mesa/sso: Add gl_pipeline_object parameter to _mesa_use_shader_program

Extend use_shader_program to support a different target. Allow to reuse the
function to update the pipeline state. Note I bypass the flush when target
isn't current. Maybe it would be better to create a new UseProgramStages
driver function

This was originally included in another patch, but it was split out by
Ian Romanick.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

3 files changed, 24 insertions, 15 deletions

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index dbc6ab2a70..acf927b09a 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -899,16 +899,19 @@ _mesa_meta_end(struct gl_context *ctx)
 
       if (ctx->Extensions.ARB_vertex_shader) {
 	 _mesa_use_shader_program(ctx, GL_VERTEX_SHADER,
-                                  save->Shader[MESA_SHADER_VERTEX]);
+                                  save->Shader[MESA_SHADER_VERTEX],
+                                  ctx->_Shader);
       }
 
       if (_mesa_has_geometry_shaders(ctx))
 	 _mesa_use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB,
-				  save->Shader[MESA_SHADER_GEOMETRY]);
+                                  save->Shader[MESA_SHADER_GEOMETRY],
+                                  ctx->_Shader);
 
       if (ctx->Extensions.ARB_fragment_shader)
 	 _mesa_use_shader_program(ctx, GL_FRAGMENT_SHADER,
-				  save->Shader[MESA_SHADER_FRAGMENT]);
+                                  save->Shader[MESA_SHADER_FRAGMENT],
+                                  ctx->_Shader);
 
       _mesa_reference_shader_program(ctx, &ctx->_Shader->ActiveProgram,
 				     save->ActiveShader);
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index ada2623351..1c8e6b4cf5 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -989,17 +989,21 @@ _mesa_active_program(struct gl_context *ctx, struct gl_shader_program *shProg,
  */
 static void
 use_shader_program(struct gl_context *ctx, GLenum type,
-		   struct gl_shader_program *shProg)
+                   struct gl_shader_program *shProg,
+                   struct gl_pipeline_object *shTarget)
 {
    struct gl_shader_program **target;
    gl_shader_stage stage = _mesa_shader_enum_to_shader_stage(type);
 
-   target = &ctx->_Shader->CurrentProgram[stage];
+   target = &shTarget->CurrentProgram[stage];
    if ((shProg == NULL) || (shProg->_LinkedShaders[stage] == NULL))
       shProg = NULL;
 
    if (*target != shProg) {
-      FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
+      /* Program is current, flush it */
+      if (shTarget == ctx->_Shader) {
+         FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
+      }
 
       /* If the shader is also bound as the current rendering shader, unbind
        * it from that binding point as well.  This ensures that the correct
@@ -1035,10 +1039,10 @@ use_shader_program(struct gl_context *ctx, GLenum type,
 void
 _mesa_use_program(struct gl_context *ctx, struct gl_shader_program *shProg)
 {
-   use_shader_program(ctx, GL_VERTEX_SHADER, shProg);
-   use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg);
-   use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg);
-   use_shader_program(ctx, GL_COMPUTE_SHADER, shProg);
+   use_shader_program(ctx, GL_VERTEX_SHADER, shProg, &ctx->Shader);
+   use_shader_program(ctx, GL_GEOMETRY_SHADER_ARB, shProg, &ctx->Shader);
+   use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg, &ctx->Shader);
+   use_shader_program(ctx, GL_COMPUTE_SHADER, shProg, &ctx->Shader);
    _mesa_active_program(ctx, shProg, "glUseProgram");
 
    if (ctx->Driver.UseProgram)
@@ -1800,9 +1804,10 @@ _mesa_ProgramParameteri(GLuint program, GLenum pname, GLint value)
 
 void
 _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
-			 struct gl_shader_program *shProg)
+                         struct gl_shader_program *shProg,
+                         struct gl_pipeline_object *shTarget)
 {
-   use_shader_program(ctx, type, shProg);
+   use_shader_program(ctx, type, shProg, shTarget);
 
    if (ctx->Driver.UseProgram)
       ctx->Driver.UseProgram(ctx, shProg);
@@ -1856,10 +1861,10 @@ _mesa_UseShaderProgramEXT(GLenum type, GLuint program)
       /* Attach shader state to the binding point */
       _mesa_reference_pipeline_object(ctx, &ctx->_Shader, &ctx->Shader);
       /* Update the program */
-      _mesa_use_shader_program(ctx, type, shProg);
+      _mesa_use_shader_program(ctx, type, shProg, ctx->_Shader);
    } else {
       /* Must be done first: detach the progam */
-      _mesa_use_shader_program(ctx, type, shProg);
+      _mesa_use_shader_program(ctx, type, shProg, ctx->_Shader);
 
       /* Nothing remains current */
       if (!ctx->Shader.CurrentProgram[MESA_SHADER_VERTEX] &&
diff --git a/src/mesa/main/shaderapi.h b/src/mesa/main/shaderapi.h
index 44426cc65c..17b05b3137 100644
--- a/src/mesa/main/shaderapi.h
+++ b/src/mesa/main/shaderapi.h
@@ -202,7 +202,8 @@ _mesa_ProgramParameteri(GLuint program, GLenum pname, GLint value);
 
 void
 _mesa_use_shader_program(struct gl_context *ctx, GLenum type,
-			 struct gl_shader_program *shProg);
+                         struct gl_shader_program *shProg,
+                         struct gl_pipeline_object *shTarget);
 
 extern void GLAPIENTRY
 _mesa_UseShaderProgramEXT(GLenum type, GLuint program);