I was going to add this as a reply to another post but they seem to have a different problem.
I am having problems getting my head around how the lighting works in HLSL fullstop. When using lights in the program it is simple. Set position, direction and colors and use it .. but in the HLSL fx file it seems there is a lot more involved. I took a look at both the BasicHLSL and DHPOWARE light demos but neither really helped to clear up the whys and hows of the excess of commands.
Before I post up the code I am currently using the main question I am asking is ..
Is there a SIMPLE HLSL book out there that I haven't stumbled across yet that someone can point out?
edit:
Just found this book
2 Books At Amazon that might be what I need. Anyone have them and can confirm they are at least partially useful ? Thanks.
I've tried google but nothing as simple appears and my Shader books are currently too advanced for me and also doesn't show anything simple in HLSL language for me to try out.
Okay, onto my source code for those that want to see it.
Here's the fx file I have set up using the BasicHLSL as a guide.
// Matrices
float4x4 world; // world matrix
float4x4 worldviewprojection; // everything
// Lighting
float3 LightDir; // Light's direction in world space
float4 LightDiffuse; // Light's diffuse color
float4 LightAmbient; // Light's ambient color
// Materials
float4 MaterialAmbientColor; // Material's ambient color
float4 MaterialDiffuseColor; // Material's diffuse color
// Textures
texture t0;
sampler t0Sampler =
sampler_state { Texture = <t0>; MipFilter = LINEAR; MinFilter = LINEAR; MagFilter = LINEAR; };
// Structs
struct VS_OUTPUT
{
float4 Position : POSITION; // vertex position
float4 Diffuse : COLOR0; // vertex diffuse color
float2 TextureUV : TEXCOORD0; // vertex texture coords
};
struct PS_OUTPUT
{
float4 RGBColor : COLOR0; // Pixel color
};
// Shaders
VS_OUTPUT VSMesh( float4 vPos : POSITION, float3 vNormal : NORMAL, float2 vTexCoord0 : TEXCOORD0)
{
VS_OUTPUT Output;
float3 vNormalWorldSpace;
// Transform the position from object space to homogeneous projection space
Output.Position = mul(vPos, worldviewprojection);
// Transform the normal from object space to world space
vNormalWorldSpace = normalize(mul(vNormal, (float3x3)world)); // normal (world space)
// Compute simple directional lighting equation
float3 vTotalLightDiffuse = float3(0,0,0);
vTotalLightDiffuse += LightDiffuse * max(0,dot(vNormalWorldSpace, LightDir));
Output.Diffuse.rgb = MaterialDiffuseColor * vTotalLightDiffuse +
MaterialAmbientColor * LightAmbient;
Output.Diffuse.a = 1.0f;
Output.TextureUV = vTexCoord0;
return Output;
}
PS_OUTPUT PSMesh( VS_OUTPUT In)
{
PS_OUTPUT Output;
Output.RGBColor = tex2D(t0Sampler, In.TextureUV) * In.Diffuse;
return Output;
}
// Techniques
technique MeshShader
{
pass p0
{
VertexShader = compile vs_2_0 VSMesh();
PixelShader = compile ps_2_0 PSMesh();
}
}
And this is my Mesh Drawing Routine:
bool bUseEffect = true;
int effectID = 1;
if (bUseEffect)
{
gEffect[effectID]->SetTechnique("MeshShader");
gEffect[effectID]->SetTextureValue("t0",gTexture[0]->Retrieve());
gEffect[effectID]->Retrieve()->SetValue("LightDir",&(gDirectX->Light().Direction),sizeof(D3DVECTOR));
gEffect[effectID]->Retrieve()->SetValue("LightDiffuse",&(gDirectX->Light().Diffuse),sizeof(D3DCOLORVALUE));
gEffect[effectID]->Retrieve()->SetValue("LightAmbient",&(gDirectX->Light().Ambient),sizeof(D3DCOLORVALUE));
gEffect[effectID]->Retrieve()->SetValue("MaterialDiffuse",&(gDirectX->Material().Diffuse),sizeof(D3DCOLORVALUE));
gEffect[effectID]->Retrieve()->SetValue("MaterialAmbient",&(gDirectX->Material().Ambient),sizeof(D3DCOLORVALUE));
}
else
{
gTexture[0]->Use(0,TRUE);
gDirectX->EnableLight(0,TRUE);
gDirectX->UseMaterial(TRUE);
}
gDirectX->PositionObject(D3DXVECTOR3(2.0f,-2.0f,5.0f));
if (bUseEffect)
{
gEffect[effectID]->SetMatrixValue("world",&(gDirectX->World()));
gEffect[effectID]->SetMatrixValue("worldviewprojection",&(gDirectX->WorldViewProjection()));
passes = gEffect[effectID]->Begin();
for (int i = 0; i < passes; i++)
{
gEffect[effectID]->BeginPass(i);
gTeapot->DrawSubset(0);
gEffect[effectID]->EndPass();
}
gEffect[effectID]->End();
}
else
{
gTeapot->DrawSubset(0);
}
gDirectX->PositionObject(D3DXVECTOR3(-2.0f,-2.0f,5.0f));
if (bUseEffect)
{
gEffect[effectID]->SetMatrixValue("world",&(gDirectX->World()));
gEffect[effectID]->SetMatrixValue("worldviewprojection",&(gDirectX->WorldViewProjection()));
passes = gEffect[effectID]->Begin();
for (int i = 0; i < passes; i++)
{
gEffect[effectID]->BeginPass(i);
gCube->DrawSubset(0);
gEffect[effectID]->EndPass();
}
gEffect[effectID]->End();
}
else
{
gCube->DrawSubset(0);
}
gDirectX->PositionObject(D3DXVECTOR3(2.0f,2.0f,5.0f));
if (bUseEffect)
{
gEffect[effectID]->SetMatrixValue("world",&(gDirectX->World()));
gEffect[effectID]->SetMatrixValue("worldviewprojection",&(gDirectX->WorldViewProjection()));
passes = gEffect[effectID]->Begin();
for (int i = 0; i < passes; i++)
{
gEffect[effectID]->BeginPass(i);
gSphere->DrawSubset(0);
gEffect[effectID]->EndPass();
}
gEffect[effectID]->End();
}
else
{
gSphere->DrawSubset(0);
}
gDirectX->PositionObject(D3DXVECTOR3(-2.0f,2.0f,5.0f));
if (bUseEffect)
{
gEffect[effectID]->SetMatrixValue("world",&(gDirectX->World()));
gEffect[effectID]->SetMatrixValue("worldviewprojection",&(gDirectX->WorldViewProjection()));
passes = gEffect[effectID]->Begin();
for (int i = 0; i < passes; i++)
{
gEffect[effectID]->BeginPass(i);
gTorus->DrawSubset(0);
gEffect[effectID]->EndPass();
}
gEffect[effectID]->End();
}
else
{
gTorus->DrawSubset(0);
}
The positioning of the objects while using the effect file is perfect but they are being drawn black which seems to signify a sign of the lighting not working properly.
All the global effect file values are being set to values the program uses to draw when not using the effect file so I can't see what is wrong unless the fx file itself is wrong or that I need to set more lighting values but no other lighting values are actually being used in the fx file.
I'll have to investigate further but this is about the simplest lighting fx file I could find and if I can't get this working then I'll never get anything more complex working let alone understood.
Thanks for any replies and for reading this loooong post.
