diff options
Diffstat (limited to 'source/blender/gpu/opengl/gl_shader.cc')
| -rw-r--r-- | source/blender/gpu/opengl/gl_shader.cc | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/source/blender/gpu/opengl/gl_shader.cc b/source/blender/gpu/opengl/gl_shader.cc index b336d56efcf..6c746d91336 100644 --- a/source/blender/gpu/opengl/gl_shader.cc +++ b/source/blender/gpu/opengl/gl_shader.cc @@ -306,3 +306,111 @@ void GLShader::uniform_int(int location, int comp_len, int array_size, const int } /** \} */ + +/* -------------------------------------------------------------------- */ +/** \name GPUVertFormat from Shader + * \{ */ + +static uint calc_component_size(const GLenum gl_type) +{ + switch (gl_type) { + case GL_FLOAT_VEC2: + case GL_INT_VEC2: + case GL_UNSIGNED_INT_VEC2: + return 2; + case GL_FLOAT_VEC3: + case GL_INT_VEC3: + case GL_UNSIGNED_INT_VEC3: + return 3; + case GL_FLOAT_VEC4: + case GL_FLOAT_MAT2: + case GL_INT_VEC4: + case GL_UNSIGNED_INT_VEC4: + return 4; + case GL_FLOAT_MAT3: + return 9; + case GL_FLOAT_MAT4: + return 16; + case GL_FLOAT_MAT2x3: + case GL_FLOAT_MAT3x2: + return 6; + case GL_FLOAT_MAT2x4: + case GL_FLOAT_MAT4x2: + return 8; + case GL_FLOAT_MAT3x4: + case GL_FLOAT_MAT4x3: + return 12; + default: + return 1; + } +} + +static void get_fetch_mode_and_comp_type(int gl_type, + GPUVertCompType *r_comp_type, + GPUVertFetchMode *r_fetch_mode) +{ + switch (gl_type) { + case GL_FLOAT: + case GL_FLOAT_VEC2: + case GL_FLOAT_VEC3: + case GL_FLOAT_VEC4: + case GL_FLOAT_MAT2: + case GL_FLOAT_MAT3: + case GL_FLOAT_MAT4: + case GL_FLOAT_MAT2x3: + case GL_FLOAT_MAT2x4: + case GL_FLOAT_MAT3x2: + case GL_FLOAT_MAT3x4: + case GL_FLOAT_MAT4x2: + case GL_FLOAT_MAT4x3: + *r_comp_type = GPU_COMP_F32; + *r_fetch_mode = GPU_FETCH_FLOAT; + break; + case GL_INT: + case GL_INT_VEC2: + case GL_INT_VEC3: + case GL_INT_VEC4: + *r_comp_type = GPU_COMP_I32; + *r_fetch_mode = GPU_FETCH_INT; + break; + case GL_UNSIGNED_INT: + case GL_UNSIGNED_INT_VEC2: + case GL_UNSIGNED_INT_VEC3: + case GL_UNSIGNED_INT_VEC4: + *r_comp_type = GPU_COMP_U32; + *r_fetch_mode = GPU_FETCH_INT; + break; + default: + BLI_assert(0); + } +} + +void GLShader::vertformat_from_shader(GPUVertFormat *format) const +{ + GPU_vertformat_clear(format); + + GLint attr_len; + glGetProgramiv(shader_program_, GL_ACTIVE_ATTRIBUTES, &attr_len); + + for (int i = 0; i < attr_len; i++) { + char name[256]; + GLenum gl_type; + GLint size; + glGetActiveAttrib(shader_program_, i, sizeof(name), NULL, &size, &gl_type, name); + + /* Ignore OpenGL names like `gl_BaseInstanceARB`, `gl_InstanceID` and `gl_VertexID`. */ + if (glGetAttribLocation(shader_program_, name) == -1) { + continue; + } + + GPUVertCompType comp_type; + GPUVertFetchMode fetch_mode; + get_fetch_mode_and_comp_type(gl_type, &comp_type, &fetch_mode); + + int comp_len = calc_component_size(gl_type) * size; + + GPU_vertformat_attr_add(format, name, comp_type, comp_len, fetch_mode); + } +} + +/** \} */ |