1 /**************************************************************************
3 * Copyright 2010 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 * Transform feedback functions.
36 #include "main/imports.h"
37 #include "main/context.h"
38 #include "main/mfeatures.h"
39 #include "main/transformfeedback.h"
41 #include "st_cb_xformfb.h"
44 #if FEATURE_EXT_transform_feedback
47 static struct gl_transform_feedback_object *
48 st_new_transform_feedback(struct gl_context *ctx, GLuint name)
50 struct gl_transform_feedback_object *obj;
51 obj = CALLOC_STRUCT(gl_transform_feedback_object);
62 st_delete_transform_feedback(struct gl_context *ctx,
63 struct gl_transform_feedback_object *obj)
67 for (i = 0; i < Elements(obj->Buffers); i++) {
68 _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
77 st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
78 struct gl_transform_feedback_object *obj)
85 st_end_transform_feedback(struct gl_context *ctx,
86 struct gl_transform_feedback_object *obj)
93 st_pause_transform_feedback(struct gl_context *ctx,
94 struct gl_transform_feedback_object *obj)
101 st_resume_transform_feedback(struct gl_context *ctx,
102 struct gl_transform_feedback_object *obj)
109 st_draw_transform_feedback(struct gl_context *ctx, GLenum mode,
110 struct gl_transform_feedback_object *obj)
114 * Get number of vertices in obj's feedback buffer.
115 * Call ctx->Exec.DrawArrays(mode, 0, count);
121 st_init_xformfb_functions(struct dd_function_table *functions)
123 /* let core Mesa plug in its functions */
124 _mesa_init_transform_feedback_functions(functions);
126 /* then override a few: */
127 functions->BeginTransformFeedback = st_begin_transform_feedback;
128 functions->EndTransformFeedback = st_end_transform_feedback;
129 functions->PauseTransformFeedback = st_pause_transform_feedback;
130 functions->ResumeTransformFeedback = st_resume_transform_feedback;
131 functions->DrawTransformFeedback = st_draw_transform_feedback;
134 #endif /* FEATURE_EXT_transform_feedback */