From b49d8f20f43ec429e6c17e7d92c7c2d3f926ee5e Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Tue, 19 Jul 2016 20:07:47 -0700 Subject: [PATCH] glsl: Add support for representing framebuffer fetch in the GLSL IR. The GLSL IR representation of framebuffer fetch amounts to a single bit in the ir_variable object applicable to fragment shader outputs. The flag indicates that the variable will be implicitly initialized to the previous contents of the render buffer at the same fragment coordinates and sample index. Reviewed-by: Kenneth Graunke --- src/compiler/glsl/ir.cpp | 1 + src/compiler/glsl/ir.h | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/src/compiler/glsl/ir.cpp b/src/compiler/glsl/ir.cpp index 2aa4aff..4dadfd2 100644 --- a/src/compiler/glsl/ir.cpp +++ b/src/compiler/glsl/ir.cpp @@ -1686,6 +1686,7 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name, this->data.image_volatile = false; this->data.image_restrict = false; this->data.from_ssbo_unsized_array = false; + this->data.fb_fetch_output = false; if (type != NULL) { if (type->base_type == GLSL_TYPE_SAMPLER) diff --git a/src/compiler/glsl/ir.h b/src/compiler/glsl/ir.h index 68e774c..5e1e9bf 100644 --- a/src/compiler/glsl/ir.h +++ b/src/compiler/glsl/ir.h @@ -831,6 +831,14 @@ public: unsigned from_ssbo_unsized_array:1; /**< unsized array buffer variable. */ unsigned implicit_sized_array:1; + + /** + * Whether this is a fragment shader output implicitly initialized with + * the previous contents of the specified render target at the + * framebuffer location corresponding to this shader invocation. + */ + unsigned fb_fetch_output:1; + /** * Emit a warning if this variable is accessed. */ -- 2.7.4