mesa: more transform feedback infrastructure

Includes GL_ARB_transform_feedback2 which encapsulates transform feedback
state in objects.

1 files changed, 129 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_cb_xformfb.c b/src/mesa/state_tracker/st_cb_xformfb.c
new file mode 100644
index 0000000000..fb48b57eb5
--- /dev/null
+++ b/src/mesa/state_tracker/st_cb_xformfb.c
@@ -0,0 +1,129 @@
+/**************************************************************************
+ * 
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+
+/**
+ * Transform feedback functions.
+ *
+ * \author Brian Paul
+ */
+
+
+#include "main/imports.h"
+#include "main/context.h"
+#include "main/transformfeedback.h"
+
+#include "st_cb_xformfb.h"
+
+
+#if 0
+static struct gl_transform_feedback_object *
+st_new_transform_feedback(GLcontext *ctx, GLuint name)
+{
+   struct gl_transform_feedback_object *obj;
+   obj = CALLOC_STRUCT(gl_transform_feedback_object);
+   if (obj) {
+      obj->Name = name;
+      obj->RefCount = 1;
+   }
+   return obj;
+}
+#endif
+
+#if 0
+static void
+st_delete_transform_feedback(GLcontext *ctx,
+                             struct gl_transform_feedback_object *obj)
+{
+   GLuint i;
+
+   for (i = 0; i < Elements(obj->Buffers); i++) {
+      _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
+   }
+
+   free(obj);
+}
+#endif
+
+
+static void
+st_begin_transform_feedback(GLcontext *ctx, GLenum mode,
+                            struct gl_transform_feedback_object *obj)
+{
+   /* to-do */
+}
+
+
+static void
+st_end_transform_feedback(GLcontext *ctx,
+                          struct gl_transform_feedback_object *obj)
+{
+   /* to-do */
+}
+
+
+static void
+st_pause_transform_feedback(GLcontext *ctx,
+                            struct gl_transform_feedback_object *obj)
+{
+   /* to-do */
+}
+
+
+static void
+st_resume_transform_feedback(GLcontext *ctx,
+                             struct gl_transform_feedback_object *obj)
+{
+   /* to-do */
+}
+
+
+static void
+st_draw_transform_feedback(GLcontext *ctx, GLenum mode,
+                           struct gl_transform_feedback_object *obj)
+{
+   /* XXX to do */
+   /*
+    * Get number of vertices in obj's feedback buffer.
+    * Call ctx->Exec.DrawArrays(mode, 0, count);
+    */
+}
+
+
+void
+st_init_xformfb_functions(struct dd_function_table *functions)
+{
+   /* let core Mesa plug in its functions */
+   _mesa_init_transform_feedback_functions(functions);
+
+   /* then override a few: */
+   functions->BeginTransformFeedback = st_begin_transform_feedback;
+   functions->EndTransformFeedback = st_end_transform_feedback;
+   functions->PauseTransformFeedback = st_pause_transform_feedback;
+   functions->ResumeTransformFeedback = st_resume_transform_feedback;
+   functions->DrawTransformFeedback = st_draw_transform_feedback;
+}