diff options
| -rw-r--r-- | src/mesa/main/context.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c index 4ff0979c00b..8f9bbf1b732 100644 --- a/src/mesa/main/context.c +++ b/src/mesa/main/context.c @@ -1876,6 +1876,58 @@ check_blend_func_error(struct gl_context *ctx) return false; } } + + if (ctx->Color.BlendEnabled && ctx->Color._AdvancedBlendMode) { + /* The KHR_blend_equation_advanced spec says: + * + * "If any non-NONE draw buffer uses a blend equation found in table + * X.1 or X.2, the error INVALID_OPERATION is generated by Begin or + * any operation that implicitly calls Begin (such as DrawElements) + * if: + * + * * the draw buffer for color output zero selects multiple color + * buffers (e.g., FRONT_AND_BACK in the default framebuffer); or + * + * * the draw buffer for any other color output is not NONE." + */ + if (ctx->DrawBuffer->ColorDrawBuffer[0] == GL_FRONT_AND_BACK) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "advanced blending is active and draw buffer for color " + "output zero selects multiple color buffers"); + return false; + } + + for (unsigned i = 1; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) { + if (ctx->DrawBuffer->ColorDrawBuffer[i] != GL_NONE) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "advanced blending is active with multiple color " + "draw buffers"); + return false; + } + } + + /* The KHR_blend_equation_advanced spec says: + * + * "Advanced blending equations require the use of a fragment shader + * with a matching "blend_support" layout qualifier. If the current + * blend equation is found in table X.1 or X.2, and the active + * fragment shader does not include the layout qualifier matching + * the blend equation or "blend_support_all_equations", the error + * INVALID_OPERATION is generated [...]" + */ + const struct gl_shader_program *sh_prog = + ctx->_Shader->_CurrentFragmentProgram; + const GLbitfield blend_support = !sh_prog ? 0 : + sh_prog->_LinkedShaders[MESA_SHADER_FRAGMENT]->info.BlendSupport; + + if ((blend_support & ctx->Color._AdvancedBlendMode) == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "fragment shader does not allow advanced blending mode " + "(%s)", + _mesa_enum_to_string(ctx->Color.Blend[0].EquationRGB)); + } + } + return true; } |