent.

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...and you still lock the vertex buffer each time you draw it (which effectively means at least once per frame).

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Ok, thanks for your tip changing from BMP to PNG. This removed the black bars biggrin.png. Could you please provide a snippet how to not lock the Vertex buffer each frame, because I am not getting it? And i still need the textures to be a bit translucent.

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Simply don't do the lock->write->unlock in the same place where you draw. The buffer update should only be done when you actually want to change its contents, which is usually far more seldom than drawing it.

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And if you want "bit more translucent", you can adjust the alpha levels on the PNG files, or modulate the alpha of the texture by using texture stage states or (again) simple maths in the pixel shader.

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I do not need to adjust the alpha levels, because they should already be in the PNG. In OpenGL those textures are rendered translucent, but in DirectX they arent. Just compare the OpenGL and the DirectX one: In OpenGL you can see the snow falling behind the texture where "Main Menu" is drawn on. In DirectX you cant.
I think I am missing some parameters for alpha Blending, am I?

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If you have alpha blending on, the alpha factor comes from the texture stage setup or the pixel shader. If either outputs alpha of 1.0 (independent of any source textures), the drawn geometry is opaque even though blending is enabled.

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Ok i got alpha working now. Now I am stuck at creating a texture out of a byte[], height and width is given. I am doing this:

Texture t = new Texture(m_Device, W, H, 0, Usage.Dynamic, Format.A8R8G8B8, Pool.Default);
DataRectangle rect = t.LockRectangle(0, LockFlags.None);
rect.Data.WriteRange(Data);
t.UnlockRectangle(0);

But i am not getting the result I want on screen. I need this to play a video, decoded by Acinerella, so creating a Bitmap out of the byte[] would not be a good idea due to the bad performance.

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It looks like the pitch of the data is incorrect.

D3D textures have a "pitch" that is the number of bytes per line. It may or may not be equal to width * bytes per pixel, and you should not assume that it is.

The actual visible pixels are guaranteed to be at the beginning of the scanline (regardless of the pitch) so the most robust way to copy an image to a texture is to copy the data one line at a time, and shift the destination pointer by the pitch after each line until all the lines are copied. I don't know how to do this in SlimDX, though - I'm a native D3D user.

Also check that the source and destination formats are same (or at least have the same bit count per pixel).

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Also, do not create the texture each frame. This is very detrimental to performance. Instead, keep the texture reference in your code after you've created it, and merely update it when you want to change the contents.

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I am not recreating the texture each frame. I keep all textures stored in a List and they can be updated using my UpdateTexture methods. The textures are drawn in my DrawTexture methods.

Your post really helped me out. Instead of writing the data directly into the stream i am now doing this which works like a charm:

DataRectangle rect = t.LockRectangle(0, LockFlags.None);
for(int i = 0; i < Data.Length;) {
rect.Data.Write(Data, i, 4 * W);
i+= 4*W;
rect.Data.Position = rect.Data.Position - 4 * W;
rect.Data.Position += rect.Pitch;
}
t.UnlockRectangle(0);


The hopefully last minor bugs are that [s]my z-position isnt applied correctly [/s]and the textures are still a bit blurry.
The small album art should be rendered over the big one. It is working fine in OpenGL, but z-Positions can go beyond 1.0f in OpenGL. If I draw my z-Positions with values over 1f they wont show up. I am currently setting any positions over 1f to 1f which creates this bug i think.
The other thing is that the textures are not that good as in OpenGL. I experimented with some TextureFilters ending up using a linear filter, which is still not too fine. In OpenGL i am using MipMaps to have smooth textures. Can I do the same in DirectX?

EDIT: Fixed z-Positions, still need to examine why the textures are a bit blurry though I am shifting the Pixels by 0.5

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You can use mipmaps in D3D too.

In the image attached to your last post, it seems that there is not a 1:1 size correspondence between the source and target. If this is intented, be sure to enable minification, magnification and mip filtering. For mip mapping, you need to allocate and fill the mip levels (I believe there is a D3DX helper function for filling them).

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Regarding the z range, you can control it by using the viewport of the device. The viewport structure represents a mapping between physical and logical dimensions of rendering.

The default viewport has a z-range of 0...1, as you noticed.

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Could this issue also be caused because I am not using textures with sizes of a power of two? The Sizes are not the same, they need to get scaled. For instance covers of any size can be used and they need to get scaled to fit. Could my calculation of the positions be too inaccurate? I need to scale the positions down to values from 0 to 1. In OpenGL I was able to specify screen positions. Is there a setting to do this in D3D aswell?

Edit: I got it smooth now. But I am now getting small bars. After setting m_Device.SetSamplerState(0, SamplerState.MinFilter, TextureFilter.Linear);
m_Device.SetSamplerState(0, SamplerState.MagFilter, TextureFilter.Linear);
m_Device.SetSamplerState(0, SamplerState.MipFilter, TextureFilter.Linear);
I do not get the Previewvideo anymore and these small bars are appearing. Any ideas?

Edit2: m_Device.SetSamplerState(0, SamplerState.MipFilter, TextureFilter.Linear); is definetely the line which is breaking the video. Could this be due to I am not filling the video's mipmaps? This is how I am adding a new texture for a video:

public STexture AddTexture(int W, int H, ref byte[] Data)
{
STexture texture = new STexture(-1);
texture.width = W;
texture.height = H;
texture.w2 = texture.width;
texture.h2 = texture.height;
texture.width_ratio = texture.width / texture.w2;
texture.height_ratio = texture.height / texture.h2;
Texture t = new Texture(m_Device, W, H, 0, Usage.Dynamic, Format.A8R8G8B8, Pool.Default);
DataRectangle rect = t.LockRectangle(0, LockFlags.None);
for(int i = 0; i < Data.Length;) {
rect.Data.Write(Data, i, 4 * W);
i+= 4*W;
rect.Data.Position = rect.Data.Position - 4 * W;
rect.Data.Position += rect.Pitch;
}
t.UnlockRectangle(0);
_D3DTextures.Add(t);
texture.index = _D3DTextures.Count - 1;
texture.color = new SColorF(1f, 1f, 1f, 1f);
texture.rect = new SRectF(0f, 0f, texture.width, texture.height, 0f);
texture.TexturePath = String.Empty;
_Textures.Add(texture);
return texture;
}


And this is how I am updating this:

public bool UpdateTexture(ref STexture Texture, ref byte[] Data)
{
if ((Texture.index >= 0) && (_Textures.Count > 0) && (_D3DTextures.Count > Texture.index))
{
DataRectangle rect = _D3DTextures[Texture.index].LockRectangle(0, LockFlags.None);
for (int i = 0; i < rect.Data.Length; )
{
if (rect.Data.Length - rect.Data.Position > 4 * (int)Texture.width)
{
rect.Data.Write(Data, i, 4 * (int)Texture.width);
i += 4 * (int)Texture.width;
rect.Data.Position = rect.Data.Position - 4 * (int)Texture.width;
rect.Data.Position += rect.Pitch;
}
else
break;
}
rect.Data.Position = 0;
_D3DTextures[Texture.index].UnlockRectangle(0);
}
return true;
}


I do not need to use MipMaps for videos due to performance reasons, can I disable MipMaps for single textures only?

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Yes, you can disable/enable mip lookup between every draw call. Each draw call uses the state that happens to be set before it.

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Ok, I got this now. Can I force DirectX to use screen positions instead of values from 0 to 1 to set the Z-Positions and the vertexpositions much more precisely?

I think there could be some 'fighting' between the values when they are too near together. In OpenGL I can do this. Ideas?

Edit: I am trying to use this Matrix.OrthoLH(Screenwidth, Screenheight, zNear, zFar); This works, but if I am using screenpositions now for drawing, the textures are shifted to the mid of the screen. Basically, position 0,0 is the center of the screen, but I want it to be at the top left.

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You could make a matrix that scales and biases coordinates from 0...screenwidth and 0...screenheight to -1...1. This is very simple math.

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      Device resources are created by the render device. The two main resource types are buffers, which represent linear memory, and textures, which use memory layouts optimized for fast filtering. Graphics APIs usually have a native object that represents linear buffer. Diligent Engine uses IBuffer interface as an abstraction for a native buffer. To create a buffer, one needs to populate BufferDesc structure and call IRenderDevice::CreateBuffer() method as in the following example:
      BufferDesc BuffDesc; BufferDesc.Name = "Uniform buffer"; BuffDesc.BindFlags = BIND_UNIFORM_BUFFER; BuffDesc.Usage = USAGE_DYNAMIC; BuffDesc.uiSizeInBytes = sizeof(ShaderConstants); BuffDesc.CPUAccessFlags = CPU_ACCESS_WRITE; m_pDevice->CreateBuffer( BuffDesc, BufferData(), &m_pConstantBuffer ); While there is usually just one buffer object, different APIs use very different approaches to represent textures. For instance, in Direct3D11, there are ID3D11Texture1D, ID3D11Texture2D, and ID3D11Texture3D objects. In OpenGL, there is individual object for every texture dimension (1D, 2D, 3D, Cube), which may be a texture array, which may also be multisampled (i.e. GL_TEXTURE_2D_MULTISAMPLE_ARRAY). As a result there are nine different GL texture types that Diligent Engine may create under the hood. In Direct3D12, there is only one resource interface. Diligent Engine hides all these details in ITexture interface. There is only one  IRenderDevice::CreateTexture() method that is capable of creating all texture types. Dimension, format, array size and all other parameters are specified by the members of the TextureDesc structure:
      TextureDesc TexDesc; TexDesc.Name = "My texture 2D"; TexDesc.Type = TEXTURE_TYPE_2D; TexDesc.Width = 1024; TexDesc.Height = 1024; TexDesc.Format = TEX_FORMAT_RGBA8_UNORM; TexDesc.Usage = USAGE_DEFAULT; TexDesc.BindFlags = BIND_SHADER_RESOURCE | BIND_RENDER_TARGET | BIND_UNORDERED_ACCESS; TexDesc.Name = "Sample 2D Texture"; m_pRenderDevice->CreateTexture( TexDesc, TextureData(), &m_pTestTex ); If native API supports multithreaded resource creation, textures and buffers can be created by multiple threads simultaneously.
      Interoperability with native API provides access to the native buffer/texture objects and also allows creating Diligent Engine objects from native handles. It allows applications seamlessly integrate native API-specific code with Diligent Engine.
      Next-generation APIs allow fine level-control over how resources are allocated. Diligent Engine does not currently expose this functionality, but it can be added by implementing IResourceAllocator interface that encapsulates specifics of resource allocation and providing this interface to CreateBuffer() or CreateTexture() methods. If null is provided, default allocator should be used.
      Initializing the Pipeline State
      As it was mentioned earlier, Diligent Engine follows next-gen APIs to configure the graphics/compute pipeline. One big Pipelines State Object (PSO) encompasses all required states (all shader stages, input layout description, depth stencil, rasterizer and blend state descriptions etc.). This approach maps directly to Direct3D12/Vulkan, but is also beneficial for older APIs as it eliminates pipeline misconfiguration errors. With many individual calls tweaking various GPU pipeline settings it is very easy to forget to set one of the states or assume the stage is already properly configured when in fact it is not. Using pipeline state object helps avoid these problems as all stages are configured at once.
      Creating Shaders
      While in earlier APIs shaders were bound separately, in the next-generation APIs as well as in Diligent Engine shaders are part of the pipeline state object. The biggest challenge when authoring shaders is that Direct3D and OpenGL/Vulkan use different shader languages (while Apple uses yet another language in their Metal API). Maintaining two versions of every shader is not an option for real applications and Diligent Engine implements shader source code converter that allows shaders authored in HLSL to be translated to GLSL. To create a shader, one needs to populate ShaderCreationAttribs structure. SourceLanguage member of this structure tells the system which language the shader is authored in:
      SHADER_SOURCE_LANGUAGE_DEFAULT - The shader source language matches the underlying graphics API: HLSL for Direct3D11/Direct3D12 mode, and GLSL for OpenGL and OpenGLES modes. SHADER_SOURCE_LANGUAGE_HLSL - The shader source is in HLSL. For OpenGL and OpenGLES modes, the source code will be converted to GLSL. SHADER_SOURCE_LANGUAGE_GLSL - The shader source is in GLSL. There is currently no GLSL to HLSL converter, so this value should only be used for OpenGL and OpenGLES modes. There are two ways to provide the shader source code. The first way is to use Source member. The second way is to provide a file path in FilePath member. Since the engine is entirely decoupled from the platform and the host file system is platform-dependent, the structure exposes pShaderSourceStreamFactory member that is intended to provide the engine access to the file system. If FilePath is provided, shader source factory must also be provided. If the shader source contains any #include directives, the source stream factory will also be used to load these files. The engine provides default implementation for every supported platform that should be sufficient in most cases. Custom implementation can be provided when needed.
      When sampling a texture in a shader, the texture sampler was traditionally specified as separate object that was bound to the pipeline at run time or set as part of the texture object itself. However, in most cases it is known beforehand what kind of sampler will be used in the shader. Next-generation APIs expose new type of sampler called static sampler that can be initialized directly in the pipeline state. Diligent Engine exposes this functionality: when creating a shader, textures can be assigned static samplers. If static sampler is assigned, it will always be used instead of the one initialized in the texture shader resource view. To initialize static samplers, prepare an array of StaticSamplerDesc structures and initialize StaticSamplers and NumStaticSamplers members. Static samplers are more efficient and it is highly recommended to use them whenever possible. On older APIs, static samplers are emulated via generic sampler objects.
      The following is an example of shader initialization:
      ShaderCreationAttribs Attrs; Attrs.Desc.Name = "MyPixelShader"; Attrs.FilePath = "MyShaderFile.fx"; Attrs.SearchDirectories = "shaders;shaders\\inc;"; Attrs.EntryPoint = "MyPixelShader"; Attrs.Desc.ShaderType = SHADER_TYPE_PIXEL; Attrs.SourceLanguage = SHADER_SOURCE_LANGUAGE_HLSL; BasicShaderSourceStreamFactory BasicSSSFactory(Attrs.SearchDirectories); Attrs.pShaderSourceStreamFactory = &BasicSSSFactory; ShaderVariableDesc ShaderVars[] = {     {"g_StaticTexture", SHADER_VARIABLE_TYPE_STATIC},     {"g_MutableTexture", SHADER_VARIABLE_TYPE_MUTABLE},     {"g_DynamicTexture", SHADER_VARIABLE_TYPE_DYNAMIC} }; Attrs.Desc.VariableDesc = ShaderVars; Attrs.Desc.NumVariables = _countof(ShaderVars); Attrs.Desc.DefaultVariableType = SHADER_VARIABLE_TYPE_STATIC; StaticSamplerDesc StaticSampler; StaticSampler.Desc.MinFilter = FILTER_TYPE_LINEAR; StaticSampler.Desc.MagFilter = FILTER_TYPE_LINEAR; StaticSampler.Desc.MipFilter = FILTER_TYPE_LINEAR; StaticSampler.TextureName = "g_MutableTexture"; Attrs.Desc.NumStaticSamplers = 1; Attrs.Desc.StaticSamplers = &StaticSampler; ShaderMacroHelper Macros; Macros.AddShaderMacro("USE_SHADOWS", 1); Macros.AddShaderMacro("NUM_SHADOW_SAMPLES", 4); Macros.Finalize(); Attrs.Macros = Macros; RefCntAutoPtr<IShader> pShader; m_pDevice->CreateShader( Attrs, &pShader );
      Creating the Pipeline State Object
      After all required shaders are created, the rest of the fields of the PipelineStateDesc structure provide depth-stencil, rasterizer, and blend state descriptions, the number and format of render targets, input layout format, etc. For instance, rasterizer state can be described as follows:
      PipelineStateDesc PSODesc; RasterizerStateDesc &RasterizerDesc = PSODesc.GraphicsPipeline.RasterizerDesc; RasterizerDesc.FillMode = FILL_MODE_SOLID; RasterizerDesc.CullMode = CULL_MODE_NONE; RasterizerDesc.FrontCounterClockwise = True; RasterizerDesc.ScissorEnable = True; RasterizerDesc.AntialiasedLineEnable = False; Depth-stencil and blend states are defined in a similar fashion.
      Another important thing that pipeline state object encompasses is the input layout description that defines how inputs to the vertex shader, which is the very first shader stage, should be read from the memory. Input layout may define several vertex streams that contain values of different formats and sizes:
      // Define input layout InputLayoutDesc &Layout = PSODesc.GraphicsPipeline.InputLayout; LayoutElement TextLayoutElems[] = {     LayoutElement( 0, 0, 3, VT_FLOAT32, False ),     LayoutElement( 1, 0, 4, VT_UINT8, True ),     LayoutElement( 2, 0, 2, VT_FLOAT32, False ), }; Layout.LayoutElements = TextLayoutElems; Layout.NumElements = _countof( TextLayoutElems ); Finally, pipeline state defines primitive topology type. When all required members are initialized, a pipeline state object can be created by IRenderDevice::CreatePipelineState() method:
      // Define shader and primitive topology PSODesc.GraphicsPipeline.PrimitiveTopologyType = PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE; PSODesc.GraphicsPipeline.pVS = pVertexShader; PSODesc.GraphicsPipeline.pPS = pPixelShader; PSODesc.Name = "My pipeline state"; m_pDev->CreatePipelineState(PSODesc, &m_pPSO); When PSO object is bound to the pipeline, the engine invokes all API-specific commands to set all states specified by the object. In case of Direct3D12 this maps directly to setting the D3D12 PSO object. In case of Direct3D11, this involves setting individual state objects (such as rasterizer and blend states), shaders, input layout etc. In case of OpenGL, this requires a number of fine-grain state tweaking calls. Diligent Engine keeps track of currently bound states and only calls functions to update these states that have actually changed.
      Binding Shader Resources
      Direct3D11 and OpenGL utilize fine-grain resource binding models, where an application binds individual buffers and textures to certain shader or program resource binding slots. Direct3D12 uses a very different approach, where resource descriptors are grouped into tables, and an application can bind all resources in the table at once by setting the table in the command list. Resource binding model in Diligent Engine is designed to leverage this new method. It introduces a new object called shader resource binding that encapsulates all resource bindings required for all shaders in a certain pipeline state. It also introduces the classification of shader variables based on the frequency of expected change that helps the engine group them into tables under the hood:
      Static variables (SHADER_VARIABLE_TYPE_STATIC) are variables that are expected to be set only once. They may not be changed once a resource is bound to the variable. Such variables are intended to hold global constants such as camera attributes or global light attributes constant buffers. Mutable variables (SHADER_VARIABLE_TYPE_MUTABLE) define resources that are expected to change on a per-material frequency. Examples may include diffuse textures, normal maps etc. Dynamic variables (SHADER_VARIABLE_TYPE_DYNAMIC) are expected to change frequently and randomly. Shader variable type must be specified during shader creation by populating an array of ShaderVariableDesc structures and initializing ShaderCreationAttribs::Desc::VariableDesc and ShaderCreationAttribs::Desc::NumVariables members (see example of shader creation above).
      Static variables cannot be changed once a resource is bound to the variable. They are bound directly to the shader object. For instance, a shadow map texture is not expected to change after it is created, so it can be bound directly to the shader:
      PixelShader->GetShaderVariable( "g_tex2DShadowMap" )->Set( pShadowMapSRV ); Mutable and dynamic variables are bound via a new Shader Resource Binding object (SRB) that is created by the pipeline state (IPipelineState::CreateShaderResourceBinding()):
      m_pPSO->CreateShaderResourceBinding(&m_pSRB); Note that an SRB is only compatible with the pipeline state it was created from. SRB object inherits all static bindings from shaders in the pipeline, but is not allowed to change them.
      Mutable resources can only be set once for every instance of a shader resource binding. Such resources are intended to define specific material properties. For instance, a diffuse texture for a specific material is not expected to change once the material is defined and can be set right after the SRB object has been created:
      m_pSRB->GetVariable(SHADER_TYPE_PIXEL, "tex2DDiffuse")->Set(pDiffuseTexSRV); In some cases it is necessary to bind a new resource to a variable every time a draw command is invoked. Such variables should be labeled as dynamic, which will allow setting them multiple times through the same SRB object:
      m_pSRB->GetVariable(SHADER_TYPE_VERTEX, "cbRandomAttribs")->Set(pRandomAttrsCB); Under the hood, the engine pre-allocates descriptor tables for static and mutable resources when an SRB objcet is created. Space for dynamic resources is dynamically allocated at run time. Static and mutable resources are thus more efficient and should be used whenever possible.
      As you can see, Diligent Engine does not expose low-level details of how resources are bound to shader variables. One reason for this is that these details are very different for various APIs. The other reason is that using low-level binding methods is extremely error-prone: it is very easy to forget to bind some resource, or bind incorrect resource such as bind a buffer to the variable that is in fact a texture, especially during shader development when everything changes fast. Diligent Engine instead relies on shader reflection system to automatically query the list of all shader variables. Grouping variables based on three types mentioned above allows the engine to create optimized layout and take heavy lifting of matching resources to API-specific resource location, register or descriptor in the table.
      This post gives more details about the resource binding model in Diligent Engine.
      Setting the Pipeline State and Committing Shader Resources
      Before any draw or compute command can be invoked, the pipeline state needs to be bound to the context:
      m_pContext->SetPipelineState(m_pPSO); Under the hood, the engine sets the internal PSO object in the command list or calls all the required native API functions to properly configure all pipeline stages.
      The next step is to bind all required shader resources to the GPU pipeline, which is accomplished by IDeviceContext::CommitShaderResources() method:
      m_pContext->CommitShaderResources(m_pSRB, COMMIT_SHADER_RESOURCES_FLAG_TRANSITION_RESOURCES); The method takes a pointer to the shader resource binding object and makes all resources the object holds available for the shaders. In the case of D3D12, this only requires setting appropriate descriptor tables in the command list. For older APIs, this typically requires setting all resources individually.
      Next-generation APIs require the application to track the state of every resource and explicitly inform the system about all state transitions. For instance, if a texture was used as render target before, while the next draw command is going to use it as shader resource, a transition barrier needs to be executed. Diligent Engine does the heavy lifting of state tracking.  When CommitShaderResources() method is called with COMMIT_SHADER_RESOURCES_FLAG_TRANSITION_RESOURCES flag, the engine commits and transitions resources to correct states at the same time. Note that transitioning resources does introduce some overhead. The engine tracks state of every resource and it will not issue the barrier if the state is already correct. But checking resource state is an overhead that can sometimes be avoided. The engine provides IDeviceContext::TransitionShaderResources() method that only transitions resources:
      m_pContext->TransitionShaderResources(m_pPSO, m_pSRB); In some scenarios it is more efficient to transition resources once and then only commit them.
      Invoking Draw Command
      The final step is to set states that are not part of the PSO, such as render targets, vertex and index buffers. Diligent Engine uses Direct3D11-syle API that is translated to other native API calls under the hood:
      ITextureView *pRTVs[] = {m_pRTV}; m_pContext->SetRenderTargets(_countof( pRTVs ), pRTVs, m_pDSV); // Clear render target and depth buffer const float zero[4] = {0, 0, 0, 0}; m_pContext->ClearRenderTarget(nullptr, zero); m_pContext->ClearDepthStencil(nullptr, CLEAR_DEPTH_FLAG, 1.f); // Set vertex and index buffers IBuffer *buffer[] = {m_pVertexBuffer}; Uint32 offsets[] = {0}; Uint32 strides[] = {sizeof(MyVertex)}; m_pContext->SetVertexBuffers(0, 1, buffer, strides, offsets, SET_VERTEX_BUFFERS_FLAG_RESET); m_pContext->SetIndexBuffer(m_pIndexBuffer, 0); Different native APIs use various set of function to execute draw commands depending on command details (if the command is indexed, instanced or both, what offsets in the source buffers are used etc.). For instance, there are 5 draw commands in Direct3D11 and more than 9 commands in OpenGL with something like glDrawElementsInstancedBaseVertexBaseInstance not uncommon. Diligent Engine hides all details with single IDeviceContext::Draw() method that takes takes DrawAttribs structure as an argument. The structure members define all attributes required to perform the command (primitive topology, number of vertices or indices, if draw call is indexed or not, if draw call is instanced or not, if draw call is indirect or not, etc.). For example:
      DrawAttribs attrs; attrs.IsIndexed = true; attrs.IndexType = VT_UINT16; attrs.NumIndices = 36; attrs.Topology = PRIMITIVE_TOPOLOGY_TRIANGLE_LIST; pContext->Draw(attrs); For compute commands, there is IDeviceContext::DispatchCompute() method that takes DispatchComputeAttribs structure that defines compute grid dimension.
      Source Code
      Full engine source code is available on GitHub and is free to use. The repository contains two samples, asteroids performance benchmark and example Unity project that uses Diligent Engine in native plugin.
      AntTweakBar sample is Diligent Engine’s “Hello World” example.

       
      Atmospheric scattering sample is a more advanced example. It demonstrates how Diligent Engine can be used to implement various rendering tasks: loading textures from files, using complex shaders, rendering to multiple render targets, using compute shaders and unordered access views, etc.

      Asteroids performance benchmark is based on this demo developed by Intel. It renders 50,000 unique textured asteroids and allows comparing performance of Direct3D11 and Direct3D12 implementations. Every asteroid is a combination of one of 1000 unique meshes and one of 10 unique textures.

      Finally, there is an example project that shows how Diligent Engine can be integrated with Unity.

      Future Work
      The engine is under active development. It currently supports Windows desktop, Universal Windows and Android platforms. Direct3D11, Direct3D12, OpenGL/GLES backends are now feature complete. Vulkan backend is coming next, and support for more platforms is planned.
    • By reenigne
      For those that don't know me. I am the individual who's two videos are listed here under setup for https://wiki.libsdl.org/Tutorials
      I also run grhmedia.com where I host the projects and code for the tutorials I have online.
      Recently, I received a notice from youtube they will be implementing their new policy in protecting video content as of which I won't be monetized till I meat there required number of viewers and views each month.

      Frankly, I'm pretty sick of youtube. I put up a video and someone else learns from it and puts up another video and because of the way youtube does their placement they end up with more views.
      Even guys that clearly post false information such as one individual who said GLEW 2.0 was broken because he didn't know how to compile it. He in short didn't know how to modify the script he used because he didn't understand make files and how the requirements of the compiler and library changes needed some different flags.

      At the end of the month when they implement this I will take down the content and host on my own server purely and it will be a paid system and or patreon. 

      I get my videos may be a bit dry, I generally figure people are there to learn how to do something and I rather not waste their time. 
      I used to also help people for free even those coming from the other videos. That won't be the case any more. I used to just take anyone emails and work with them my email is posted on the site.

      I don't expect to get the required number of subscribers in that time or increased views. Even if I did well it wouldn't take care of each reoccurring month.
      I figure this is simpler and I don't plan on putting some sort of exorbitant fee for a monthly subscription or the like.
      I was thinking on the lines of a few dollars 1,2, and 3 and the larger subscription gets you assistance with the content in the tutorials if needed that month.
      Maybe another fee if it is related but not directly in the content. 
      The fees would serve to cut down on the number of people who ask for help and maybe encourage some of the people to actually pay attention to what is said rather than do their own thing. That actually turns out to be 90% of the issues. I spent 6 hours helping one individual last week I must have asked him 20 times did you do exactly like I said in the video even pointed directly to the section. When he finally sent me a copy of the what he entered I knew then and there he had not. I circled it and I pointed out that wasn't what I said to do in the video. I didn't tell him what was wrong and how I knew that way he would go back and actually follow what it said to do. He then reported it worked. Yea, no kidding following directions works. But hey isn't alone and well its part of the learning process.

      So the point of this isn't to be a gripe session. I'm just looking for a bit of feed back. Do you think the fees are unreasonable?
      Should I keep the youtube channel and do just the fees with patreon or do you think locking the content to my site and require a subscription is an idea.

      I'm just looking at the fact it is unrealistic to think youtube/google will actually get stuff right or that youtube viewers will actually bother to start looking for more accurate videos. 
    • By Balma Alparisi
      i got error 1282 in my code.
      sf::ContextSettings settings; settings.majorVersion = 4; settings.minorVersion = 5; settings.attributeFlags = settings.Core; sf::Window window; window.create(sf::VideoMode(1600, 900), "Texture Unit Rectangle", sf::Style::Close, settings); window.setActive(true); window.setVerticalSyncEnabled(true); glewInit(); GLuint shaderProgram = createShaderProgram("FX/Rectangle.vss", "FX/Rectangle.fss"); float vertex[] = { -0.5f,0.5f,0.0f, 0.0f,0.0f, -0.5f,-0.5f,0.0f, 0.0f,1.0f, 0.5f,0.5f,0.0f, 1.0f,0.0f, 0.5,-0.5f,0.0f, 1.0f,1.0f, }; GLuint indices[] = { 0,1,2, 1,2,3, }; GLuint vao; glGenVertexArrays(1, &vao); glBindVertexArray(vao); GLuint vbo; glGenBuffers(1, &vbo); glBindBuffer(GL_ARRAY_BUFFER, vbo); glBufferData(GL_ARRAY_BUFFER, sizeof(vertex), vertex, GL_STATIC_DRAW); GLuint ebo; glGenBuffers(1, &ebo); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,GL_STATIC_DRAW); glVertexAttribPointer(0, 3, GL_FLOAT, false, sizeof(float) * 5, (void*)0); glEnableVertexAttribArray(0); glVertexAttribPointer(1, 2, GL_FLOAT, false, sizeof(float) * 5, (void*)(sizeof(float) * 3)); glEnableVertexAttribArray(1); GLuint texture[2]; glGenTextures(2, texture); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture[0]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); sf::Image* imageOne = new sf::Image; bool isImageOneLoaded = imageOne->loadFromFile("Texture/container.jpg"); if (isImageOneLoaded) { glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageOne->getSize().x, imageOne->getSize().y, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageOne->getPixelsPtr()); glGenerateMipmap(GL_TEXTURE_2D); } delete imageOne; glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, texture[1]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); sf::Image* imageTwo = new sf::Image; bool isImageTwoLoaded = imageTwo->loadFromFile("Texture/awesomeface.png"); if (isImageTwoLoaded) { glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageTwo->getSize().x, imageTwo->getSize().y, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageTwo->getPixelsPtr()); glGenerateMipmap(GL_TEXTURE_2D); } delete imageTwo; glUniform1i(glGetUniformLocation(shaderProgram, "inTextureOne"), 0); glUniform1i(glGetUniformLocation(shaderProgram, "inTextureTwo"), 1); GLenum error = glGetError(); std::cout << error << std::endl; sf::Event event; bool isRunning = true; while (isRunning) { while (window.pollEvent(event)) { if (event.type == event.Closed) { isRunning = false; } } glClear(GL_COLOR_BUFFER_BIT); if (isImageOneLoaded && isImageTwoLoaded) { glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture[0]); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, texture[1]); glUseProgram(shaderProgram); } glBindVertexArray(vao); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr); glBindVertexArray(0); window.display(); } glDeleteVertexArrays(1, &vao); glDeleteBuffers(1, &vbo); glDeleteBuffers(1, &ebo); glDeleteProgram(shaderProgram); glDeleteTextures(2,texture); return 0; } and this is the vertex shader
      #version 450 core layout(location=0) in vec3 inPos; layout(location=1) in vec2 inTexCoord; out vec2 TexCoord; void main() { gl_Position=vec4(inPos,1.0); TexCoord=inTexCoord; } and the fragment shader
      #version 450 core in vec2 TexCoord; uniform sampler2D inTextureOne; uniform sampler2D inTextureTwo; out vec4 FragmentColor; void main() { FragmentColor=mix(texture(inTextureOne,TexCoord),texture(inTextureTwo,TexCoord),0.2); } I was expecting awesomeface.png on top of container.jpg

    • By khawk
      We've just released all of the source code for the NeHe OpenGL lessons on our Github page at https://github.com/gamedev-net/nehe-opengl. code - 43 total platforms, configurations, and languages are included.
      Now operated by GameDev.net, NeHe is located at http://nehe.gamedev.net where it has been a valuable resource for developers wanting to learn OpenGL and graphics programming.

      View full story
    • By TheChubu
      The Khronos™ Group, an open consortium of leading hardware and software companies, announces from the SIGGRAPH 2017 Conference the immediate public availability of the OpenGL® 4.6 specification. OpenGL 4.6 integrates the functionality of numerous ARB and EXT extensions created by Khronos members AMD, Intel, and NVIDIA into core, including the capability to ingest SPIR-V™ shaders.
      SPIR-V is a Khronos-defined standard intermediate language for parallel compute and graphics, which enables content creators to simplify their shader authoring and management pipelines while providing significant source shading language flexibility. OpenGL 4.6 adds support for ingesting SPIR-V shaders to the core specification, guaranteeing that SPIR-V shaders will be widely supported by OpenGL implementations.
      OpenGL 4.6 adds the functionality of these ARB extensions to OpenGL’s core specification:
      GL_ARB_gl_spirv and GL_ARB_spirv_extensions to standardize SPIR-V support for OpenGL GL_ARB_indirect_parameters and GL_ARB_shader_draw_parameters for reducing the CPU overhead associated with rendering batches of geometry GL_ARB_pipeline_statistics_query and GL_ARB_transform_feedback_overflow_querystandardize OpenGL support for features available in Direct3D GL_ARB_texture_filter_anisotropic (based on GL_EXT_texture_filter_anisotropic) brings previously IP encumbered functionality into OpenGL to improve the visual quality of textured scenes GL_ARB_polygon_offset_clamp (based on GL_EXT_polygon_offset_clamp) suppresses a common visual artifact known as a “light leak” associated with rendering shadows GL_ARB_shader_atomic_counter_ops and GL_ARB_shader_group_vote add shader intrinsics supported by all desktop vendors to improve functionality and performance GL_KHR_no_error reduces driver overhead by allowing the application to indicate that it expects error-free operation so errors need not be generated In addition to the above features being added to OpenGL 4.6, the following are being released as extensions:
      GL_KHR_parallel_shader_compile allows applications to launch multiple shader compile threads to improve shader compile throughput WGL_ARB_create_context_no_error and GXL_ARB_create_context_no_error allow no error contexts to be created with WGL or GLX that support the GL_KHR_no_error extension “I’m proud to announce OpenGL 4.6 as the most feature-rich version of OpenGL yet. We've brought together the most popular, widely-supported extensions into a new core specification to give OpenGL developers and end users an improved baseline feature set. This includes resolving previous intellectual property roadblocks to bringing anisotropic texture filtering and polygon offset clamping into the core specification to enable widespread implementation and usage,” said Piers Daniell, chair of the OpenGL Working Group at Khronos. “The OpenGL working group will continue to respond to market needs and work with GPU vendors to ensure OpenGL remains a viable and evolving graphics API for all its customers and users across many vital industries.“
      The OpenGL 4.6 specification can be found at https://khronos.org/registry/OpenGL/index_gl.php. The GLSL to SPIR-V compiler glslang has been updated with GLSL 4.60 support, and can be found at https://github.com/KhronosGroup/glslang.
      Sophisticated graphics applications will also benefit from a set of newly released extensions for both OpenGL and OpenGL ES to enable interoperability with Vulkan and Direct3D. These extensions are named:
      GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_memory_object_win32 GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_semaphore_win32 GL_EXT_win32_keyed_mutex They can be found at: https://khronos.org/registry/OpenGL/index_gl.php
      Industry Support for OpenGL 4.6
      “With OpenGL 4.6 our customers have an improved set of core features available on our full range of OpenGL 4.x capable GPUs. These features provide improved rendering quality, performance and functionality. As the graphics industry’s most popular API, we fully support OpenGL and will continue to work closely with the Khronos Group on the development of new OpenGL specifications and extensions for our customers. NVIDIA has released beta OpenGL 4.6 drivers today at https://developer.nvidia.com/opengl-driver so developers can use these new features right away,” said Bob Pette, vice president, Professional Graphics at NVIDIA.
      "OpenGL 4.6 will be the first OpenGL release where conformant open source implementations based on the Mesa project will be deliverable in a reasonable timeframe after release. The open sourcing of the OpenGL conformance test suite and ongoing work between Khronos and X.org will also allow for non-vendor led open source implementations to achieve conformance in the near future," said David Airlie, senior principal engineer at Red Hat, and developer on Mesa/X.org projects.

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