reactos/dll/opengl/mesa/src/mesa/main/clear.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  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
  26 /**
  27  * \file clear.c
  28  * glClearColor, glClearIndex, glClear() functions.
  29  */
  30
  31
  32
  33 #include "glheader.h"
  34 #include "clear.h"
  35 #include "context.h"
  36 #include "colormac.h"
  37 #include "enums.h"
  38 #include "macros.h"
  39 #include "mtypes.h"
  40 #include "state.h"
  41
  42
  43
  44 #if _HAVE_FULL_GL
  45 void GLAPIENTRY
  46 _mesa_ClearIndex( GLfloat c )
  47 {
  48    GET_CURRENT_CONTEXT(ctx);
  49    ASSERT_OUTSIDE_BEGIN_END(ctx);
  50
  51    if (ctx->Color.ClearIndex == (GLuint) c)
  52       return;
  53
  54    FLUSH_VERTICES(ctx, _NEW_COLOR);
  55    ctx->Color.ClearIndex = (GLuint) c;
  56 }
  57 #endif
  58
  59
  60 /**
  61  * Specify the clear values for the color buffers.
  62  *
  63  * \param red red color component.
  64  * \param green green color component.
  65  * \param blue blue color component.
  66  * \param alpha alpha component.
  67  *
  68  * \sa glClearColor().
  69  *
  70  * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor.  On a
  71  * change, flushes the vertices and notifies the driver via the
  72  * dd_function_table::ClearColor callback.
  73  */
  74 void GLAPIENTRY
  75 _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
  76 {
  77    GLfloat tmp[4];
  78    GET_CURRENT_CONTEXT(ctx);
  79    ASSERT_OUTSIDE_BEGIN_END(ctx);
  80
  81    tmp[0] = red;
  82    tmp[1] = green;
  83    tmp[2] = blue;
  84    tmp[3] = alpha;
  85
  86    if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.f))
  87       return; /* no change */
  88
  89    FLUSH_VERTICES(ctx, _NEW_COLOR);
  90    COPY_4V(ctx->Color.ClearColor.f, tmp);
  91
  92    if (ctx->Driver.ClearColor) {
  93       /* it's OK to call glClearColor in CI mode but it should be a NOP */
  94       /* we pass the clamped color, since all drivers that need this don't
  95        * support GL_ARB_color_buffer_float
  96        */
  97       (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
  98    }
  99 }
 100
 101
 102 /**
 103  * GL_EXT_texture_integer
 104  */
 105 void GLAPIENTRY
 106 _mesa_ClearColorIiEXT(GLint r, GLint g, GLint b, GLint a)
 107 {
 108    GLint tmp[4];
 109    GET_CURRENT_CONTEXT(ctx);
 110    ASSERT_OUTSIDE_BEGIN_END(ctx);
 111
 112    tmp[0] = r;
 113    tmp[1] = g;
 114    tmp[2] = b;
 115    tmp[3] = a;
 116
 117    if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.i))
 118       return; /* no change */
 119
 120    FLUSH_VERTICES(ctx, _NEW_COLOR);
 121    COPY_4V(ctx->Color.ClearColor.i, tmp);
 122
 123    /* these should be NOP calls for drivers supporting EXT_texture_integer */
 124    if (ctx->Driver.ClearColor) {
 125       ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
 126    }
 127 }
 128
 129
 130 /**
 131  * GL_EXT_texture_integer
 132  */
 133 void GLAPIENTRY
 134 _mesa_ClearColorIuiEXT(GLuint r, GLuint g, GLuint b, GLuint a)
 135 {
 136    GLuint tmp[4];
 137    GET_CURRENT_CONTEXT(ctx);
 138    ASSERT_OUTSIDE_BEGIN_END(ctx);
 139
 140    tmp[0] = r;
 141    tmp[1] = g;
 142    tmp[2] = b;
 143    tmp[3] = a;
 144
 145    if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.ui))
 146       return; /* no change */
 147
 148    FLUSH_VERTICES(ctx, _NEW_COLOR);
 149    COPY_4V(ctx->Color.ClearColor.ui, tmp);
 150
 151    /* these should be NOP calls for drivers supporting EXT_texture_integer */
 152    if (ctx->Driver.ClearColor) {
 153       ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
 154    }
 155 }
 156
 157
 158 /**
 159  * Clear buffers.
 160  *
 161  * \param mask bit-mask indicating the buffers to be cleared.
 162  *
 163  * Flushes the vertices and verifies the parameter. If __struct gl_contextRec::NewState
 164  * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
 165  * etc. If the rasterization mode is set to GL_RENDER then requests the driver
 166  * to clear the buffers, via the dd_function_table::Clear callback.
 167  */
 168 void GLAPIENTRY
 169 _mesa_Clear( GLbitfield mask )
 170 {
 171    GET_CURRENT_CONTEXT(ctx);
 172    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 173
 174    FLUSH_CURRENT(ctx, 0);
 175
 176    if (MESA_VERBOSE & VERBOSE_API)
 177       _mesa_debug(ctx, "glClear 0x%x\n", mask);
 178
 179    if (mask & ~(GL_COLOR_BUFFER_BIT |
 180                 GL_DEPTH_BUFFER_BIT |
 181                 GL_STENCIL_BUFFER_BIT |
 182                 GL_ACCUM_BUFFER_BIT)) {
 183       /* invalid bit set */
 184       _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
 185       return;
 186    }
 187
 188    if (ctx->NewState) {
 189       _mesa_update_state( ctx );        /* update _Xmin, etc */
 190    }
 191
 192    if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||
 193        ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
 194        ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
 195       return;
 196
 197    if (ctx->RasterDiscard)
 198       return;
 199
 200    if (ctx->RenderMode == GL_RENDER) {
 201       GLbitfield bufferMask;
 202
 203       /* don't clear depth buffer if depth writing disabled */
 204       if (!ctx->Depth.Mask)
 205          mask &= ~GL_DEPTH_BUFFER_BIT;
 206
 207       /* Build the bitmask to send to device driver's Clear function.
 208        * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
 209        * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
 210        * BUFFER_BIT_COLORn flags.
 211        */
 212       bufferMask = 0;
 213       if (mask & GL_COLOR_BUFFER_BIT) {
 214          bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndex);
 215       }
 216
 217       if ((mask & GL_DEPTH_BUFFER_BIT)
 218           && ctx->DrawBuffer->Visual.haveDepthBuffer) {
 219          bufferMask |= BUFFER_BIT_DEPTH;
 220       }
 221
 222       if ((mask & GL_STENCIL_BUFFER_BIT)
 223           && ctx->DrawBuffer->Visual.haveStencilBuffer) {
 224          bufferMask |= BUFFER_BIT_STENCIL;
 225       }
 226
 227       if ((mask & GL_ACCUM_BUFFER_BIT)
 228           && ctx->DrawBuffer->Visual.haveAccumBuffer) {
 229          bufferMask |= BUFFER_BIT_ACCUM;
 230       }
 231
 232       ASSERT(ctx->Driver.Clear);
 233       ctx->Driver.Clear(ctx, bufferMask);
 234    }
 235 }