src/mesa/main/state.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #ifndef STATE_H
  27 #define STATE_H
  28
  29 #include "mtypes.h"
  30
  31 extern void
  32 _mesa_update_state(struct gl_context *ctx);
  33
  34 /* As above but can only be called between _mesa_lock_context_textures() and
  35  * _mesa_unlock_context_textures().
  36  */
  37 extern void
  38 _mesa_update_state_locked(struct gl_context *ctx);
  39
  40
  41 extern void
  42 _mesa_set_varying_vp_inputs(struct gl_context *ctx, GLbitfield varying_inputs);
  43
  44
  45 extern void
  46 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag);
  47
  48
  49 static inline bool
  50 _mesa_ati_fragment_shader_enabled(const struct gl_context *ctx)
  51 {
  52    return ctx->ATIFragmentShader.Enabled &&
  53           ctx->ATIFragmentShader.Current->Instructions[0];
  54 }
  55
  56 /**
  57  * Is the secondary color needed?
  58  */
  59 static inline GLboolean
  60 _mesa_need_secondary_color(const struct gl_context *ctx)
  61 {
  62    if (ctx->Light.Enabled &&
  63        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
  64        return GL_TRUE;
  65
  66    if (ctx->Fog.ColorSumEnabled)
  67       return GL_TRUE;
  68
  69    if (ctx->VertexProgram._Current &&
  70        (ctx->VertexProgram._Current != ctx->VertexProgram._TnlProgram) &&
  71        (ctx->VertexProgram._Current->info.inputs_read & VERT_BIT_COLOR1))
  72       return GL_TRUE;
  73
  74    if (ctx->FragmentProgram._Current &&
  75        (ctx->FragmentProgram._Current != ctx->FragmentProgram._TexEnvProgram) &&
  76        (ctx->FragmentProgram._Current->info.inputs_read & VARYING_BIT_COL1))
  77       return GL_TRUE;
  78
  79    if (_mesa_ati_fragment_shader_enabled(ctx))
  80       return GL_TRUE;
  81
  82    return GL_FALSE;
  83 }
  84
  85 static inline bool
  86 _mesa_arb_vertex_program_enabled(const struct gl_context *ctx)
  87 {
  88    return ctx->VertexProgram.Enabled &&
  89           ctx->VertexProgram.Current->arb.Instructions;
  90 }
  91
  92 /** Compute two sided lighting state for fixed function or programs. */
  93 static inline bool
  94 _mesa_vertex_program_two_side_enabled(const struct gl_context *ctx)
  95 {
  96    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX] ||
  97        _mesa_arb_vertex_program_enabled(ctx))
  98       return ctx->VertexProgram.TwoSideEnabled;
  99
 100    return ctx->Light.Enabled && ctx->Light.Model.TwoSide;
 101 }
 102
 103 /** Return 0=GL_CCW or 1=GL_CW */
 104 static inline bool
 105 _mesa_polygon_get_front_bit(const struct gl_context *ctx)
 106 {
 107    if (ctx->Transform.ClipOrigin == GL_LOWER_LEFT)
 108       return ctx->Polygon.FrontFace == GL_CW;
 109
 110    return ctx->Polygon.FrontFace == GL_CCW;
 111 }
 112
 113 static inline bool
 114 _mesa_arb_fragment_program_enabled(const struct gl_context *ctx)
 115 {
 116    return ctx->FragmentProgram.Enabled &&
 117           ctx->FragmentProgram.Current->arb.Instructions;
 118 }
 119
 120 #endif