mesa: allow setting of patch parameters.

Based on a patch from Fabian Bieler <[email protected]>.
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 47 insertions, 2 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index e4342e0308c..e30f923dd7b 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -4161,6 +4161,11 @@ struct gl_driver_flags
     * gl_context::ImageUnits
     */
    uint64_t NewImageUnits;
+
+   /**
+    * gl_context::TessCtrlProgram::patch_default_*
+    */
+   uint64_t NewDefaultTessLevels;
 };
 
 struct gl_uniform_buffer_binding
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index a666fdf3d7e..2a40eea1d41 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1999,13 +1999,53 @@ _mesa_CreateShaderProgramv(GLenum type, GLsizei count,
 extern void GLAPIENTRY
 _mesa_PatchParameteri(GLenum pname, GLint value)
 {
-   /* STUB */
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (!_mesa_has_tessellation(ctx)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glPatchParameteri");
+      return;
+   }
+
+   if (pname != GL_PATCH_VERTICES) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glPatchParameteri");
+      return;
+   }
+
+   if (value <= 0 || value > ctx->Const.MaxPatchVertices) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glPatchParameteri");
+      return;
+   }
+
+   ctx->TessCtrlProgram.patch_vertices = value;
 }
 
 
 extern void GLAPIENTRY
 _mesa_PatchParameterfv(GLenum pname, const GLfloat *values)
 {
-   /* STUB */
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (!_mesa_has_tessellation(ctx)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glPatchParameterfv");
+      return;
+   }
+
+   switch(pname) {
+   case GL_PATCH_DEFAULT_OUTER_LEVEL:
+      FLUSH_VERTICES(ctx, 0);
+      memcpy(ctx->TessCtrlProgram.patch_default_outer_level, values,
+             4 * sizeof(GLfloat));
+      ctx->NewDriverState |= ctx->DriverFlags.NewDefaultTessLevels;
+      return;
+   case GL_PATCH_DEFAULT_INNER_LEVEL:
+      FLUSH_VERTICES(ctx, 0);
+      memcpy(ctx->TessCtrlProgram.patch_default_inner_level, values,
+             2 * sizeof(GLfloat));
+      ctx->NewDriverState |= ctx->DriverFlags.NewDefaultTessLevels;
+      return;
+   default:
+      _mesa_error(ctx, GL_INVALID_ENUM, "glPatchParameterfv");
+      return;
+   }
 }