From 807c6931fe683fd844ceec1b023232181e6aae03 Mon Sep 17 00:00:00 2001 From: marha Date: Tue, 28 Dec 2010 16:10:20 +0000 Subject: xserver and mesa git update 28-12-2010 --- mesalib/src/mesa/main/buffers.c | 1050 +++++++++++++++++++-------------------- 1 file changed, 525 insertions(+), 525 deletions(-) (limited to 'mesalib/src/mesa/main/buffers.c') diff --git a/mesalib/src/mesa/main/buffers.c b/mesalib/src/mesa/main/buffers.c index fb30b5996..cdc174454 100644 --- a/mesalib/src/mesa/main/buffers.c +++ b/mesalib/src/mesa/main/buffers.c @@ -1,525 +1,525 @@ -/* - * 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 buffers.c - * glReadBuffer, DrawBuffer functions. - */ - - - -#include "glheader.h" -#include "buffers.h" -#include "colormac.h" -#include "context.h" -#include "enums.h" - - -#define BAD_MASK ~0u - - -/** - * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are - * available to the rendering context (for drawing or reading). - * This depends on the type of framebuffer. For window system framebuffers - * we look at the framebuffer's visual. But for user-create framebuffers we - * look at the number of supported color attachments. - * \param fb the framebuffer to draw to, or read from - * \return bitmask of BUFFER_BIT_* flags - */ -static GLbitfield -supported_buffer_bitmask(const GLcontext *ctx, const struct gl_framebuffer *fb) -{ - GLbitfield mask = 0x0; - - if (fb->Name > 0) { - /* A user-created renderbuffer */ - GLuint i; - ASSERT(ctx->Extensions.EXT_framebuffer_object); - for (i = 0; i < ctx->Const.MaxColorAttachments; i++) { - mask |= (BUFFER_BIT_COLOR0 << i); - } - } - else { - /* A window system framebuffer */ - GLint i; - mask = BUFFER_BIT_FRONT_LEFT; /* always have this */ - if (fb->Visual.stereoMode) { - mask |= BUFFER_BIT_FRONT_RIGHT; - if (fb->Visual.doubleBufferMode) { - mask |= BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT; - } - } - else if (fb->Visual.doubleBufferMode) { - mask |= BUFFER_BIT_BACK_LEFT; - } - - for (i = 0; i < fb->Visual.numAuxBuffers; i++) { - mask |= (BUFFER_BIT_AUX0 << i); - } - } - - return mask; -} - - -/** - * Helper routine used by glDrawBuffer and glDrawBuffersARB. - * Given a GLenum naming one or more color buffers (such as - * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags. - */ -static GLbitfield -draw_buffer_enum_to_bitmask(GLenum buffer) -{ - switch (buffer) { - case GL_NONE: - return 0; - case GL_FRONT: - return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT; - case GL_BACK: - return BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT; - case GL_RIGHT: - return BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; - case GL_FRONT_RIGHT: - return BUFFER_BIT_FRONT_RIGHT; - case GL_BACK_RIGHT: - return BUFFER_BIT_BACK_RIGHT; - case GL_BACK_LEFT: - return BUFFER_BIT_BACK_LEFT; - case GL_FRONT_AND_BACK: - return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT - | BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; - case GL_LEFT: - return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT; - case GL_FRONT_LEFT: - return BUFFER_BIT_FRONT_LEFT; - case GL_AUX0: - return BUFFER_BIT_AUX0; - case GL_AUX1: - case GL_AUX2: - case GL_AUX3: - return 1 << BUFFER_COUNT; /* invalid, but not BAD_MASK */ - case GL_COLOR_ATTACHMENT0_EXT: - return BUFFER_BIT_COLOR0; - case GL_COLOR_ATTACHMENT1_EXT: - return BUFFER_BIT_COLOR1; - case GL_COLOR_ATTACHMENT2_EXT: - return BUFFER_BIT_COLOR2; - case GL_COLOR_ATTACHMENT3_EXT: - return BUFFER_BIT_COLOR3; - case GL_COLOR_ATTACHMENT4_EXT: - return BUFFER_BIT_COLOR4; - case GL_COLOR_ATTACHMENT5_EXT: - return BUFFER_BIT_COLOR5; - case GL_COLOR_ATTACHMENT6_EXT: - return BUFFER_BIT_COLOR6; - case GL_COLOR_ATTACHMENT7_EXT: - return BUFFER_BIT_COLOR7; - default: - /* error */ - return BAD_MASK; - } -} - - -/** - * Helper routine used by glReadBuffer. - * Given a GLenum naming a color buffer, return the index of the corresponding - * renderbuffer (a BUFFER_* value). - * return -1 for an invalid buffer. - */ -static GLint -read_buffer_enum_to_index(GLenum buffer) -{ - switch (buffer) { - case GL_FRONT: - return BUFFER_FRONT_LEFT; - case GL_BACK: - return BUFFER_BACK_LEFT; - case GL_RIGHT: - return BUFFER_FRONT_RIGHT; - case GL_FRONT_RIGHT: - return BUFFER_FRONT_RIGHT; - case GL_BACK_RIGHT: - return BUFFER_BACK_RIGHT; - case GL_BACK_LEFT: - return BUFFER_BACK_LEFT; - case GL_LEFT: - return BUFFER_FRONT_LEFT; - case GL_FRONT_LEFT: - return BUFFER_FRONT_LEFT; - case GL_AUX0: - return BUFFER_AUX0; - case GL_AUX1: - case GL_AUX2: - case GL_AUX3: - return BUFFER_COUNT; /* invalid, but not -1 */ - case GL_COLOR_ATTACHMENT0_EXT: - return BUFFER_COLOR0; - case GL_COLOR_ATTACHMENT1_EXT: - return BUFFER_COLOR1; - case GL_COLOR_ATTACHMENT2_EXT: - return BUFFER_COLOR2; - case GL_COLOR_ATTACHMENT3_EXT: - return BUFFER_COLOR3; - case GL_COLOR_ATTACHMENT4_EXT: - return BUFFER_COLOR4; - case GL_COLOR_ATTACHMENT5_EXT: - return BUFFER_COLOR5; - case GL_COLOR_ATTACHMENT6_EXT: - return BUFFER_COLOR6; - case GL_COLOR_ATTACHMENT7_EXT: - return BUFFER_COLOR7; - default: - /* error */ - return -1; - } -} - - -/** - * Called by glDrawBuffer(). - * Specify which renderbuffer(s) to draw into for the first color output. - * can name zero, one, two or four renderbuffers! - * \sa _mesa_DrawBuffersARB - * - * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc. - * - * Note that the behaviour of this function depends on whether the - * current ctx->DrawBuffer is a window-system framebuffer (Name=0) or - * a user-created framebuffer object (Name!=0). - * In the former case, we update the per-context ctx->Color.DrawBuffer - * state var _and_ the FB's ColorDrawBuffer state. - * In the later case, we update the FB's ColorDrawBuffer state only. - * - * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the - * new FB is a window system FB, we need to re-update the FB's - * ColorDrawBuffer state to match the context. This is handled in - * _mesa_update_framebuffer(). - * - * See the GL_EXT_framebuffer_object spec for more info. - */ -void GLAPIENTRY -_mesa_DrawBuffer(GLenum buffer) -{ - GLbitfield destMask; - 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(buffer)); - } - - if (buffer == GL_NONE) { - destMask = 0x0; - } - else { - const GLbitfield supportedMask - = supported_buffer_bitmask(ctx, ctx->DrawBuffer); - destMask = draw_buffer_enum_to_bitmask(buffer); - if (destMask == BAD_MASK) { - /* totally bogus buffer */ - _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer=0x%x)", buffer); - return; - } - destMask &= supportedMask; - if (destMask == 0x0) { - /* none of the named color buffers exist! */ - _mesa_error(ctx, GL_INVALID_OPERATION, - "glDrawBuffer(buffer=0x%x)", buffer); - return; - } - } - - /* if we get here, there's no error so set new state */ - _mesa_drawbuffers(ctx, 1, &buffer, &destMask); - - /* - * Call device driver function. - */ - if (ctx->Driver.DrawBuffers) - ctx->Driver.DrawBuffers(ctx, 1, &buffer); - else if (ctx->Driver.DrawBuffer) - ctx->Driver.DrawBuffer(ctx, buffer); -} - - -/** - * Called by glDrawBuffersARB; specifies the destination color renderbuffers - * for N fragment program color outputs. - * \sa _mesa_DrawBuffer - * \param n number of outputs - * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the - * names cannot specify more than one buffer. For example, - * GL_FRONT_AND_BACK is illegal. - */ -void GLAPIENTRY -_mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers) -{ - GLint output; - GLbitfield usedBufferMask, supportedMask; - GLbitfield destMask[MAX_DRAW_BUFFERS]; - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - - /* Turns out n==0 is a valid input that should not produce an error. - * The remaining code below correctly handles the n==0 case. - */ - if (n < 0 || n > (GLsizei) ctx->Const.MaxDrawBuffers) { - _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)"); - return; - } - - supportedMask = supported_buffer_bitmask(ctx, ctx->DrawBuffer); - usedBufferMask = 0x0; - - /* complicated error checking... */ - for (output = 0; output < n; output++) { - if (buffers[output] == GL_NONE) { - destMask[output] = 0x0; - } - else { - destMask[output] = draw_buffer_enum_to_bitmask(buffers[output]); - if (destMask[output] == BAD_MASK - || _mesa_bitcount(destMask[output]) > 1) { - _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffersARB(buffer)"); - return; - } - destMask[output] &= supportedMask; - if (destMask[output] == 0) { - _mesa_error(ctx, GL_INVALID_OPERATION, - "glDrawBuffersARB(unsupported buffer)"); - return; - } - if (destMask[output] & usedBufferMask) { - /* can't specify a dest buffer more than once! */ - _mesa_error(ctx, GL_INVALID_OPERATION, - "glDrawBuffersARB(duplicated buffer)"); - return; - } - - /* update bitmask */ - usedBufferMask |= destMask[output]; - } - } - - /* OK, if we get here, there were no errors so set the new state */ - _mesa_drawbuffers(ctx, n, buffers, destMask); - - /* - * Call device driver function. Note that n can be equal to 0, - * in which case we don't want to reference buffers[0], which - * may not be valid. - */ - if (ctx->Driver.DrawBuffers) - ctx->Driver.DrawBuffers(ctx, n, buffers); - else if (ctx->Driver.DrawBuffer) - ctx->Driver.DrawBuffer(ctx, n > 0 ? buffers[0] : GL_NONE); -} - - -/** - * Helper function to set the GL_DRAW_BUFFER state in the context and - * current FBO. Called via glDrawBuffer(), glDrawBuffersARB() - * - * All error checking will have been done prior to calling this function - * so nothing should go wrong at this point. - * - * \param ctx current context - * \param n number of color outputs to set - * \param buffers array[n] of colorbuffer names, like GL_LEFT. - * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the - * colorbuffer names. (i.e. GL_FRONT_AND_BACK => - * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT). - */ -void -_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers, - const GLbitfield *destMask) -{ - struct gl_framebuffer *fb = ctx->DrawBuffer; - GLbitfield mask[MAX_DRAW_BUFFERS]; - GLboolean newState = GL_FALSE; - - if (!destMask) { - /* compute destMask values now */ - const GLbitfield supportedMask = supported_buffer_bitmask(ctx, fb); - GLuint output; - for (output = 0; output < n; output++) { - mask[output] = draw_buffer_enum_to_bitmask(buffers[output]); - ASSERT(mask[output] != BAD_MASK); - mask[output] &= supportedMask; - } - destMask = mask; - } - - /* - * If n==1, destMask[0] may have up to four bits set. - * Otherwise, destMask[x] can only have one bit set. - */ - if (n == 1) { - GLuint count = 0, destMask0 = destMask[0]; - while (destMask0) { - GLint bufIndex = _mesa_ffs(destMask0) - 1; - if (fb->_ColorDrawBufferIndexes[count] != bufIndex) { - fb->_ColorDrawBufferIndexes[count] = bufIndex; - newState = GL_TRUE; - } - count++; - destMask0 &= ~(1 << bufIndex); - } - fb->ColorDrawBuffer[0] = buffers[0]; - if (fb->_NumColorDrawBuffers != count) { - fb->_NumColorDrawBuffers = count; - newState = GL_TRUE; - } - } - else { - GLuint buf, count = 0; - for (buf = 0; buf < n; buf++ ) { - if (destMask[buf]) { - GLint bufIndex = _mesa_ffs(destMask[buf]) - 1; - /* only one bit should be set in the destMask[buf] field */ - ASSERT(_mesa_bitcount(destMask[buf]) == 1); - if (fb->_ColorDrawBufferIndexes[buf] != bufIndex) { - fb->_ColorDrawBufferIndexes[buf] = bufIndex; - newState = GL_TRUE; - } - fb->ColorDrawBuffer[buf] = buffers[buf]; - count = buf + 1; - } - else { - if (fb->_ColorDrawBufferIndexes[buf] != -1) { - fb->_ColorDrawBufferIndexes[buf] = -1; - newState = GL_TRUE; - } - } - } - /* set remaining outputs to -1 (GL_NONE) */ - while (buf < ctx->Const.MaxDrawBuffers) { - if (fb->_ColorDrawBufferIndexes[buf] != -1) { - fb->_ColorDrawBufferIndexes[buf] = -1; - newState = GL_TRUE; - } - fb->ColorDrawBuffer[buf] = GL_NONE; - buf++; - } - fb->_NumColorDrawBuffers = count; - } - - if (fb->Name == 0) { - /* also set context drawbuffer state */ - GLuint buf; - for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) { - if (ctx->Color.DrawBuffer[buf] != fb->ColorDrawBuffer[buf]) { - ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf]; - newState = GL_TRUE; - } - } - } - - if (newState) - FLUSH_VERTICES(ctx, _NEW_BUFFERS); -} - - -/** - * Like \sa _mesa_drawbuffers(), this is a helper function for setting - * GL_READ_BUFFER state in the context and current FBO. - * \param ctx the rendering context - * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc. - * \param bufferIndex the numerical index corresponding to 'buffer' - */ -void -_mesa_readbuffer(GLcontext *ctx, GLenum buffer, GLint bufferIndex) -{ - struct gl_framebuffer *fb = ctx->ReadBuffer; - - if (fb->Name == 0) { - /* Only update the per-context READ_BUFFER state if we're bound to - * a window-system framebuffer. - */ - ctx->Pixel.ReadBuffer = buffer; - } - - fb->ColorReadBuffer = buffer; - fb->_ColorReadBufferIndex = bufferIndex; - - ctx->NewState |= _NEW_BUFFERS; -} - - - -/** - * Called by glReadBuffer to set the source renderbuffer for reading pixels. - * \param mode color buffer such as GL_FRONT, GL_BACK, etc. - */ -void GLAPIENTRY -_mesa_ReadBuffer(GLenum buffer) -{ - struct gl_framebuffer *fb; - GLbitfield supportedMask; - GLint srcBuffer; - 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(buffer)); - - fb = ctx->ReadBuffer; - - if (MESA_VERBOSE & VERBOSE_API) - _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer)); - - if (fb->Name > 0 && buffer == GL_NONE) { - /* This is legal for user-created framebuffer objects */ - srcBuffer = -1; - } - else { - /* general case / window-system framebuffer */ - srcBuffer = read_buffer_enum_to_index(buffer); - if (srcBuffer == -1) { - _mesa_error(ctx, GL_INVALID_ENUM, - "glReadBuffer(buffer=0x%x)", buffer); - return; - } - supportedMask = supported_buffer_bitmask(ctx, fb); - if (((1 << srcBuffer) & supportedMask) == 0) { - _mesa_error(ctx, GL_INVALID_OPERATION, - "glReadBuffer(buffer=0x%x)", buffer); - return; - } - } - - /* OK, all error checking has been completed now */ - - _mesa_readbuffer(ctx, buffer, srcBuffer); - ctx->NewState |= _NEW_BUFFERS; - - /* - * Call device driver function. - */ - if (ctx->Driver.ReadBuffer) - (*ctx->Driver.ReadBuffer)(ctx, buffer); -} +/* + * 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 buffers.c + * glReadBuffer, DrawBuffer functions. + */ + + + +#include "glheader.h" +#include "buffers.h" +#include "colormac.h" +#include "context.h" +#include "enums.h" + + +#define BAD_MASK ~0u + + +/** + * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are + * available to the rendering context (for drawing or reading). + * This depends on the type of framebuffer. For window system framebuffers + * we look at the framebuffer's visual. But for user-create framebuffers we + * look at the number of supported color attachments. + * \param fb the framebuffer to draw to, or read from + * \return bitmask of BUFFER_BIT_* flags + */ +static GLbitfield +supported_buffer_bitmask(const struct gl_context *ctx, const struct gl_framebuffer *fb) +{ + GLbitfield mask = 0x0; + + if (fb->Name > 0) { + /* A user-created renderbuffer */ + GLuint i; + ASSERT(ctx->Extensions.EXT_framebuffer_object); + for (i = 0; i < ctx->Const.MaxColorAttachments; i++) { + mask |= (BUFFER_BIT_COLOR0 << i); + } + } + else { + /* A window system framebuffer */ + GLint i; + mask = BUFFER_BIT_FRONT_LEFT; /* always have this */ + if (fb->Visual.stereoMode) { + mask |= BUFFER_BIT_FRONT_RIGHT; + if (fb->Visual.doubleBufferMode) { + mask |= BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT; + } + } + else if (fb->Visual.doubleBufferMode) { + mask |= BUFFER_BIT_BACK_LEFT; + } + + for (i = 0; i < fb->Visual.numAuxBuffers; i++) { + mask |= (BUFFER_BIT_AUX0 << i); + } + } + + return mask; +} + + +/** + * Helper routine used by glDrawBuffer and glDrawBuffersARB. + * Given a GLenum naming one or more color buffers (such as + * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags. + */ +static GLbitfield +draw_buffer_enum_to_bitmask(GLenum buffer) +{ + switch (buffer) { + case GL_NONE: + return 0; + case GL_FRONT: + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT; + case GL_BACK: + return BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT; + case GL_RIGHT: + return BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; + case GL_FRONT_RIGHT: + return BUFFER_BIT_FRONT_RIGHT; + case GL_BACK_RIGHT: + return BUFFER_BIT_BACK_RIGHT; + case GL_BACK_LEFT: + return BUFFER_BIT_BACK_LEFT; + case GL_FRONT_AND_BACK: + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT + | BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; + case GL_LEFT: + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT; + case GL_FRONT_LEFT: + return BUFFER_BIT_FRONT_LEFT; + case GL_AUX0: + return BUFFER_BIT_AUX0; + case GL_AUX1: + case GL_AUX2: + case GL_AUX3: + return 1 << BUFFER_COUNT; /* invalid, but not BAD_MASK */ + case GL_COLOR_ATTACHMENT0_EXT: + return BUFFER_BIT_COLOR0; + case GL_COLOR_ATTACHMENT1_EXT: + return BUFFER_BIT_COLOR1; + case GL_COLOR_ATTACHMENT2_EXT: + return BUFFER_BIT_COLOR2; + case GL_COLOR_ATTACHMENT3_EXT: + return BUFFER_BIT_COLOR3; + case GL_COLOR_ATTACHMENT4_EXT: + return BUFFER_BIT_COLOR4; + case GL_COLOR_ATTACHMENT5_EXT: + return BUFFER_BIT_COLOR5; + case GL_COLOR_ATTACHMENT6_EXT: + return BUFFER_BIT_COLOR6; + case GL_COLOR_ATTACHMENT7_EXT: + return BUFFER_BIT_COLOR7; + default: + /* error */ + return BAD_MASK; + } +} + + +/** + * Helper routine used by glReadBuffer. + * Given a GLenum naming a color buffer, return the index of the corresponding + * renderbuffer (a BUFFER_* value). + * return -1 for an invalid buffer. + */ +static GLint +read_buffer_enum_to_index(GLenum buffer) +{ + switch (buffer) { + case GL_FRONT: + return BUFFER_FRONT_LEFT; + case GL_BACK: + return BUFFER_BACK_LEFT; + case GL_RIGHT: + return BUFFER_FRONT_RIGHT; + case GL_FRONT_RIGHT: + return BUFFER_FRONT_RIGHT; + case GL_BACK_RIGHT: + return BUFFER_BACK_RIGHT; + case GL_BACK_LEFT: + return BUFFER_BACK_LEFT; + case GL_LEFT: + return BUFFER_FRONT_LEFT; + case GL_FRONT_LEFT: + return BUFFER_FRONT_LEFT; + case GL_AUX0: + return BUFFER_AUX0; + case GL_AUX1: + case GL_AUX2: + case GL_AUX3: + return BUFFER_COUNT; /* invalid, but not -1 */ + case GL_COLOR_ATTACHMENT0_EXT: + return BUFFER_COLOR0; + case GL_COLOR_ATTACHMENT1_EXT: + return BUFFER_COLOR1; + case GL_COLOR_ATTACHMENT2_EXT: + return BUFFER_COLOR2; + case GL_COLOR_ATTACHMENT3_EXT: + return BUFFER_COLOR3; + case GL_COLOR_ATTACHMENT4_EXT: + return BUFFER_COLOR4; + case GL_COLOR_ATTACHMENT5_EXT: + return BUFFER_COLOR5; + case GL_COLOR_ATTACHMENT6_EXT: + return BUFFER_COLOR6; + case GL_COLOR_ATTACHMENT7_EXT: + return BUFFER_COLOR7; + default: + /* error */ + return -1; + } +} + + +/** + * Called by glDrawBuffer(). + * Specify which renderbuffer(s) to draw into for the first color output. + * can name zero, one, two or four renderbuffers! + * \sa _mesa_DrawBuffersARB + * + * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc. + * + * Note that the behaviour of this function depends on whether the + * current ctx->DrawBuffer is a window-system framebuffer (Name=0) or + * a user-created framebuffer object (Name!=0). + * In the former case, we update the per-context ctx->Color.DrawBuffer + * state var _and_ the FB's ColorDrawBuffer state. + * In the later case, we update the FB's ColorDrawBuffer state only. + * + * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the + * new FB is a window system FB, we need to re-update the FB's + * ColorDrawBuffer state to match the context. This is handled in + * _mesa_update_framebuffer(). + * + * See the GL_EXT_framebuffer_object spec for more info. + */ +void GLAPIENTRY +_mesa_DrawBuffer(GLenum buffer) +{ + GLbitfield destMask; + 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(buffer)); + } + + if (buffer == GL_NONE) { + destMask = 0x0; + } + else { + const GLbitfield supportedMask + = supported_buffer_bitmask(ctx, ctx->DrawBuffer); + destMask = draw_buffer_enum_to_bitmask(buffer); + if (destMask == BAD_MASK) { + /* totally bogus buffer */ + _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer=0x%x)", buffer); + return; + } + destMask &= supportedMask; + if (destMask == 0x0) { + /* none of the named color buffers exist! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffer(buffer=0x%x)", buffer); + return; + } + } + + /* if we get here, there's no error so set new state */ + _mesa_drawbuffers(ctx, 1, &buffer, &destMask); + + /* + * Call device driver function. + */ + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, 1, &buffer); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffer); +} + + +/** + * Called by glDrawBuffersARB; specifies the destination color renderbuffers + * for N fragment program color outputs. + * \sa _mesa_DrawBuffer + * \param n number of outputs + * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the + * names cannot specify more than one buffer. For example, + * GL_FRONT_AND_BACK is illegal. + */ +void GLAPIENTRY +_mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers) +{ + GLint output; + GLbitfield usedBufferMask, supportedMask; + GLbitfield destMask[MAX_DRAW_BUFFERS]; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + + /* Turns out n==0 is a valid input that should not produce an error. + * The remaining code below correctly handles the n==0 case. + */ + if (n < 0 || n > (GLsizei) ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)"); + return; + } + + supportedMask = supported_buffer_bitmask(ctx, ctx->DrawBuffer); + usedBufferMask = 0x0; + + /* complicated error checking... */ + for (output = 0; output < n; output++) { + if (buffers[output] == GL_NONE) { + destMask[output] = 0x0; + } + else { + destMask[output] = draw_buffer_enum_to_bitmask(buffers[output]); + if (destMask[output] == BAD_MASK + || _mesa_bitcount(destMask[output]) > 1) { + _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffersARB(buffer)"); + return; + } + destMask[output] &= supportedMask; + if (destMask[output] == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(unsupported buffer)"); + return; + } + if (destMask[output] & usedBufferMask) { + /* can't specify a dest buffer more than once! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(duplicated buffer)"); + return; + } + + /* update bitmask */ + usedBufferMask |= destMask[output]; + } + } + + /* OK, if we get here, there were no errors so set the new state */ + _mesa_drawbuffers(ctx, n, buffers, destMask); + + /* + * Call device driver function. Note that n can be equal to 0, + * in which case we don't want to reference buffers[0], which + * may not be valid. + */ + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, n, buffers); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, n > 0 ? buffers[0] : GL_NONE); +} + + +/** + * Helper function to set the GL_DRAW_BUFFER state in the context and + * current FBO. Called via glDrawBuffer(), glDrawBuffersARB() + * + * All error checking will have been done prior to calling this function + * so nothing should go wrong at this point. + * + * \param ctx current context + * \param n number of color outputs to set + * \param buffers array[n] of colorbuffer names, like GL_LEFT. + * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the + * colorbuffer names. (i.e. GL_FRONT_AND_BACK => + * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT). + */ +void +_mesa_drawbuffers(struct gl_context *ctx, GLuint n, const GLenum *buffers, + const GLbitfield *destMask) +{ + struct gl_framebuffer *fb = ctx->DrawBuffer; + GLbitfield mask[MAX_DRAW_BUFFERS]; + GLboolean newState = GL_FALSE; + + if (!destMask) { + /* compute destMask values now */ + const GLbitfield supportedMask = supported_buffer_bitmask(ctx, fb); + GLuint output; + for (output = 0; output < n; output++) { + mask[output] = draw_buffer_enum_to_bitmask(buffers[output]); + ASSERT(mask[output] != BAD_MASK); + mask[output] &= supportedMask; + } + destMask = mask; + } + + /* + * If n==1, destMask[0] may have up to four bits set. + * Otherwise, destMask[x] can only have one bit set. + */ + if (n == 1) { + GLuint count = 0, destMask0 = destMask[0]; + while (destMask0) { + GLint bufIndex = _mesa_ffs(destMask0) - 1; + if (fb->_ColorDrawBufferIndexes[count] != bufIndex) { + fb->_ColorDrawBufferIndexes[count] = bufIndex; + newState = GL_TRUE; + } + count++; + destMask0 &= ~(1 << bufIndex); + } + fb->ColorDrawBuffer[0] = buffers[0]; + if (fb->_NumColorDrawBuffers != count) { + fb->_NumColorDrawBuffers = count; + newState = GL_TRUE; + } + } + else { + GLuint buf, count = 0; + for (buf = 0; buf < n; buf++ ) { + if (destMask[buf]) { + GLint bufIndex = _mesa_ffs(destMask[buf]) - 1; + /* only one bit should be set in the destMask[buf] field */ + ASSERT(_mesa_bitcount(destMask[buf]) == 1); + if (fb->_ColorDrawBufferIndexes[buf] != bufIndex) { + fb->_ColorDrawBufferIndexes[buf] = bufIndex; + newState = GL_TRUE; + } + fb->ColorDrawBuffer[buf] = buffers[buf]; + count = buf + 1; + } + else { + if (fb->_ColorDrawBufferIndexes[buf] != -1) { + fb->_ColorDrawBufferIndexes[buf] = -1; + newState = GL_TRUE; + } + } + } + /* set remaining outputs to -1 (GL_NONE) */ + while (buf < ctx->Const.MaxDrawBuffers) { + if (fb->_ColorDrawBufferIndexes[buf] != -1) { + fb->_ColorDrawBufferIndexes[buf] = -1; + newState = GL_TRUE; + } + fb->ColorDrawBuffer[buf] = GL_NONE; + buf++; + } + fb->_NumColorDrawBuffers = count; + } + + if (fb->Name == 0) { + /* also set context drawbuffer state */ + GLuint buf; + for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) { + if (ctx->Color.DrawBuffer[buf] != fb->ColorDrawBuffer[buf]) { + ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf]; + newState = GL_TRUE; + } + } + } + + if (newState) + FLUSH_VERTICES(ctx, _NEW_BUFFERS); +} + + +/** + * Like \sa _mesa_drawbuffers(), this is a helper function for setting + * GL_READ_BUFFER state in the context and current FBO. + * \param ctx the rendering context + * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc. + * \param bufferIndex the numerical index corresponding to 'buffer' + */ +void +_mesa_readbuffer(struct gl_context *ctx, GLenum buffer, GLint bufferIndex) +{ + struct gl_framebuffer *fb = ctx->ReadBuffer; + + if (fb->Name == 0) { + /* Only update the per-context READ_BUFFER state if we're bound to + * a window-system framebuffer. + */ + ctx->Pixel.ReadBuffer = buffer; + } + + fb->ColorReadBuffer = buffer; + fb->_ColorReadBufferIndex = bufferIndex; + + ctx->NewState |= _NEW_BUFFERS; +} + + + +/** + * Called by glReadBuffer to set the source renderbuffer for reading pixels. + * \param mode color buffer such as GL_FRONT, GL_BACK, etc. + */ +void GLAPIENTRY +_mesa_ReadBuffer(GLenum buffer) +{ + struct gl_framebuffer *fb; + GLbitfield supportedMask; + GLint srcBuffer; + 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(buffer)); + + fb = ctx->ReadBuffer; + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer)); + + if (fb->Name > 0 && buffer == GL_NONE) { + /* This is legal for user-created framebuffer objects */ + srcBuffer = -1; + } + else { + /* general case / window-system framebuffer */ + srcBuffer = read_buffer_enum_to_index(buffer); + if (srcBuffer == -1) { + _mesa_error(ctx, GL_INVALID_ENUM, + "glReadBuffer(buffer=0x%x)", buffer); + return; + } + supportedMask = supported_buffer_bitmask(ctx, fb); + if (((1 << srcBuffer) & supportedMask) == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glReadBuffer(buffer=0x%x)", buffer); + return; + } + } + + /* OK, all error checking has been completed now */ + + _mesa_readbuffer(ctx, buffer, srcBuffer); + ctx->NewState |= _NEW_BUFFERS; + + /* + * Call device driver function. + */ + if (ctx->Driver.ReadBuffer) + (*ctx->Driver.ReadBuffer)(ctx, buffer); +} -- cgit v1.2.3