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Diffstat (limited to 'src/mesa/main/clear.c')
| -rw-r--r-- | src/mesa/main/clear.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c new file mode 100644 index 00000000000..63388f42ee4 --- /dev/null +++ b/src/mesa/main/clear.c @@ -0,0 +1,184 @@ +/* + * Mesa 3-D graphics library + * Version: 7.1 + * + * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +/** + * \file clear.c + * glClearColor, glClearIndex, glClear() functions. + */ + + + +#include "glheader.h" +#include "clear.h" +#include "context.h" +#include "colormac.h" +#include "state.h" + + + +#if _HAVE_FULL_GL +void GLAPIENTRY +_mesa_ClearIndex( GLfloat c ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (ctx->Color.ClearIndex == (GLuint) c) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.ClearIndex = (GLuint) c; + + if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) { + /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */ + (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex ); + } +} +#endif + + +/** + * Specify the clear values for the color buffers. + * + * \param red red color component. + * \param green green color component. + * \param blue blue color component. + * \param alpha alpha component. + * + * \sa glClearColor(). + * + * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a + * change, flushes the vertices and notifies the driver via the + * dd_function_table::ClearColor callback. + */ +void GLAPIENTRY +_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha ) +{ + GLfloat tmp[4]; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + tmp[0] = CLAMP(red, 0.0F, 1.0F); + tmp[1] = CLAMP(green, 0.0F, 1.0F); + tmp[2] = CLAMP(blue, 0.0F, 1.0F); + tmp[3] = CLAMP(alpha, 0.0F, 1.0F); + + if (TEST_EQ_4V(tmp, ctx->Color.ClearColor)) + return; /* no change */ + + FLUSH_VERTICES(ctx, _NEW_COLOR); + COPY_4V(ctx->Color.ClearColor, tmp); + + if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) { + /* it's OK to call glClearColor in CI mode but it should be a NOP */ + (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor); + } +} + + +/** + * Clear buffers. + * + * \param mask bit-mask indicating the buffers to be cleared. + * + * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState + * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin, + * etc. If the rasterization mode is set to GL_RENDER then requests the driver + * to clear the buffers, via the dd_function_table::Clear callback. + */ +void GLAPIENTRY +_mesa_Clear( GLbitfield mask ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + + FLUSH_CURRENT(ctx, 0); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glClear 0x%x\n", mask); + + if (mask & ~(GL_COLOR_BUFFER_BIT | + GL_DEPTH_BUFFER_BIT | + GL_STENCIL_BUFFER_BIT | + GL_ACCUM_BUFFER_BIT)) { + /* invalid bit set */ + _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask); + return; + } + + if (ctx->NewState) { + _mesa_update_state( ctx ); /* update _Xmin, etc */ + } + + if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { + _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT, + "glClear(incomplete framebuffer)"); + return; + } + + if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 || + ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax || + ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax) + return; + + if (ctx->RenderMode == GL_RENDER) { + GLbitfield bufferMask; + + /* don't clear depth buffer if depth writing disabled */ + if (!ctx->Depth.Mask) + mask &= ~GL_DEPTH_BUFFER_BIT; + + /* Build the bitmask to send to device driver's Clear function. + * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4 + * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the + * BUFFER_BIT_COLORn flags. + */ + bufferMask = 0; + if (mask & GL_COLOR_BUFFER_BIT) { + GLuint i; + for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) { + bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]); + } + } + + if ((mask & GL_DEPTH_BUFFER_BIT) + && ctx->DrawBuffer->Visual.haveDepthBuffer) { + bufferMask |= BUFFER_BIT_DEPTH; + } + + if ((mask & GL_STENCIL_BUFFER_BIT) + && ctx->DrawBuffer->Visual.haveStencilBuffer) { + bufferMask |= BUFFER_BIT_STENCIL; + } + + if ((mask & GL_ACCUM_BUFFER_BIT) + && ctx->DrawBuffer->Visual.haveAccumBuffer) { + bufferMask |= BUFFER_BIT_ACCUM; + } + + ASSERT(ctx->Driver.Clear); + ctx->Driver.Clear(ctx, bufferMask); + } +} |