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