src/mesa/state_tracker/st_cb_xformfb.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  13  *
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  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 0
  44 static struct gl_transform_feedback_object *
  45 st_new_transform_feedback(GLcontext *ctx, GLuint name)
  46 {
  47    struct gl_transform_feedback_object *obj;
  48    obj = CALLOC_STRUCT(gl_transform_feedback_object);
  49    if (obj) {
  50       obj->Name = name;
  51       obj->RefCount = 1;
  52    }
  53    return obj;
  54 }
  55 #endif
  56
  57 #if 0
  58 static void
  59 st_delete_transform_feedback(GLcontext *ctx,
  60                              struct gl_transform_feedback_object *obj)
  61 {
  62    GLuint i;
  63
  64    for (i = 0; i < Elements(obj->Buffers); i++) {
  65       _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
  66    }
  67
  68    free(obj);
  69 }
  70 #endif
  71
  72
  73 static void
  74 st_begin_transform_feedback(GLcontext *ctx, GLenum mode,
  75                             struct gl_transform_feedback_object *obj)
  76 {
  77    /* to-do */
  78 }
  79
  80
  81 static void
  82 st_end_transform_feedback(GLcontext *ctx,
  83                           struct gl_transform_feedback_object *obj)
  84 {
  85    /* to-do */
  86 }
  87
  88
  89 static void
  90 st_pause_transform_feedback(GLcontext *ctx,
  91                             struct gl_transform_feedback_object *obj)
  92 {
  93    /* to-do */
  94 }
  95
  96
  97 static void
  98 st_resume_transform_feedback(GLcontext *ctx,
  99                              struct gl_transform_feedback_object *obj)
 100 {
 101    /* to-do */
 102 }
 103
 104
 105 static void
 106 st_draw_transform_feedback(GLcontext *ctx, GLenum mode,
 107                            struct gl_transform_feedback_object *obj)
 108 {
 109    /* XXX to do */
 110    /*
 111     * Get number of vertices in obj's feedback buffer.
 112     * Call ctx->Exec.DrawArrays(mode, 0, count);
 113     */
 114 }
 115
 116
 117 void
 118 st_init_xformfb_functions(struct dd_function_table *functions)
 119 {
 120    /* let core Mesa plug in its functions */
 121    _mesa_init_transform_feedback_functions(functions);
 122
 123    /* then override a few: */
 124    functions->BeginTransformFeedback = st_begin_transform_feedback;
 125    functions->EndTransformFeedback = st_end_transform_feedback;
 126    functions->PauseTransformFeedback = st_pause_transform_feedback;
 127    functions->ResumeTransformFeedback = st_resume_transform_feedback;
 128    functions->DrawTransformFeedback = st_draw_transform_feedback;
 129 }