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      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
    121