mesa: Refactor copying of linked program data.

This patch creates a single function to copy the the UsesClipDistance
flag from gl_shader_program.Vert to gl_vertex_program.  Previously
this logic was duplicated in the i965-specific function
brw_link_shader() and the core mesa function _mesa_ir_link_shader().

This logic will have to be expanded to support geometry shaders, and I
don't want to have to update it in two separate places.

Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

5 files changed, 35 insertions, 10 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 418ea9b0331..9a2e8bebfd0 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -29,6 +29,7 @@ extern "C" {
 #include "brw_fs.h"
 #include "glsl/ir_optimization.h"
 #include "glsl/glsl_parser_extras.h"
+#include "main/shaderapi.h"
 
 struct gl_shader *
 brw_new_shader(struct gl_context *ctx, GLuint name, GLuint type)
@@ -127,10 +128,7 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
 	return false;
       prog->Parameters = _mesa_new_parameter_list();
 
-      if (stage == 0) {
-	 struct gl_vertex_program *vp = (struct gl_vertex_program *) prog;
-	 vp->UsesClipDistance = shProg->Vert.UsesClipDistance;
-      }
+      _mesa_copy_linked_program_data((gl_shader_type) stage, shProg, prog);
 
       void *mem_ctx = ralloc_context(NULL);
       bool progress;
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index c78fe855f6c..c166645aa0f 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2329,9 +2329,13 @@ struct gl_shader_program
       GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
    } Geom;
 
-   /** Vertex shader state - copied into gl_vertex_program at link time */
+   /** Vertex shader state */
    struct {
-      GLboolean UsesClipDistance; /**< True if gl_ClipDistance is written to. */
+      /**
+       * True if gl_ClipDistance is written to.  Copied into gl_vertex_program
+       * by _mesa_copy_linked_program_data().
+       */
+      GLboolean UsesClipDistance;
       GLuint ClipDistanceArraySize; /**< Size of the gl_ClipDistance array, or
                                          0 if not present. */
    } Vert;
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 3f9402c598c..8a0909be13f 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1842,3 +1842,24 @@ _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
 
    return program;
 }
+
+
+/**
+ * Copy program-specific data generated by linking from the gl_shader_program
+ * object to a specific gl_program object.
+ */
+void
+_mesa_copy_linked_program_data(gl_shader_type type,
+                               const struct gl_shader_program *src,
+                               struct gl_program *dst)
+{
+   switch (type) {
+   case MESA_SHADER_VERTEX: {
+      struct gl_vertex_program *dst_vp = (struct gl_vertex_program *) dst;
+      dst_vp->UsesClipDistance = src->Vert.UsesClipDistance;
+   }
+      break;
+   default:
+      break;
+   }
+}
diff --git a/src/mesa/main/shaderapi.h b/src/mesa/main/shaderapi.h
index 1cd4ffcea03..fe58e7de9bd 100644
--- a/src/mesa/main/shaderapi.h
+++ b/src/mesa/main/shaderapi.h
@@ -210,6 +210,11 @@ _mesa_ActiveProgramEXT(GLuint program);
 extern GLuint GLAPIENTRY
 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string);
 
+extern void
+_mesa_copy_linked_program_data(gl_shader_type type,
+                               const struct gl_shader_program *src,
+                               struct gl_program *dst);
+
 
 #ifdef __cplusplus
 }
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index ae78aca19d3..f612f41baff 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -3087,10 +3087,7 @@ _mesa_ir_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
       linked_prog = get_mesa_program(ctx, prog, prog->_LinkedShaders[i]);
 
       if (linked_prog) {
-	 if (i == MESA_SHADER_VERTEX) {
-            ((struct gl_vertex_program *)linked_prog)->UsesClipDistance
-               = prog->Vert.UsesClipDistance;
-	 }
+         _mesa_copy_linked_program_data((gl_shader_type) i, prog, linked_prog);
 
 	 _mesa_reference_program(ctx, &prog->_LinkedShaders[i]->Program,
 				 linked_prog);