From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 31 Jan 2013 21:30:44 +0000 (+0100)
Subject: st/mesa: emit saturates in the vertex shader if Shader Model 3.0 is supported
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4362bdadf3069ed3f8e7c9bfccbc649d320dbd76;p=mesa.git

st/mesa: emit saturates in the vertex shader if Shader Model 3.0 is supported

v2: change the requirement from GLSL 1.30 to SM 3.0 (R500 can do this)
---

diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index b416319e1cb..676fc069d83 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -182,6 +182,7 @@ st_create_context_priv( struct gl_context *ctx, struct pipe_context *pipe,
 
    st->has_stencil_export =
       screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT);
+   st->has_shader_model3 = screen->get_param(screen, PIPE_CAP_SM3);
 
    /* GL limits and extensions */
    st_init_limits(st);
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index 70ee671d0c6..726c64d04ae 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -84,6 +84,7 @@ struct st_context
    GLboolean clamp_vert_color_in_shader;
    boolean has_stencil_export; /**< can do shader stencil export? */
    boolean has_time_elapsed;
+   boolean has_shader_model3;
 
    /* On old libGL's for linux we need to invalidate the drawables
     * on glViewpport calls, this is set via a option.
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index b20dfd5dbb5..63b74285aa3 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1287,11 +1287,12 @@ glsl_to_tgsi_visitor::try_emit_mad_for_and_not(ir_expression *ir, int try_operan
 bool
 glsl_to_tgsi_visitor::try_emit_sat(ir_expression *ir)
 {
-   /* Saturates were only introduced to vertex programs in
-    * NV_vertex_program3, so don't give them to drivers in the VP.
+   /* Emit saturates in the vertex shader only if SM 3.0 is supported.
     */
-   if (this->prog->Target == GL_VERTEX_PROGRAM_ARB)
+   if (this->prog->Target == GL_VERTEX_PROGRAM_ARB &&
+       !st_context(this->ctx)->has_shader_model3) {
       return false;
+   }
 
    ir_rvalue *sat_src = ir->as_rvalue_to_saturate();
    if (!sat_src)