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Diffstat (limited to 'src/mesa/main/buffers.c')
| -rw-r--r-- | src/mesa/main/buffers.c | 620 |
1 files changed, 620 insertions, 0 deletions
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c new file mode 100644 index 0000000..4c5c077 --- /dev/null +++ b/src/mesa/main/buffers.c @@ -0,0 +1,620 @@ +/** + * \file buffers.c + * Frame buffer management. + */ + +/* + * Mesa 3-D graphics library + * Version: 6.1 + * + * Copyright (C) 1999-2004 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. + */ + + +#include "glheader.h" +#include "imports.h" +#include "buffers.h" +#include "colormac.h" +#include "context.h" +#include "depth.h" +#include "enums.h" +#include "stencil.h" +#include "state.h" +#include "mtypes.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); + + 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->RenderMode==GL_RENDER) { + const GLint x = ctx->DrawBuffer->_Xmin; + const GLint y = ctx->DrawBuffer->_Ymin; + const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin; + const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin; + GLbitfield ddMask; + + /* 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 FRONT/BACK_LEFT/RIGHT_BIT flags. + */ + ddMask = 0; + if (mask & GL_COLOR_BUFFER_BIT) + ddMask |= ctx->Color._DrawDestMask; + if ((mask & GL_DEPTH_BUFFER_BIT) && ctx->Visual.depthBits > 0) + ddMask |= GL_DEPTH_BUFFER_BIT; + if ((mask & GL_STENCIL_BUFFER_BIT) && ctx->Visual.stencilBits > 0) + ddMask |= GL_STENCIL_BUFFER_BIT; + if ((mask & GL_ACCUM_BUFFER_BIT) && ctx->Visual.accumRedBits > 0) + ddMask |= GL_ACCUM_BUFFER_BIT; + + ASSERT(ctx->Driver.Clear); + ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled, + x, y, width, height ); + } +} + + +/** + * Specify which color buffers to draw into. + * + * \param mode color buffer combination. + * + * \sa glDrawBuffer(). + * + * Flushes the vertices and verifies the parameter and updates the + * gl_colorbuffer_attrib::_DrawDestMask bitfield. Marks new color state in + * __GLcontextRec::NewState and notifies the driver via the + * dd_function_table::DrawBuffer callback. + */ +void GLAPIENTRY +_mesa_DrawBuffer( GLenum mode ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */ + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); + + /* + * Do error checking and compute the _DrawDestMask bitfield. + */ + switch (mode) { + case GL_FRONT: + /* never an error */ + if (ctx->Visual.stereoMode) + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_FRONT_RIGHT_BIT; + else + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; + break; + case GL_BACK: + if (!ctx->Visual.doubleBufferMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK)"); + return; + } + if (ctx->Visual.stereoMode) + ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT | DD_BACK_RIGHT_BIT; + else + ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT; + break; + case GL_NONE: + /* never an error */ + ctx->Color._DrawDestMask = 0; + break; +#if _HAVE_FULL_GL + case GL_RIGHT: + if (!ctx->Visual.stereoMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_RIGHT)"); + return;} + if (ctx->Visual.doubleBufferMode) + ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; + else + ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT; + break; + case GL_FRONT_RIGHT: + if (!ctx->Visual.stereoMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_RIGHT)"); + return; + } + ctx->Color._DrawDestMask = DD_FRONT_RIGHT_BIT; + break; + case GL_BACK_RIGHT: + if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_RIGHT)"); + return; + } + ctx->Color._DrawDestMask = DD_BACK_RIGHT_BIT; + break; + case GL_BACK_LEFT: + if (!ctx->Visual.doubleBufferMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_LEFT)"); + return; + } + ctx->Color._DrawDestMask = DD_BACK_LEFT_BIT; + break; + case GL_FRONT_AND_BACK: + if (!ctx->Visual.doubleBufferMode) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_AND_BACK)"); + return; + } + if (ctx->Visual.stereoMode) + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT + | DD_FRONT_RIGHT_BIT | DD_BACK_RIGHT_BIT; + else + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT; + break; + case GL_LEFT: + /* never an error */ + if (ctx->Visual.doubleBufferMode) + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT; + else + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; + break; + case GL_FRONT_LEFT: + /* never an error */ + ctx->Color._DrawDestMask = DD_FRONT_LEFT_BIT; + break; + case GL_AUX0: + if (ctx->Visual.numAuxBuffers >= 1) { + ctx->Color._DrawDestMask = DD_AUX0_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" ); + return; + } + break; + case GL_AUX1: + if (ctx->Visual.numAuxBuffers >= 2) { + ctx->Color._DrawDestMask = DD_AUX1_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" ); + return; + } + break; + case GL_AUX2: + if (ctx->Visual.numAuxBuffers >= 3) { + ctx->Color._DrawDestMask = DD_AUX2_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" ); + return; + } + break; + case GL_AUX3: + if (ctx->Visual.numAuxBuffers >= 4) { + ctx->Color._DrawDestMask = DD_AUX3_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" ); + return; + } + break; +#endif + default: + _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" ); + return; + } + + ctx->Color.DrawBuffer = mode; + ctx->NewState |= _NEW_COLOR; + + /* + * Call device driver function. + */ + if (ctx->Driver.DrawBuffer) + (*ctx->Driver.DrawBuffer)(ctx, mode); +} + + +/** + * Set the color buffer source for reading pixels. + * + * \param mode color buffer. + * + * \sa glReadBuffer(). + * + * Verifies the parameter and updates gl_pixel_attrib::_ReadSrcMask. Marks + * new pixel state in __GLcontextRec::NewState and notifies the driver via + * dd_function_table::ReadBuffer. + */ +void GLAPIENTRY +_mesa_ReadBuffer( GLenum mode ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); + + /* + * Do error checking and compute ctx->Pixel._ReadSrcMask. + */ + switch (mode) { + case GL_LEFT: + case GL_FRONT: + case GL_FRONT_LEFT: + /* Front-Left buffer, always exists */ + ctx->Pixel._ReadSrcMask = DD_FRONT_LEFT_BIT; + break; + case GL_BACK: + case GL_BACK_LEFT: + /* Back-Left buffer, requires double buffering */ + if (!ctx->Visual.doubleBufferMode) { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + return; + } + ctx->Pixel._ReadSrcMask = DD_BACK_LEFT_BIT; + break; +#if _HAVE_FULL_GL + case GL_FRONT_RIGHT: + case GL_RIGHT: + if (!ctx->Visual.stereoMode) { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + return; + } + ctx->Pixel._ReadSrcMask = DD_FRONT_RIGHT_BIT; + break; + case GL_BACK_RIGHT: + if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + return; + } + ctx->Pixel._ReadSrcMask = DD_BACK_RIGHT_BIT; + break; + case GL_AUX0: + if (ctx->Visual.numAuxBuffers >= 1) { + ctx->Pixel._ReadSrcMask = DD_AUX0_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" ); + return; + } + break; + case GL_AUX1: + if (ctx->Visual.numAuxBuffers >= 2) { + ctx->Pixel._ReadSrcMask = DD_AUX1_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" ); + return; + } + break; + case GL_AUX2: + if (ctx->Visual.numAuxBuffers >= 3) { + ctx->Pixel._ReadSrcMask = DD_AUX2_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" ); + return; + } + break; + case GL_AUX3: + if (ctx->Visual.numAuxBuffers >= 4) { + ctx->Pixel._ReadSrcMask = DD_AUX3_BIT; + } + else { + _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" ); + return; + } + break; +#endif + default: + _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" ); + return; + } + + ctx->Pixel.ReadBuffer = mode; + ctx->NewState |= _NEW_PIXEL; + + /* + * Call device driver function. + */ + if (ctx->Driver.ReadBuffer) + (*ctx->Driver.ReadBuffer)(ctx, mode); +} + +#if _HAVE_FULL_GL + +/** + * GL_MESA_resize_buffers extension. + * + * When this function is called, we'll ask the window system how large + * the current window is. If it's a new size, we'll call the driver's + * ResizeBuffers function. The driver will then resize its color buffers + * as needed, and maybe call the swrast's routine for reallocating + * swrast-managed depth/stencil/accum/etc buffers. + * \note This function may be called from within Mesa or called by the + * user directly (see the GL_MESA_resize_buffers extension). + */ +void GLAPIENTRY +_mesa_ResizeBuffersMESA( void ) +{ + GET_CURRENT_CONTEXT(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glResizeBuffersMESA\n"); + + if (ctx) { + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); + + if (ctx->DrawBuffer) { + GLuint buf_width, buf_height; + GLframebuffer *buffer = ctx->DrawBuffer; + + /* ask device driver for size of output buffer */ + (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height ); + + /* see if size of device driver's color buffer (window) has changed */ + if (buffer->Width == buf_width && buffer->Height == buf_height) + return; /* size is as expected */ + + buffer->Width = buf_width; + buffer->Height = buf_height; + + ctx->Driver.ResizeBuffers( buffer ); + } + + if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) { + GLuint buf_width, buf_height; + GLframebuffer *buffer = ctx->ReadBuffer; + + /* ask device driver for size of read buffer */ + (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height ); + + /* see if size of device driver's color buffer (window) has changed */ + if (buffer->Width == buf_width && buffer->Height == buf_height) + return; /* size is as expected */ + + buffer->Width = buf_width; + buffer->Height = buf_height; + + ctx->Driver.ResizeBuffers( buffer ); + } + + ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */ + } +} + +/* + * XXX move somewhere else someday? + */ +void GLAPIENTRY +_mesa_SampleCoverageARB(GLclampf value, GLboolean invert) +{ + GET_CURRENT_CONTEXT(ctx); + + if (!ctx->Extensions.ARB_multisample) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB"); + return; + } + + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); + ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0); + ctx->Multisample.SampleCoverageInvert = invert; + ctx->NewState |= _NEW_MULTISAMPLE; +} + +#endif + + +/** + * Define the scissor box. + * + * \param x, y coordinates of the scissor box lower-left corner. + * \param width width of the scissor box. + * \param height height of the scissor box. + * + * \sa glScissor(). + * + * Verifies the parameters and updates __GLcontextRec::Scissor. On a + * change flushes the vertices and notifies the driver via + * the dd_function_table::Scissor callback. + */ +void GLAPIENTRY +_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (width < 0 || height < 0) { + _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" ); + return; + } + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height); + + if (x == ctx->Scissor.X && + y == ctx->Scissor.Y && + width == ctx->Scissor.Width && + height == ctx->Scissor.Height) + return; + + FLUSH_VERTICES(ctx, _NEW_SCISSOR); + ctx->Scissor.X = x; + ctx->Scissor.Y = y; + ctx->Scissor.Width = width; + ctx->Scissor.Height = height; + + if (ctx->Driver.Scissor) + ctx->Driver.Scissor( ctx, x, y, width, height ); +} + +/**********************************************************************/ +/** \name State management */ +/*@{*/ + +/** + * Update screen bounds. + * + * \param ctx GL context. + * + * Update gl_frame_buffer::_Xmin, and etc. + */ +void _mesa_update_buffers( GLcontext *ctx ) +{ + ctx->DrawBuffer->_Xmin = 0; + ctx->DrawBuffer->_Ymin = 0; + ctx->DrawBuffer->_Xmax = ctx->DrawBuffer->Width; + ctx->DrawBuffer->_Ymax = ctx->DrawBuffer->Height; + if (ctx->Scissor.Enabled) { + if (ctx->Scissor.X > ctx->DrawBuffer->_Xmin) { + ctx->DrawBuffer->_Xmin = ctx->Scissor.X; + } + if (ctx->Scissor.Y > ctx->DrawBuffer->_Ymin) { + ctx->DrawBuffer->_Ymin = ctx->Scissor.Y; + } + if (ctx->Scissor.X + ctx->Scissor.Width < ctx->DrawBuffer->_Xmax) { + ctx->DrawBuffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width; + } + if (ctx->Scissor.Y + ctx->Scissor.Height < ctx->DrawBuffer->_Ymax) { + ctx->DrawBuffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height; + } + } +} + +/*@}*/ + + +/**********************************************************************/ +/** \name Initialization */ +/*@{*/ + +/** + * Initialize the context scissor data. + * + * \param ctx GL context. + * + * Initializes the __GLcontextRec::Scissor and __GLcontextRec::Multisample + * attribute groups, and related constants in __GLcontextRec::Const. + */ +void _mesa_init_buffers( GLcontext * ctx ) +{ + /* Scissor group */ + ctx->Scissor.Enabled = GL_FALSE; + ctx->Scissor.X = 0; + ctx->Scissor.Y = 0; + ctx->Scissor.Width = 0; + ctx->Scissor.Height = 0; + + /* Multisample */ + ctx->Multisample.Enabled = GL_FALSE; + ctx->Multisample.SampleAlphaToCoverage = GL_FALSE; + ctx->Multisample.SampleAlphaToOne = GL_FALSE; + ctx->Multisample.SampleCoverage = GL_FALSE; + ctx->Multisample.SampleCoverageValue = 1.0; + ctx->Multisample.SampleCoverageInvert = GL_FALSE; + +} + +/*@}*/ |