src/mesa/main/accum.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "glheader.h"
  26 #include "accum.h"
  27 #include "context.h"
  28 #include "imports.h"
  29 #include "macros.h"
  30 #include "mfeatures.h"
  31 #include "state.h"
  32 #include "mtypes.h"
  33 #include "main/dispatch.h"
  34
  35
  36 #if FEATURE_accum
  37
  38
  39 void GLAPIENTRY
  40 _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
  41 {
  42    GLfloat tmp[4];
  43    GET_CURRENT_CONTEXT(ctx);
  44    ASSERT_OUTSIDE_BEGIN_END(ctx);
  45
  46    tmp[0] = CLAMP( red,   -1.0F, 1.0F );
  47    tmp[1] = CLAMP( green, -1.0F, 1.0F );
  48    tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
  49    tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
  50
  51    if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
  52       return;
  53
  54    FLUSH_VERTICES(ctx, _NEW_ACCUM);
  55    COPY_4FV( ctx->Accum.ClearColor, tmp );
  56 }
  57
  58
  59 static void GLAPIENTRY
  60 _mesa_Accum( GLenum op, GLfloat value )
  61 {
  62    GET_CURRENT_CONTEXT(ctx);
  63    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  64
  65    switch (op) {
  66    case GL_ADD:
  67    case GL_MULT:
  68    case GL_ACCUM:
  69    case GL_LOAD:
  70    case GL_RETURN:
  71       /* OK */
  72       break;
  73    default:
  74       _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
  75       return;
  76    }
  77
  78    if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
  79       _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
  80       return;
  81    }
  82
  83    if (ctx->DrawBuffer != ctx->ReadBuffer) {
  84       /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
  85        * or GL_EXT_framebuffer_blit.
  86        */
  87       _mesa_error(ctx, GL_INVALID_OPERATION,
  88                   "glAccum(different read/draw buffers)");
  89       return;
  90    }
  91
  92    if (ctx->NewState)
  93       _mesa_update_state(ctx);
  94
  95    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  96       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
  97                   "glAccum(incomplete framebuffer)");
  98       return;
  99    }
 100
 101    if (ctx->RenderMode == GL_RENDER) {
 102       ctx->Driver.Accum(ctx, op, value);
 103    }
 104 }
 105
 106
 107 void
 108 _mesa_init_accum_dispatch(struct _glapi_table *disp)
 109 {
 110    SET_Accum(disp, _mesa_Accum);
 111    SET_ClearAccum(disp, _mesa_ClearAccum);
 112 }
 113
 114
 115 #endif /* FEATURE_accum */
 116
 117
 118 void
 119 _mesa_init_accum( struct gl_context *ctx )
 120 {
 121    /* Accumulate buffer group */
 122    ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
 123 }