Copy fragment z if the fragment shader does not write depth on its own.`

1 files changed, 30 insertions, 3 deletions

diff --git a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
index 2ac04e8d56..2c8deac034 100644
--- a/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
+++ b/src/mesa/pipe/tgsi/mesa/mesa_to_tgsi.c
@@ -4,7 +4,7 @@
 #define TGSI_DEBUG 1

 

 /*

- * Map mesa register file to SBIR register file.

+ * Map mesa register file to TGSI register file.

  */

 static GLuint

 map_register_file(

@@ -35,7 +35,7 @@ map_register_file(
 }

 

 /**

- * Map mesa register file index to SBIR index.

+ * Map mesa register file index to TGSI index.

  * Take special care when processing input and output indices.

  * \param processor  either TGSI_PROCESSOR_FRAGMENT or  TGSI_PROCESSOR_VERTEX

  * \param file  one of TGSI_FILE_x

@@ -101,7 +101,7 @@ map_register_file_index(
 }

 

 /*

- * Map mesa texture target to SBIR texture target.

+ * Map mesa texture target to TGSI texture target.

  */

 static GLuint

 map_texture_target(

@@ -609,6 +609,33 @@ tgsi_mesa_compile_fp_program(
          maxTokens - ti );

    }

 

+   /*

+    * Copy fragment z if the shader does not write it.

+    */

+   if( !(program->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR)) ) {

+      fullinst = tgsi_default_full_instruction();

+

+      fullinst.Instruction.Opcode = TGSI_OPCODE_MOV;

+      fullinst.Instruction.NumDstRegs = 1;

+      fullinst.Instruction.NumSrcRegs = 1;

+

+      fulldst = &fullinst.FullDstRegisters[0];

+      fulldst->DstRegister.File = TGSI_FILE_OUTPUT;

+      fulldst->DstRegister.Index = 0;

+      fulldst->DstRegister.WriteMask = TGSI_WRITEMASK_Z;

+

+      fullsrc = &fullinst.FullSrcRegisters[0];

+      fullsrc->SrcRegister.File = TGSI_FILE_INPUT;

+      fullsrc->SrcRegister.Index = 0;

+

+      ti += tgsi_build_full_instruction(

+         &fullinst,

+         &tokens[ti],

+         header,

+         maxTokens - ti );

+      preamble_size++;

+   }

+

    for( i = 0; i < program->Base.NumInstructions; i++ ) {

       if( compile_instruction(

             &program->Base.Instructions[i],