[Mesa-dev] [PATCH 14/46] mesa: allow setting of patch parameters.

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

Based on a patch from Fabian Bieler <fabianbieler at fastmail.fm>.
---
 src/mesa/main/mtypes.h    |  5 +++++
 src/mesa/main/shaderapi.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 07a4b97..5f49c25 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -4089,6 +4089,11 @@ 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 a247250..210746c 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;
+   }
 }
 
-- 
2.1.0