7278e5b5ba
* Use a clip space that matches our screen space for the z axis We now set the projection matrix so that the clip space for the z axis follows the inverted DX convention, i.e.: z_clip between 1 (near) and 0 (far), which matches our screen space. Note that the actual clip space in the GPU can revert to the "inverted GL convention", i.e.: z_clip between -1 and 1, if the clip_control extension is not present. In that case the precision benefits are mostly lost. Also note that there shouldn't be any user facing changes. The projection matrix at the API level, still follows the GL convention. Also, currently, the VERTEX_DOMAIN_DEVICE for materials also keeps the GL convention (this is corrected in the vertex shader). The gist of this change is to move the "reversed DX" mapping from the vertex shader to the projection matrix. * Update shaders/src/getters.vs Co-authored-by: Ben Doherty <bendoherty@google.com> Co-authored-by: Ben Doherty <bendoherty@google.com>
44 lines
1.5 KiB
GLSL
44 lines
1.5 KiB
GLSL
void main() {
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// Initialize the vertex shader inputs to sensible default values.
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PostProcessVertexInputs inputs;
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initPostProcessMaterialVertex(inputs);
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inputs.normalizedUV = position.xy * 0.5 + 0.5;
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inputs.texelCoords = inputs.normalizedUV * frameUniforms.resolution.xy;
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// In Vulkan and Metal, texture coords are Y-down. In OpenGL, texture coords are Y-up.
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#if defined(TARGET_METAL_ENVIRONMENT) || defined(TARGET_VULKAN_ENVIRONMENT)
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inputs.texelCoords.y = frameUniforms.resolution.y - inputs.texelCoords.y;
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inputs.normalizedUV.y = 1.0 - inputs.normalizedUV.y;
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#endif
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gl_Position = getPosition();
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// GL convention to inverted DX convention
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gl_Position.z = gl_Position.z * -0.5 + 0.5;
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// Adjust clip-space
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#if !defined(TARGET_VULKAN_ENVIRONMENT) && !defined(TARGET_METAL_ENVIRONMENT)
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// This is not needed in Vulkan or Metal because clipControl is always (1, 0)
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gl_Position.z = dot(gl_Position.zw, frameUniforms.clipControl);
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#endif
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// Invoke user code
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postProcessVertex(inputs);
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vertex_uv = inputs.texelCoords;
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// Handle user-defined interpolated attributes
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#if defined(VARIABLE_CUSTOM0)
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VARIABLE_CUSTOM_AT0 = inputs.VARIABLE_CUSTOM0;
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#endif
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#if defined(VARIABLE_CUSTOM1)
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VARIABLE_CUSTOM_AT1 = inputs.VARIABLE_CUSTOM1;
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#endif
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#if defined(VARIABLE_CUSTOM2)
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VARIABLE_CUSTOM_AT2 = inputs.VARIABLE_CUSTOM2;
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#endif
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#if defined(VARIABLE_CUSTOM3)
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VARIABLE_CUSTOM_AT3 = inputs.VARIABLE_CUSTOM3;
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#endif
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}
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