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, GLbitfield64 varying_inputs);
  43
  44
  45 extern void
  46 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag);
  47
  48
  49 /**
  50  * Is the secondary color needed?
  51  */
  52 static inline GLboolean
  53 _mesa_need_secondary_color(const struct gl_context *ctx)
  54 {
  55    if (ctx->Light.Enabled &&
  56        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
  57        return GL_TRUE;
  58
  59    if (ctx->Fog.ColorSumEnabled)
  60       return GL_TRUE;
  61
  62    if (ctx->VertexProgram._Current &&
  63        (ctx->VertexProgram._Current != ctx->VertexProgram._TnlProgram) &&
  64        (ctx->VertexProgram._Current->info.inputs_read & VERT_BIT_COLOR1))
  65       return GL_TRUE;
  66
  67    if (ctx->FragmentProgram._Current &&
  68        (ctx->FragmentProgram._Current != ctx->FragmentProgram._TexEnvProgram) &&
  69        (ctx->FragmentProgram._Current->info.inputs_read & VARYING_BIT_COL1))
  70       return GL_TRUE;
  71
  72    return GL_FALSE;
  73 }
  74
  75 static inline bool
  76 _mesa_arb_vertex_program_enabled(const struct gl_context *ctx)
  77 {
  78    return ctx->VertexProgram.Enabled &&
  79           ctx->VertexProgram.Current->arb.Instructions;
  80 }
  81
  82 /** Compute two sided lighting state for fixed function or programs. */
  83 static inline bool
  84 _mesa_vertex_program_two_side_enabled(const struct gl_context *ctx)
  85 {
  86    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX] ||
  87        _mesa_arb_vertex_program_enabled(ctx))
  88       return ctx->VertexProgram.TwoSideEnabled;
  89
  90    return ctx->Light.Enabled && ctx->Light.Model.TwoSide;
  91 }
  92
  93 /** Return 0=GL_CCW or 1=GL_CW */
  94 static inline bool
  95 _mesa_polygon_get_front_bit(const struct gl_context *ctx)
  96 {
  97    if (ctx->Transform.ClipOrigin == GL_LOWER_LEFT)
  98       return ctx->Polygon.FrontFace == GL_CW;
  99
 100    return ctx->Polygon.FrontFace == GL_CCW;
 101 }
 102
 103 static inline bool
 104 _mesa_arb_fragment_program_enabled(const struct gl_context *ctx)
 105 {
 106    return ctx->FragmentProgram.Enabled &&
 107           ctx->FragmentProgram.Current->arb.Instructions;
 108 }
 109
 110 static inline bool
 111 _mesa_ati_fragment_shader_enabled(const struct gl_context *ctx)
 112 {
 113    return ctx->ATIFragmentShader.Enabled &&
 114           ctx->ATIFragmentShader.Current->Instructions[0];
 115 }
 116
 117 #endif