Hello. I'm working on providing piglit with tests for the GL_ARB_gpu_shader_fp64 extension[1].
One of the modifications it does is referring uniform variables: "Modify Section 2.14.4, Uniform Variables, p. 89 (modify third paragraph, p. 90) ... uniform variable storage for vertex shader. A uniform matrix with single- or double-precision components will consume no more than 4 * min(r,c) or 8 * min(r,c) uniform components, respectively. A scalar or vector uniform with double- precision components will consume no more than 2<n> components, where <n> is 1 for scalars, and the component count for vectors. A link error is generated ..." So a float/int/bool consumes 1 UC (Uniform Component), and a double consumes 2 UCs. A vec3 for instance will consume 3*1=3 UCs, and a dvec3, 3*2=6 UCs. The interesting part is about matrices: a mat3x2 won't consume more than 4*min(3,2)=8 UCs (ideally would consume 1*3*2=6 UCs, but spec allows a bit more), while a dmat3x2 will consume 8*min(3,2)=16 UCs (again, ideally 2*3*2=12 UCs). The question is, how to test this (if it is possible)? I didn't find any way to know how many UCs an uniform variable is consuming, either direct or indirectly. Does any know if it is possible, and how to do it? I guess it should be possible, otherwise I don't see the point of specifying something that can be tested later. Thanks in advance! [1]https://www.opengl.org/registry/specs/ARB/gpu_shader_fp64.txt _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
