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 "state.h"
  31 #include "mtypes.h"
  32 #include "main/dispatch.h"
  33
  34
  35 #if FEATURE_accum
  36
  37
  38 void GLAPIENTRY
  39 _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
  40 {
  41    GLfloat tmp[4];
  42    GET_CURRENT_CONTEXT(ctx);
  43    ASSERT_OUTSIDE_BEGIN_END(ctx);
  44
  45    tmp[0] = CLAMP( red,   -1.0F, 1.0F );
  46    tmp[1] = CLAMP( green, -1.0F, 1.0F );
  47    tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
  48    tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
  49
  50    if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
  51       return;
  52
  53    FLUSH_VERTICES(ctx, _NEW_ACCUM);
  54    COPY_4FV( ctx->Accum.ClearColor, tmp );
  55 }
  56
  57
  58 static void GLAPIENTRY
  59 _mesa_Accum( GLenum op, GLfloat value )
  60 {
  61    GET_CURRENT_CONTEXT(ctx);
  62    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  63
  64    switch (op) {
  65    case GL_ADD:
  66    case GL_MULT:
  67    case GL_ACCUM:
  68    case GL_LOAD:
  69    case GL_RETURN:
  70       /* OK */
  71       break;
  72    default:
  73       _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
  74       return;
  75    }
  76
  77    if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
  78       _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
  79       return;
  80    }
  81
  82    if (ctx->DrawBuffer != ctx->ReadBuffer) {
  83       /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
  84        * or GL_EXT_framebuffer_blit.
  85        */
  86       _mesa_error(ctx, GL_INVALID_OPERATION,
  87                   "glAccum(different read/draw buffers)");
  88       return;
  89    }
  90
  91    if (ctx->NewState)
  92       _mesa_update_state(ctx);
  93
  94    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  95       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
  96                   "glAccum(incomplete framebuffer)");
  97       return;
  98    }
  99
 100    if (ctx->RenderMode == GL_RENDER) {
 101       ctx->Driver.Accum(ctx, op, value);
 102    }
 103 }
 104
 105
 106 void
 107 _mesa_init_accum_dispatch(struct _glapi_table *disp)
 108 {
 109    SET_Accum(disp, _mesa_Accum);
 110    SET_ClearAccum(disp, _mesa_ClearAccum);
 111 }
 112
 113
 114 #endif /* FEATURE_accum */
 115
 116
 117 void
 118 _mesa_init_accum( struct gl_context *ctx )
 119 {
 120    /* Accumulate buffer group */
 121    ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
 122 }