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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
  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 TUNGSTEN GRAPHICS 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. /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29.  */
  30.  
  31. #ifndef SP_QUAD_H
  32. #define SP_QUAD_H
  33.  
  34. #include "pipe/p_state.h"
  35. #include "tgsi/tgsi_exec.h"
  36.  
  37.  
  38. #define QUAD_PRIM_POINT 1
  39. #define QUAD_PRIM_LINE  2
  40. #define QUAD_PRIM_TRI   3
  41.  
  42.  
  43. /* The rasterizer generates 2x2 quads of fragment and feeds them to
  44.  * the current fp_machine (see below).
  45.  * Remember that Y=0=top with Y increasing down the window.
  46.  */
  47. #define QUAD_TOP_LEFT     0
  48. #define QUAD_TOP_RIGHT    1
  49. #define QUAD_BOTTOM_LEFT  2
  50. #define QUAD_BOTTOM_RIGHT 3
  51.  
  52. #define MASK_TOP_LEFT     (1 << QUAD_TOP_LEFT)
  53. #define MASK_TOP_RIGHT    (1 << QUAD_TOP_RIGHT)
  54. #define MASK_BOTTOM_LEFT  (1 << QUAD_BOTTOM_LEFT)
  55. #define MASK_BOTTOM_RIGHT (1 << QUAD_BOTTOM_RIGHT)
  56. #define MASK_ALL          0xf
  57.  
  58.  
  59. /**
  60.  * Quad stage inputs (pos, coverage, front/back face, etc)
  61.  */
  62. struct quad_header_input
  63. {
  64.    int x0, y0;                /**< quad window pos, always even */
  65.    float coverage[TGSI_QUAD_SIZE]; /**< fragment coverage for antialiasing */
  66.    unsigned facing:1;         /**< Front (0) or back (1) facing? */
  67.    unsigned prim:2;           /**< QUAD_PRIM_POINT, LINE, TRI */
  68. };
  69.  
  70.  
  71. /**
  72.  * Quad stage inputs/outputs.
  73.  */
  74. struct quad_header_inout
  75. {
  76.    unsigned mask:4;
  77. };
  78.  
  79.  
  80. /**
  81.  * Quad stage outputs (color & depth).
  82.  */
  83. struct quad_header_output
  84. {
  85.    /** colors in SOA format (rrrr, gggg, bbbb, aaaa) */
  86.    float color[PIPE_MAX_COLOR_BUFS][TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE];
  87.    float depth[TGSI_QUAD_SIZE];
  88.    uint8_t stencil[TGSI_QUAD_SIZE];
  89. };
  90.  
  91.  
  92. /**
  93.  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  94.  * "Channel-Serial" or "SoA" layout.  
  95.  */
  96. struct quad_header {
  97.    struct quad_header_input input;
  98.    struct quad_header_inout inout;
  99.    struct quad_header_output output;
  100.  
  101.    /* Redundant/duplicated:
  102.     */
  103.    const struct tgsi_interp_coef *posCoef;
  104.    const struct tgsi_interp_coef *coef;
  105. };
  106.  
  107. #endif /* SP_QUAD_H */
  108.