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tutorial_203_20-_20shaders_20and_20effect_20system
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tutorial_203_20-_20shaders_20and_20effect_20system [2018/04/13 22:33] richardrussell Added syntax highlighting |
tutorial_203_20-_20shaders_20and_20effect_20system [2018/04/17 19:09] (current) tbest3112 Added syntax highlighting for HLSL (useing glsl as close enough) |
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| ===== Vertex Shaders ===== | ===== Vertex Shaders ===== | ||
| \\ Vertex shaders are short programs that are executed by the GPU on vertices. Think of vertex shaders as C functions that take each vertex as input, process the input, and then output the modified vertex. In the Direct3D 11 tutorials, we will write our shaders in High-Level Shading Language (HLSL). Recall that our vertex data has a 3D position element, and the vertex shader will do no processing on the input at all. The resulting vertex shader looks like the following:\\ \\ | \\ Vertex shaders are short programs that are executed by the GPU on vertices. Think of vertex shaders as C functions that take each vertex as input, process the input, and then output the modified vertex. In the Direct3D 11 tutorials, we will write our shaders in High-Level Shading Language (HLSL). Recall that our vertex data has a 3D position element, and the vertex shader will do no processing on the input at all. The resulting vertex shader looks like the following:\\ \\ | ||
| + | <code glsl> | ||
| float4 VS( float4 Pos : POSITION ) : SV_POSITION | float4 VS( float4 Pos : POSITION ) : SV_POSITION | ||
| { | { | ||
| return Pos; | return Pos; | ||
| } | } | ||
| + | </code> | ||
| \\ | \\ | ||
| ===== Pixel Shaders ===== | ===== Pixel Shaders ===== | ||
| \\ A pixel shader's primary purpose is to compute the colour that each pixel should have. The shader takes certain input about the pixel being coloured, computes the pixel's colour, then outputs that colour back to the pipeline. The vertex shader we created above outputs a float4 with the semantics SV_POSITION. This will be the input of our pixel shader. Since pixel shaders output color values, the output of our pixel shader will be a float4. We give the output the semantics SV_TARGET to signify outputting to the render target format. The pixel shader looks like the following:\\ \\ | \\ A pixel shader's primary purpose is to compute the colour that each pixel should have. The shader takes certain input about the pixel being coloured, computes the pixel's colour, then outputs that colour back to the pipeline. The vertex shader we created above outputs a float4 with the semantics SV_POSITION. This will be the input of our pixel shader. Since pixel shaders output color values, the output of our pixel shader will be a float4. We give the output the semantics SV_TARGET to signify outputting to the render target format. The pixel shader looks like the following:\\ \\ | ||
| + | <code glsl> | ||
| float4 PS( float4 Pos : SV_POSITION ) : SV_Target | float4 PS( float4 Pos : SV_POSITION ) : SV_Target | ||
| { | { | ||
| return float4( 1.0f, 1.0f, 0.0f, 1.0f ); // Yellow, with Alpha = 1 | return float4( 1.0f, 1.0f, 0.0f, 1.0f ); // Yellow, with Alpha = 1 | ||
| } | } | ||
| + | </code> | ||
| \\ | \\ | ||
| ===== Creating the Shaders ===== | ===== Creating the Shaders ===== | ||
tutorial_203_20-_20shaders_20and_20effect_20system.1523658792.txt.gz ยท Last modified: 2018/04/13 22:33 by richardrussell
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