r300g/compiler: add shader emulation for the alpha_to_one state

diff --git a/src/gallium/drivers/r300/compiler/r3xx_fragprog.c b/src/gallium/drivers/r300/compiler/r3xx_fragprog.c
index 8ef2d24..7c9a352 100644 (file)
--- a/src/gallium/drivers/r300/compiler/r3xx_fragprog.c
+++ b/src/gallium/drivers/r300/compiler/r3xx_fragprog.c
@@ -82,8 +82,14 @@ void r3xx_compile_fragment_program(struct r300_fragment_program_compiler* c)
 {
        int is_r500 = c->Base.is_r500;
        int opt = !c->Base.disable_optimizations;
+       int alpha2one = c->state.alpha_to_one;
 
        /* Lists of instruction transformations. */
+       struct radeon_program_transformation force_alpha_to_one[] = {
+               { &rc_force_output_alpha_to_one, c },
+               { 0, 0 }
+       };
+
        struct radeon_program_transformation rewrite_tex[] = {
                { &radeonTransformTEX, c },
                { 0, 0 }
@@ -117,6 +123,7 @@ void r3xx_compile_fragment_program(struct r300_fragment_program_compiler* c)
                {"unroll loops",                1, is_r500,     rc_unroll_loops,                NULL},
                {"transform loops",             1, !is_r500,    rc_transform_loops,             NULL},
                {"emulate branches",            1, !is_r500,    rc_emulate_branches,            NULL},
+               {"force alpha to one",          1, alpha2one,   rc_local_transform,             force_alpha_to_one},
                {"transform TEX",               1, 1,           rc_local_transform,             rewrite_tex},
                {"transform IF",                1, is_r500,     rc_local_transform,             rewrite_if},
                {"native rewrite",              1, is_r500,     rc_local_transform,             native_rewrite_r500},

diff --git a/src/gallium/drivers/r300/compiler/radeon_code.h b/src/gallium/drivers/r300/compiler/radeon_code.h
index 44d5500..beafc26 100644 (file)
--- a/src/gallium/drivers/r300/compiler/radeon_code.h
+++ b/src/gallium/drivers/r300/compiler/radeon_code.h
@@ -182,6 +182,8 @@ struct r300_fragment_program_external_state {
                 */
                unsigned convert_unorm_to_snorm:1;
        } unit[16];
+
+       unsigned alpha_to_one:1;
 };
 
 

diff --git a/src/gallium/drivers/r300/compiler/radeon_program_alu.c b/src/gallium/drivers/r300/compiler/radeon_program_alu.c
index f4ee86d..4dc4250 100644 (file)
--- a/src/gallium/drivers/r300/compiler/radeon_program_alu.c
+++ b/src/gallium/drivers/r300/compiler/radeon_program_alu.c
@@ -1283,3 +1283,31 @@ void rc_transform_KILP(struct radeon_compiler * c, void *user)
                }
        }
 }
+
+int rc_force_output_alpha_to_one(struct radeon_compiler *c,
+                                struct rc_instruction *inst, void *data)
+{
+       struct r300_fragment_program_compiler *fragc = (struct r300_fragment_program_compiler*)c;
+       const struct rc_opcode_info *info = rc_get_opcode_info(inst->U.I.Opcode);
+       unsigned tmp;
+
+       if (!info->HasDstReg || inst->U.I.DstReg.File != RC_FILE_OUTPUT ||
+           inst->U.I.DstReg.Index == fragc->OutputDepth)
+               return 1;
+
+       tmp = rc_find_free_temporary(c);
+
+       /* Insert MOV after inst, set alpha to 1. */
+       emit1(c, inst, RC_OPCODE_MOV, 0, inst->U.I.DstReg,
+             srcregswz(RC_FILE_TEMPORARY, tmp, RC_SWIZZLE_XYZ1));
+
+       /* Re-route the destination of inst to the source of mov. */
+       inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+       inst->U.I.DstReg.Index = tmp;
+
+       /* Move the saturate output modifier to the MOV instruction
+        * (for better copy propagation). */
+       inst->Next->U.I.SaturateMode = inst->U.I.SaturateMode;
+       inst->U.I.SaturateMode = RC_SATURATE_NONE;
+       return 1;
+}

diff --git a/src/gallium/drivers/r300/compiler/radeon_program_alu.h b/src/gallium/drivers/r300/compiler/radeon_program_alu.h
index b5f361e..8f8dc70 100644 (file)
--- a/src/gallium/drivers/r300/compiler/radeon_program_alu.h
+++ b/src/gallium/drivers/r300/compiler/radeon_program_alu.h
@@ -63,4 +63,7 @@ int radeonTransformDeriv(
 void rc_transform_KILP(struct radeon_compiler * c,
                       void *user);
 
+int rc_force_output_alpha_to_one(struct radeon_compiler *c,
+                                struct rc_instruction *inst, void *data);
+
 #endif /* __RADEON_PROGRAM_ALU_H_ */

diff --git a/src/gallium/drivers/r300/compiler/radeon_program_constants.h b/src/gallium/drivers/r300/compiler/radeon_program_constants.h
index 4dbf649..e54c6a8 100644 (file)
--- a/src/gallium/drivers/r300/compiler/radeon_program_constants.h
+++ b/src/gallium/drivers/r300/compiler/radeon_program_constants.h
@@ -126,6 +126,7 @@ typedef enum {
 
 #define RC_SWIZZLE_XYZW RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_W)
 #define RC_SWIZZLE_XYZ0 RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO)
+#define RC_SWIZZLE_XYZ1 RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ONE)
 #define RC_SWIZZLE_XYZZ RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z)
 #define RC_SWIZZLE_XXXX RC_MAKE_SWIZZLE_SMEAR(RC_SWIZZLE_X)
 #define RC_SWIZZLE_YYYY RC_MAKE_SWIZZLE_SMEAR(RC_SWIZZLE_Y)