diff options
| -rw-r--r-- | src/glsl/link_uniforms.cpp | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/glsl/link_uniforms.cpp b/src/glsl/link_uniforms.cpp index 4f21a41..25dc1d7 100644 --- a/src/glsl/link_uniforms.cpp +++ b/src/glsl/link_uniforms.cpp @@ -500,7 +500,19 @@ link_assign_uniform_block_offsets(struct gl_shader *shader) ubo_var->Offset = offset; offset += size; } - block->UniformBufferSize = offset; + + /* From the GL_ARB_uniform_buffer_object spec: + * + * "For uniform blocks laid out according to [std140] rules, + * the minimum buffer object size returned by the + * UNIFORM_BLOCK_DATA_SIZE query is derived by taking the + * offset of the last basic machine unit consumed by the + * last uniform of the uniform block (including any + * end-of-array or end-of-structure padding), adding one, + * and rounding up to the next multiple of the base + * alignment required for a vec4." + */ + block->UniformBufferSize = align(offset, 16); } } |