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== Description ==
== Description ==
The PICA200 is an opengl ES 1.1 compliant GPU manufactured by DMP. It comes loaded with a number of extensions that make it similar to an openGL ES 2.0 compliant GPU (ability to run programmable vertex/geometry shaders, for instance). Because of this, Nintendo wrapped GPU access into an openGL ES 2.0 implementation with some limitations. As the fragment stage of the pipeline is non-programmable, Nintendo instead gives developers the ability to configure a number of fragment-related values through glGetUniformLocation and glSetUniform. See below for the full list.
The PICA200 is an opengl ES 1.1 compliant GPU manufactured by DMP. It comes loaded with a number of extensions that make it similar to an openGL ES 2.0 compliant GPU (ability to run programmable vertex/geometry shaders, for instance). Because of this, Nintendo wrapped GPU access into an openGL ES 2.0 implementation with some limitations. As the fragment stage of the pipeline is non-programmable, Nintendo instead gives developers the ability to configure a number of fragment-related values through glGetUniformLocation and glUniformXX. See below for the full list.
== Shader program structure ==
== Shader program structure ==
| dmp_FragmentLightSource[k].distanceAttenuationScale (float)
| dmp_FragmentLightSource[k].distanceAttenuationScale (float)
|}
|}
== Proposed REing methodology ==
1. Choose a "uniform" you want to RE below
2. Take note of its ID and type !
3. Depending on whether its a float or not, go through the gigantic switches in shm_uniformfv or shm_uniformiv (non-float) based on the ID of your uniform
4. Once you find the piece of code specific to your uniform, take note of how the values passed to shm_uniformfv/shm_uniformiv are written to the shader object
5. Go through __shv_validateShaderValidator looking for where those fields written to in shm_uniformfv/shm_uniformiv are used and written to the GPU command buffer either directly or through __cb_writeRegs, __cb_multiWriteReg or __cb_fillRegs.
6. Document findings on 3Dbrew ! (that's the most important step)
== Fragment "uniform" list ==
== Fragment "uniform" list ==