Mesa (master): glsl: Keep track of the set of fragment outputs read by a GL program.

[Francisco Jerez]

Module: Mesa
Branch: master
Commit: 2018371692d9ea57805989b0390b833e785881bf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2018371692d9ea57805989b0390b833e785881bf

Author: Francisco Jerez <currojerez at riseup.net>
Date:   Tue Jul 19 20:30:24 2016 -0700

glsl: Keep track of the set of fragment outputs read by a GL program.

This is the set of shader outputs whose initial value is provided to
the shader by some external means when the shader is executed, rather
than computed by the shader itself.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/compiler/glsl/ir_set_program_inouts.cpp | 3 +++
 src/mesa/main/mtypes.h                      | 1 +
 2 files changed, 4 insertions(+)

diff --git a/src/compiler/glsl/ir_set_program_inouts.cpp b/src/compiler/glsl/ir_set_program_inouts.cpp
index a6475b5..fcfbcd4 100644
--- a/src/compiler/glsl/ir_set_program_inouts.cpp
+++ b/src/compiler/glsl/ir_set_program_inouts.cpp
@@ -139,6 +139,8 @@ mark(struct gl_program *prog, ir_variable *var, int offset, int len,
             prog->PatchOutputsWritten |= bitfield;
          else if (!var->data.read_only)
             prog->OutputsWritten |= bitfield;
+         if (var->data.fb_fetch_output)
+            prog->OutputsRead |= bitfield;
       }
    }
 }
@@ -444,6 +446,7 @@ do_set_program_inouts(exec_list *instructions, struct gl_program *prog,
 
    prog->InputsRead = 0;
    prog->OutputsWritten = 0;
+   prog->OutputsRead = 0;
    prog->PatchInputsRead = 0;
    prog->PatchOutputsWritten = 0;
    prog->SystemValuesRead = 0;
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 965de5d..d0ceda9 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1907,6 +1907,7 @@ struct gl_program
    GLbitfield64 InputsRead;     /**< Bitmask of which input regs are read */
    GLbitfield64 DoubleInputsRead;     /**< Bitmask of which input regs are read  and are doubles */
    GLbitfield64 OutputsWritten; /**< Bitmask of which output regs are written */
+   GLbitfield64 OutputsRead; /**< Bitmask of which output regs are read */
    GLbitfield PatchInputsRead;  /**< VAR[0..31] usage for patch inputs (user-defined only) */
    GLbitfield PatchOutputsWritten; /**< VAR[0..31] usage for patch outputs (user-defined only) */
    GLbitfield SystemValuesRead;   /**< Bitmask of SYSTEM_VALUE_x inputs used */