src/mesa/state_tracker/st_cb_xformfb.c

   1 /**************************************************************************
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   3  * Copyright 2010 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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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 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 */