From: Ian Romanick <[email protected]> This test also comes from layout-std140. Verify that the base alignment of a structure is that of a vec4, per std140 rule #9.
This test fails on NVIDIA's closed source driver (version 331.89 on GTX260). Signed-off-by: Ian Romanick <[email protected]> --- .../struct_base_alignment.shader_test | 100 +++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 tests/spec/arb_uniform_buffer_object/struct_base_alignment.shader_test diff --git a/tests/spec/arb_uniform_buffer_object/struct_base_alignment.shader_test b/tests/spec/arb_uniform_buffer_object/struct_base_alignment.shader_test new file mode 100644 index 0000000..4239b6d --- /dev/null +++ b/tests/spec/arb_uniform_buffer_object/struct_base_alignment.shader_test @@ -0,0 +1,100 @@ +[require] +GLSL >= 1.30 +GL_ARB_uniform_buffer_object + +[vertex shader] +#extension GL_ARB_uniform_buffer_object : require + +struct S1 { + float r; +}; + +struct S2 { + float g; + float b; + float a; +}; + +/* Section 2.11.4 (Uniform Variables), subsection Standard Uniform + * Block Layout, of the OpenGL 3.1 spec says (emphasis mine): + * + * "(9) If the member is a structure, the base alignment of the + * structure is <N>, where <N> is the largest base alignment value + * of any of its members, and *rounded up to the base alignment of + * a vec4*. The individual members of this sub-structure are then + * assigned offsets by applying this set of rules recursively, + * where the base offset of the first member of the sub-structure + * is equal to the aligned offset of the structure. The structure + * may have padding at the end; the base offset of the member + * following the sub-structure is rounded up to the next multiple + * of the base alignment of the structure." + */ +struct S { + S1 s1; + S2 s2; +}; + +layout(std140) uniform ubo1 { + S s; +}; + +in vec4 piglit_vertex; +flat out int pass; + +void main() +{ + /* std140 (or shared) layout prevents any fields or blocks from being + * eliminted. Section 2.11.6 of the OpenGL ES 3.0 spec makes this + * explicit, but desktop GL specs only say it implicitly. Either way, + * there is no need to reference any field of the std140 block. + */ + gl_Position = piglit_vertex; + + pass = int(s.s2.g == 3.3); + +} + +[fragment shader] +out vec4 piglit_fragcolor; +flat in int pass; + +void main() +{ + piglit_fragcolor = bool(pass) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1); +} + +[test] +link success + +active uniform s.s1.r GL_UNIFORM_TYPE GL_FLOAT +active uniform s.s1.r GL_UNIFORM_SIZE 1 +active uniform s.s1.r GL_UNIFORM_OFFSET 0 +active uniform s.s1.r GL_UNIFORM_ARRAY_STRIDE 0 +active uniform s.s1.r GL_UNIFORM_MATRIX_STRIDE 0 +active uniform s.s1.r GL_UNIFORM_IS_ROW_MAJOR 0 + +active uniform s.s2.g GL_UNIFORM_TYPE GL_FLOAT +active uniform s.s2.g GL_UNIFORM_SIZE 1 +active uniform s.s2.g GL_UNIFORM_OFFSET 16 +active uniform s.s2.g GL_UNIFORM_ARRAY_STRIDE 0 +active uniform s.s2.g GL_UNIFORM_MATRIX_STRIDE 0 +active uniform s.s2.g GL_UNIFORM_IS_ROW_MAJOR 0 + +active uniform s.s2.b GL_UNIFORM_TYPE GL_FLOAT +active uniform s.s2.b GL_UNIFORM_SIZE 1 +active uniform s.s2.b GL_UNIFORM_OFFSET 20 +active uniform s.s2.b GL_UNIFORM_ARRAY_STRIDE 0 +active uniform s.s2.b GL_UNIFORM_MATRIX_STRIDE 0 +active uniform s.s2.b GL_UNIFORM_IS_ROW_MAJOR 0 + +active uniform s.s2.a GL_UNIFORM_TYPE GL_FLOAT +active uniform s.s2.a GL_UNIFORM_SIZE 1 +active uniform s.s2.a GL_UNIFORM_OFFSET 24 +active uniform s.s2.a GL_UNIFORM_ARRAY_STRIDE 0 +active uniform s.s2.a GL_UNIFORM_MATRIX_STRIDE 0 +active uniform s.s2.a GL_UNIFORM_IS_ROW_MAJOR 0 + +uniform float s.s2.g 3.3 + +draw rect -1 -1 2 2 +probe all rgba 0.0 1.0 0.0 1.0 -- 1.8.1.4 _______________________________________________ Piglit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/piglit
