• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0

A sampled float value in a Texture2D is unexpectedly 1.0 higher.

2 posts in this topic

Hi, I'm rendering to a Texture2D via a pixelshader and everything is working correctly.
The input.depth value being returned from it is 0.045904520.

Texture2D DepthMap : register(t0);
SamplerState DepthMapSampler : register(s0);

float4 txDepthMapPixelShader(in PixelShaderInput_DepthMap input) : SV_TARGET
  return float4(input.depth, 0, 0, 0); <-- 0.045904520

When I sample the texture in another pixel shader the depth value has changed to 1.045904520; becoming 1.0 higher.

float4 txPixelShader(in PixelShaderInput input) : SV_TARGET
    float2 depthTexCoords = 0.5 * input.vertexPosition2.xy / input.vertexPosition2.w + float2(0.5, 0.5);
    depthTexCoords.y = 1.0f - depthTexCoords.y; // Inverse - good for debugging.

    float depth = DepthMap.Sample(DepthMapSampler, depthTexCoords.xy).r; <-- 1.045904520

Now I can delete this value by 1.0 to get the effect I desire so it's not really a problem; but I'm curious as to where this additional 1.0 has originated from?
Has anyone got any ideas?  Thank you in advance.

The data structures I use are as follows.

D3D11_TEXTURE2D_DESC depthTextureDesc;
::ZeroMemory(&depthTextureDesc, sizeof(D3D11_TEXTURE2D_DESC));
depthTextureDesc.Width = _windowWidth;
depthTextureDesc.Height = _windowHeight;
depthTextureDesc.MipLevels = 1;
depthTextureDesc.ArraySize = 1;
depthTextureDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
depthTextureDesc.SampleDesc.Count = 1;
depthTextureDesc.Usage = D3D11_USAGE_DEFAULT;
depthTextureDesc.CPUAccessFlags = 0;
depthTextureDesc.MiscFlags = 0;

hr = _device->CreateTexture2D(&depthTextureDesc, NULL, &_depthDepthStencil);

D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;
::ZeroMemory(&shaderResourceViewDesc, sizeof(D3D11_SHADER_RESOURCE_VIEW_DESC));
shaderResourceViewDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
shaderResourceViewDesc.Texture2D.MipLevels = 1;

hr = _device->CreateShaderResourceView(_depthDepthStencil, &shaderResourceViewDesc, &_depthResourceView);

D3D11_RENDER_TARGET_VIEW_DESC depthTargetViewDesc;
::ZeroMemory(&depthTargetViewDesc, sizeof(D3D11_RENDER_TARGET_VIEW_DESC));
depthTargetViewDesc.Format = shaderResourceViewDesc.Format;
depthTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
depthTargetViewDesc.Texture2D.MipSlice = 0;

hr = _device->CreateRenderTargetView(_depthDepthStencil, &depthTargetViewDesc, &_depthRenderTargetView);

D3D11_RASTERIZER_DESC depthRenderStateDesc;
::ZeroMemory(&depthRenderStateDesc, sizeof(D3D11_RASTERIZER_DESC));
depthRenderStateDesc.CullMode = D3D11_CULL_FRONT;
depthRenderStateDesc.FillMode = D3D11_FILL_SOLID;
depthRenderStateDesc.DepthClipEnable = true;

hr = _device->CreateRasterizerState(&depthRenderStateDesc, &_depthRasterState);


Edited by collie

Share this post

Link to post
Share on other sites

Do you have any blend state enabled?  For example, even if you output a depth value, the Output Merger can still modify the value before it gets written to a render target.  Can you double check that the blending is disabled?


Share this post

Link to post
Share on other sites

Hi Jason,  Thank you for the reply.

Yes I believe blending was off..


D3D11_BLEND_DESC desc;
::ZeroMemory(&desc, sizeof(D3D11_BLEND_DESC));
desc.RenderTarget[0].BlendEnable = FALSE;





Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
Followers 0