mirror of
https://github.com/reactos/reactos.git
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224 lines
6.1 KiB
C
224 lines
6.1 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file clear.c
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* glClearColor, glClearIndex, glClear() functions.
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*/
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#include <precomp.h>
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#if _HAVE_FULL_GL
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void GLAPIENTRY
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_mesa_ClearIndex( GLfloat c )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (ctx->Color.ClearIndex == (GLuint) c)
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return;
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FLUSH_VERTICES(ctx, _NEW_COLOR);
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ctx->Color.ClearIndex = (GLuint) c;
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}
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#endif
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/**
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* Specify the clear values for the color buffers.
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*
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* \param red red color component.
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* \param green green color component.
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* \param blue blue color component.
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* \param alpha alpha component.
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*
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* \sa glClearColor().
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*
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* Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
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* change, flushes the vertices and notifies the driver via the
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* dd_function_table::ClearColor callback.
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*/
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void GLAPIENTRY
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_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
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{
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GLfloat tmp[4];
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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tmp[0] = red;
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tmp[1] = green;
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tmp[2] = blue;
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tmp[3] = alpha;
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if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.f))
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return; /* no change */
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FLUSH_VERTICES(ctx, _NEW_COLOR);
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COPY_4V(ctx->Color.ClearColor.f, tmp);
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if (ctx->Driver.ClearColor) {
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/* it's OK to call glClearColor in CI mode but it should be a NOP */
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/* we pass the clamped color, since all drivers that need this don't
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* support GL_ARB_color_buffer_float
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*/
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(*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
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}
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}
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/**
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* GL_EXT_texture_integer
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*/
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void GLAPIENTRY
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_mesa_ClearColorIiEXT(GLint r, GLint g, GLint b, GLint a)
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{
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GLint tmp[4];
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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tmp[0] = r;
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tmp[1] = g;
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tmp[2] = b;
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tmp[3] = a;
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if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.i))
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return; /* no change */
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FLUSH_VERTICES(ctx, _NEW_COLOR);
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COPY_4V(ctx->Color.ClearColor.i, tmp);
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/* these should be NOP calls for drivers supporting EXT_texture_integer */
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if (ctx->Driver.ClearColor) {
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ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
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}
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}
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/**
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* GL_EXT_texture_integer
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*/
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void GLAPIENTRY
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_mesa_ClearColorIuiEXT(GLuint r, GLuint g, GLuint b, GLuint a)
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{
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GLuint tmp[4];
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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tmp[0] = r;
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tmp[1] = g;
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tmp[2] = b;
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tmp[3] = a;
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if (TEST_EQ_4V(tmp, ctx->Color.ClearColor.ui))
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return; /* no change */
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FLUSH_VERTICES(ctx, _NEW_COLOR);
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COPY_4V(ctx->Color.ClearColor.ui, tmp);
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/* these should be NOP calls for drivers supporting EXT_texture_integer */
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if (ctx->Driver.ClearColor) {
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ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
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}
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}
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/**
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* Clear buffers.
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*
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* \param mask bit-mask indicating the buffers to be cleared.
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*
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* Flushes the vertices and verifies the parameter. If __struct gl_contextRec::NewState
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* is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
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* etc. If the rasterization mode is set to GL_RENDER then requests the driver
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* to clear the buffers, via the dd_function_table::Clear callback.
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*/
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void GLAPIENTRY
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_mesa_Clear( GLbitfield mask )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
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FLUSH_CURRENT(ctx, 0);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glClear 0x%x\n", mask);
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if (mask & ~(GL_COLOR_BUFFER_BIT |
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GL_DEPTH_BUFFER_BIT |
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GL_STENCIL_BUFFER_BIT |
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GL_ACCUM_BUFFER_BIT)) {
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/* invalid bit set */
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_mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
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return;
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}
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if (ctx->NewState) {
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_mesa_update_state( ctx ); /* update _Xmin, etc */
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}
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if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||
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ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
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ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
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return;
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if (ctx->RasterDiscard)
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return;
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if (ctx->RenderMode == GL_RENDER) {
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GLbitfield bufferMask;
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/* don't clear depth buffer if depth writing disabled */
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if (!ctx->Depth.Mask)
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mask &= ~GL_DEPTH_BUFFER_BIT;
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/* Build the bitmask to send to device driver's Clear function.
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* Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
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* of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
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* BUFFER_BIT_COLORn flags.
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*/
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bufferMask = 0;
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if (mask & GL_COLOR_BUFFER_BIT) {
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bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndex);
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}
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if ((mask & GL_DEPTH_BUFFER_BIT)
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&& ctx->DrawBuffer->Visual.haveDepthBuffer) {
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bufferMask |= BUFFER_BIT_DEPTH;
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}
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if ((mask & GL_STENCIL_BUFFER_BIT)
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&& ctx->DrawBuffer->Visual.haveStencilBuffer) {
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bufferMask |= BUFFER_BIT_STENCIL;
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}
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if ((mask & GL_ACCUM_BUFFER_BIT)
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&& ctx->DrawBuffer->Visual.haveAccumBuffer) {
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bufferMask |= BUFFER_BIT_ACCUM;
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}
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ASSERT(ctx->Driver.Clear);
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ctx->Driver.Clear(ctx, bufferMask);
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}
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}
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