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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2010 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  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:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  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.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. /**
  30.  * Transform feedback functions.
  31.  *
  32.  * \author Brian Paul
  33.  */
  34.  
  35.  
  36. #include "main/imports.h"
  37. #include "main/context.h"
  38. #include "main/transformfeedback.h"
  39.  
  40. #include "st_cb_xformfb.h"
  41.  
  42.  
  43. #if FEATURE_EXT_transform_feedback
  44.  
  45. #if 0
  46. static struct gl_transform_feedback_object *
  47. st_new_transform_feedback(struct gl_context *ctx, GLuint name)
  48. {
  49.    struct gl_transform_feedback_object *obj;
  50.    obj = CALLOC_STRUCT(gl_transform_feedback_object);
  51.    if (obj) {
  52.       obj->Name = name;
  53.       obj->RefCount = 1;
  54.    }
  55.    return obj;
  56. }
  57. #endif
  58.  
  59. #if 0
  60. static void
  61. st_delete_transform_feedback(struct gl_context *ctx,
  62.                              struct gl_transform_feedback_object *obj)
  63. {
  64.    GLuint i;
  65.  
  66.    for (i = 0; i < Elements(obj->Buffers); i++) {
  67.       _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
  68.    }
  69.  
  70.    free(obj);
  71. }
  72. #endif
  73.  
  74.  
  75. static void
  76. st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
  77.                             struct gl_transform_feedback_object *obj)
  78. {
  79.    /* to-do */
  80. }
  81.  
  82.  
  83. static void
  84. st_end_transform_feedback(struct gl_context *ctx,
  85.                           struct gl_transform_feedback_object *obj)
  86. {
  87.    /* to-do */
  88. }
  89.  
  90.  
  91. static void
  92. st_pause_transform_feedback(struct gl_context *ctx,
  93.                             struct gl_transform_feedback_object *obj)
  94. {
  95.    /* to-do */
  96. }
  97.  
  98.  
  99. static void
  100. st_resume_transform_feedback(struct gl_context *ctx,
  101.                              struct gl_transform_feedback_object *obj)
  102. {
  103.    /* to-do */
  104. }
  105.  
  106.  
  107. static void
  108. st_draw_transform_feedback(struct gl_context *ctx, GLenum mode,
  109.                            struct gl_transform_feedback_object *obj)
  110. {
  111.    /* XXX to do */
  112.    /*
  113.     * Get number of vertices in obj's feedback buffer.
  114.     * Call ctx->Exec.DrawArrays(mode, 0, count);
  115.     */
  116. }
  117.  
  118.  
  119. void
  120. st_init_xformfb_functions(struct dd_function_table *functions)
  121. {
  122.    /* let core Mesa plug in its functions */
  123.    _mesa_init_transform_feedback_functions(functions);
  124.  
  125.    /* then override a few: */
  126.    functions->BeginTransformFeedback = st_begin_transform_feedback;
  127.    functions->EndTransformFeedback = st_end_transform_feedback;
  128.    functions->PauseTransformFeedback = st_pause_transform_feedback;
  129.    functions->ResumeTransformFeedback = st_resume_transform_feedback;
  130.    functions->DrawTransformFeedback = st_draw_transform_feedback;
  131. }
  132.  
  133. #endif /* FEATURE_EXT_transform_feedback */
  134.