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Project Rembrandt: Difference between revisions
→Geometry Stage
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=== Geometry Stage === | === Geometry Stage === | ||
The Geometry Stage is there to fill the G-buffer. Shading doesn't occur at this stage, so light or fog computation should not be part of the shader. The required operation in the Fragment Shader is to fill every individual buffer with sensible value : | The Geometry Stage is there to fill the G-buffer. '''Shading doesn't occur at this stage, so light or fog computation should not be part of the shader'''. The required operation in the Fragment Shader is to fill every individual buffer with sensible value : | ||
{| class="wikitable" style="text-align: center;" | |||
|depth (gl_FragDepth)||GL_DEPTH_COMPONENT32||colspan="4"|Fragment depth | |||
|- | |||
|gl_FragData[0]||GL_RG16||colspan="2"|normal.x * 0.5 + 0.5||colspan="2"|normal.y * 0.5 + 0.5 | |||
|- | |||
|gl_FragData[1]||GL_RGBA8||diffuse.r||diffuse.g||diffuse.b||material id * 1/255.0 | |||
|- | |||
|gl_FragData[2]||GL_RGBA8||specular.l||specular.s||emission.l||pixel valid if != 0 | |||
|} | |||
This is the default layout expected by the sunlight shader. material Id can be used to detect a different layout | |||
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#Depth buffer, modified with gl_FragDepth, will record the distance between the fragment and the camera. Default behavior is to avoid to touch it, living the GPU rasterizer doing sensible things by interpolating vertex gl_Position from the Vertex or the Geometry Shader. If altering the computed depth is required, like in the Urban shader, the value of gl_FragDepth should be set. | #Depth buffer, modified with gl_FragDepth, will record the distance between the fragment and the camera. Default behavior is to avoid to touch it, living the GPU rasterizer doing sensible things by interpolating vertex gl_Position from the Vertex or the Geometry Shader. If altering the computed depth is required, like in the Urban shader, the value of gl_FragDepth should be set. | ||
#Normal buffer, modified with gl_FragData[0].xyz, will record the normal of the fragment in eye coordinates. gl_FragData[0].w is reserved for future use. The interpolated normal is usually simply stored but bump mapping or relief mapping affecting the normal can be computed here. | #Normal buffer, modified with gl_FragData[0].xyz, will record the normal of the fragment in eye coordinates. gl_FragData[0].w is reserved for future use. The interpolated normal is usually simply stored but bump mapping or relief mapping affecting the normal can be computed here. | ||
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<span style="color:red;font-size:1.5em;font-weight:bold">This layout is going to change in the official repository when the merge will be done. The goal of this change is to fill more useful data into less texture memory and get rid of a stupid IP issue on float textures</span> | <span style="color:red;font-size:1.5em;font-weight:bold">This layout is going to change in the official repository when the merge will be done. The goal of this change is to fill more useful data into less texture memory and get rid of a stupid IP issue on float textures</span> | ||
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=== Additional light pass === | === Additional light pass === | ||