[Mesa-dev] [v2 PATCH 04/16] ir_to_mesa, glsl_to_tgsi: lower ir_unop_saturate

[Abdiel Janulgue]

Needed when vertex programs doesn't allow saturate

Reviewed-by: Matt Turner <mattst88 at gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
---
 src/mesa/program/ir_to_mesa.cpp            | 5 ++++-
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 6 +++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 1109051..e592f49 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2987,9 +2987,12 @@ _mesa_ir_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
 
 	 /* Lowering */
 	 do_mat_op_to_vec(ir);
+	 GLenum target = _mesa_shader_stage_to_program(prog->_LinkedShaders[i]->Stage);
 	 lower_instructions(ir, (MOD_TO_FRACT | DIV_TO_MUL_RCP | EXP_TO_EXP2
 				 | LOG_TO_LOG2 | INT_DIV_TO_MUL_RCP
-				 | ((options->EmitNoPow) ? POW_TO_EXP2 : 0)));
+				 | ((options->EmitNoPow) ? POW_TO_EXP2 : 0)
+				 | ((target == GL_VERTEX_PROGRAM_ARB) ? SAT_TO_CLAMP
+                                    : 0)));
 
 	 progress = do_lower_jumps(ir, true, true, options->EmitNoMainReturn, options->EmitNoCont, options->EmitNoLoops) || progress;
 
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 9e19431..749b87b 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5427,6 +5427,9 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
       if (!pscreen->get_param(pscreen, PIPE_CAP_TEXTURE_GATHER_OFFSETS))
          lower_offset_arrays(ir);
       do_mat_op_to_vec(ir);
+      /* Emit saturates in the vertex shader only if SM 3.0 is supported. */
+      bool vs_sm3 = (_mesa_shader_stage_to_program(prog->_LinkedShaders[i]->Stage) ==
+                         GL_VERTEX_PROGRAM_ARB) && st_context(ctx)->has_shader_model3;
       lower_instructions(ir,
                          MOD_TO_FRACT |
                          DIV_TO_MUL_RCP |
@@ -5436,7 +5439,8 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                          CARRY_TO_ARITH |
                          BORROW_TO_ARITH |
                          (options->EmitNoPow ? POW_TO_EXP2 : 0) |
-                         (!ctx->Const.NativeIntegers ? INT_DIV_TO_MUL_RCP : 0));
+                         (!ctx->Const.NativeIntegers ? INT_DIV_TO_MUL_RCP : 0) |
+                         (vs_sm3 ? SAT_TO_CLAMP : 0));
 
       lower_ubo_reference(prog->_LinkedShaders[i], ir);
       do_vec_index_to_cond_assign(ir);
-- 
1.9.1