src/gallium/auxiliary/draw/draw_gs.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  26  **************************************************************************/
  27
  28 #ifndef DRAW_GS_H
  29 #define DRAW_GS_H
  30
  31 #include "draw_context.h"
  32 #include "draw_private.h"
  33
  34
  35 #define MAX_TGSI_PRIMITIVES 4
  36
  37 struct draw_context;
  38
  39 /**
  40  * Private version of the compiled geometry shader
  41  */
  42 struct draw_geometry_shader {
  43    struct draw_context *draw;
  44
  45    struct tgsi_exec_machine *machine;
  46
  47    /* This member will disappear shortly:*/
  48    struct pipe_shader_state state;
  49
  50    struct tgsi_shader_info info;
  51    unsigned position_output;
  52
  53    unsigned max_output_vertices;
  54    unsigned input_primitive;
  55    unsigned output_primitive;
  56
  57    unsigned emitted_vertices;
  58    unsigned emitted_primitives;
  59
  60    /* Extracted from shader:
  61     */
  62    const float (*immediates)[4];
  63 };
  64
  65 /*
  66  * Returns the number of vertices emitted.
  67  * The vertex shader can emit any number of vertices as long as it's
  68  * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
  69  */
  70 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
  71                              const float (*input)[4],
  72                              float (*output)[4],
  73                              const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
  74                              unsigned count,
  75                              unsigned input_stride,
  76                              unsigned output_stride);
  77
  78 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
  79                                   struct draw_context *draw);
  80
  81 void draw_geometry_shader_delete(struct draw_geometry_shader *shader);
  82
  83
  84 #endif