src/mesa/drivers/dri/i965/brw_vs.h

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #ifndef BRW_VS_H
  34 #define BRW_VS_H
  35
  36
  37 #include "brw_context.h"
  38 #include "brw_eu.h"
  39 #include "program/program.h"
  40
  41
  42 struct brw_vs_prog_key {
  43    GLuint program_string_id;
  44    /**
  45     * Number of channels of the vertex attribute that need GL_FIXED rescaling
  46     */
  47    uint8_t gl_fixed_input_size[VERT_ATTRIB_MAX];
  48
  49    /**
  50     * True if at least one clip flag is enabled, regardless of whether the
  51     * shader uses clip planes or gl_ClipDistance.
  52     */
  53    GLuint userclip_active:1;
  54
  55    /**
  56     * How many user clipping planes are being uploaded to the vertex shader as
  57     * push constants.
  58     */
  59    GLuint nr_userclip_plane_consts:4;
  60
  61    /**
  62     * True if the shader uses gl_ClipDistance, regardless of whether any clip
  63     * flags are enabled.
  64     */
  65    GLuint uses_clip_distance:1;
  66
  67    /**
  68     * For pre-Gen6 hardware, a bitfield indicating which clipping planes are
  69     * enabled.  This is used to compact clip planes.
  70     *
  71     * For Gen6 and later hardware, clip planes are not compacted, so this
  72     * value is zero to avoid provoking unnecessary shader recompiles.
  73     */
  74    GLuint userclip_planes_enabled_gen_4_5:MAX_CLIP_PLANES;
  75
  76    GLuint copy_edgeflag:1;
  77    GLuint point_coord_replace:8;
  78    GLuint clamp_vertex_color:1;
  79 };
  80
  81
  82 struct brw_vs_compile {
  83    struct brw_compile func;
  84    struct brw_vs_prog_key key;
  85    struct brw_vs_prog_data prog_data;
  86    int8_t constant_map[1024];
  87
  88    struct brw_vertex_program *vp;
  89
  90    GLuint nr_inputs;
  91
  92    struct brw_vue_map vue_map;
  93    GLuint first_output;
  94    GLuint last_scratch;
  95
  96    GLuint first_tmp;
  97    GLuint last_tmp;
  98
  99    struct brw_reg r0;
 100    struct brw_reg r1;
 101    struct brw_reg regs[PROGRAM_ADDRESS+1][128];
 102    struct brw_reg tmp;
 103    struct brw_reg stack;
 104
 105    struct {
 106        bool used_in_src;
 107        struct brw_reg reg;
 108    } output_regs[128];
 109
 110    struct brw_reg userplane[MAX_CLIP_PLANES];
 111
 112    /** we may need up to 3 constants per instruction (if use_const_buffer) */
 113    struct {
 114       GLint index;
 115       struct brw_reg reg;
 116    } current_const[3];
 117
 118    bool needs_stack;
 119 };
 120
 121 bool brw_vs_emit(struct gl_shader_program *prog, struct brw_vs_compile *c);
 122 void brw_old_vs_emit(struct brw_vs_compile *c);
 123 bool brw_vs_precompile(struct gl_context *ctx, struct gl_shader_program *prog);
 124
 125 #endif