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LibGL+LibSoftGPU: Implement texture coordinate generation

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Texture coordinate generation is the concept of automatically
generating vertex texture coordinates instead of using the provided
coordinates (i.e. `glTexCoord`).

This commit implements support for:

* The `GL_TEXTURE_GEN_Q/R/S/T` capabilities
* The `GL_OBJECT_LINEAR`, `GL_EYE_LINEAR`, `GL_SPHERE_MAP`,
  `GL_REFLECTION_MAP` and `GL_NORMAL_MAP` modes
* Object and eye plane coefficients (write-only at the moment)

This changeset allows Tux Racer to render its terrain :^)
This commit is contained in:
Jelle Raaijmakers 2021-12-30 00:56:41 +01:00 • committed by Andreas Kling
parent 69da279073
commit c19632128c
5 changed files with 236 additions and 8 deletions
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37
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -140,6 +140,7 @@ public:
private:
void sync_device_config();
void sync_device_sampler_config();
void sync_device_texcoord_config();
private:
template<typename T>
@ -243,6 +244,42 @@ private:
Vector<TextureUnit, 32> m_texture_units;
TextureUnit* m_active_texture_unit;
// Texture coordinate generation state
struct TextureCoordinateGeneration {
bool enabled { false };
GLenum generation_mode { GL_EYE_LINEAR };
FloatVector4 object_plane_coefficients;
FloatVector4 eye_plane_coefficients;
};
Array<TextureCoordinateGeneration, 4> m_texture_coordinate_generation {
// S
TextureCoordinateGeneration {
.object_plane_coefficients = { 1.0f, 0.0f, 0.0f, 0.0f },
.eye_plane_coefficients = { 1.0f, 0.0f, 0.0f, 0.0f },
},
// T
TextureCoordinateGeneration {
.object_plane_coefficients = { 0.0f, 1.0f, 0.0f, 0.0f },
.eye_plane_coefficients = { 0.0f, 1.0f, 0.0f, 0.0f },
},
// R
TextureCoordinateGeneration {
.object_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f },
.eye_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f },
},
// Q
TextureCoordinateGeneration {
.object_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f },
.eye_plane_coefficients = { 0.0f, 0.0f, 0.0f, 0.0f },
},
};
bool m_texcoord_generation_dirty { true };
ALWAYS_INLINE TextureCoordinateGeneration& texture_coordinate_generation(GLenum capability)
{
return m_texture_coordinate_generation[capability - GL_TEXTURE_GEN_S];
}
SoftGPU::Device m_rasterizer;
SoftGPU::DeviceInfo const m_device_info;
bool m_sampler_config_is_dirty { true };