X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Fbuffers.c;h=b23d2f612bfdef278fcfb6818fcffb34ef160e01;hb=08d90fe8a5e12d92994c05b2ec9f68ab7232275c;hp=7d6528291b58c3b66ebd25e389e24fceafe22631;hpb=ba643a2094a1e844b6ce60f468057057557859ce;p=mesa.git diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c index 7d6528291b5..b23d2f612bf 100644 --- a/src/mesa/main/buffers.c +++ b/src/mesa/main/buffers.c @@ -1,21 +1,19 @@ -/* $Id: buffers.c,v 1.15 2000/10/28 18:34:48 brianp Exp $ */ - /* * Mesa 3-D graphics library - * Version: 3.5 - * - * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. - * + * 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 @@ -25,550 +23,481 @@ */ -#ifdef PC_HEADER -#include "all.h" -#else +/** + * \file buffers.c + * glReadBuffer, DrawBuffer functions. + */ + + + #include "glheader.h" -#include "accum.h" -#include "alphabuf.h" #include "buffers.h" +#include "colormac.h" #include "context.h" -#include "depth.h" #include "enums.h" -#include "macros.h" -#include "masking.h" -#include "mem.h" -#include "stencil.h" +#include "fbobject.h" #include "state.h" -#include "types.h" -#endif - - - -void -_mesa_ClearIndex( GLfloat c ) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glClearIndex"); - ctx->Color.ClearIndex = (GLuint) c; - if (!ctx->Visual.RGBAflag) { - /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */ - (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex ); - } -} - -void -_mesa_ClearColor( GLclampf red, GLclampf green, - GLclampf blue, GLclampf alpha ) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glClearColor"); - - ctx->Color.ClearColor[0] = CLAMP( red, 0.0F, 1.0F ); - ctx->Color.ClearColor[1] = CLAMP( green, 0.0F, 1.0F ); - ctx->Color.ClearColor[2] = CLAMP( blue, 0.0F, 1.0F ); - ctx->Color.ClearColor[3] = CLAMP( alpha, 0.0F, 1.0F ); - - if (ctx->Visual.RGBAflag) { - GLchan r = (GLint) (ctx->Color.ClearColor[0] * CHAN_MAXF); - GLchan g = (GLint) (ctx->Color.ClearColor[1] * CHAN_MAXF); - GLchan b = (GLint) (ctx->Color.ClearColor[2] * CHAN_MAXF); - GLchan a = (GLint) (ctx->Color.ClearColor[3] * CHAN_MAXF); - (*ctx->Driver.ClearColor)( ctx, r, g, b, a ); - } -} - +#define BAD_MASK ~0u - -/* - * Clear the color buffer when glColorMask or glIndexMask is in effect. +/** + * 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 void -clear_color_buffer_with_masking( GLcontext *ctx ) +static GLbitfield +supported_buffer_bitmask(const GLcontext *ctx, const struct gl_framebuffer *fb) { - 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; - - if (ctx->Visual.RGBAflag) { - /* RGBA mode */ - const GLchan r = (GLint) (ctx->Color.ClearColor[0] * CHAN_MAXF); - const GLchan g = (GLint) (ctx->Color.ClearColor[1] * CHAN_MAXF); - const GLchan b = (GLint) (ctx->Color.ClearColor[2] * CHAN_MAXF); - const GLchan a = (GLint) (ctx->Color.ClearColor[3] * CHAN_MAXF); - GLint i; - for (i = 0; i < height; i++) { - GLchan rgba[MAX_WIDTH][4]; - GLint j; - for (j=0; jDriver.WriteRGBASpan)( ctx, width, x, y + i, - (CONST GLchan (*)[4]) rgba, NULL ); + 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 { - /* Color index mode */ - GLuint span[MAX_WIDTH]; - GLubyte mask[MAX_WIDTH]; - GLint i, j; - MEMSET( mask, 1, width ); - for (i=0;iColor.ClearIndex; + /* 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; } - _mesa_mask_index_span( ctx, width, x, y + i, span ); - (*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, mask ); + } + 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; +} -/* - * Clear a color buffer without index/channel masking. +/** + * 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 void -clear_color_buffer(GLcontext *ctx) +static GLbitfield +draw_buffer_enum_to_bitmask(GLenum buffer) { - 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; - const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask); - - if (ctx->Visual.RGBAflag) { - /* RGBA mode */ - const GLchan r = (GLint) (ctx->Color.ClearColor[0] * CHAN_MAXF); - const GLchan g = (GLint) (ctx->Color.ClearColor[1] * CHAN_MAXF); - const GLchan b = (GLint) (ctx->Color.ClearColor[2] * CHAN_MAXF); - const GLchan a = (GLint) (ctx->Color.ClearColor[3] * CHAN_MAXF); - GLchan span[MAX_WIDTH][4]; - GLint i; - - ASSERT(colorMask == 0xffffffff); - - for (i = 0; i < width; i++) { - span[i][RCOMP] = r; - span[i][GCOMP] = g; - span[i][BCOMP] = b; - span[i][ACOMP] = a; - } - for (i = 0; i < height; i++) { - (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y + i, - (CONST GLchan (*)[4]) span, NULL ); - } - } - else { - /* Color index mode */ - ASSERT(ctx->Color.IndexMask == ~0); - if (ctx->Visual.IndexBits == 8) { - /* 8-bit clear */ - GLchan span[MAX_WIDTH]; - GLint i; - MEMSET(span, ctx->Color.ClearIndex, width); - for (i = 0; i < height; i++) { - (*ctx->Driver.WriteCI8Span)( ctx, width, x, y + i, span, NULL ); - } - } - else { - /* non 8-bit clear */ - GLuint span[MAX_WIDTH]; - GLint i; - for (i = 0; i < width; i++) { - span[i] = ctx->Color.ClearIndex; - } - for (i = 0; i < height; i++) { - (*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, NULL ); - } - } + 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: + return BUFFER_BIT_AUX1; + case GL_AUX2: + return BUFFER_BIT_AUX2; + case GL_AUX3: + return BUFFER_BIT_AUX3; + 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; } } - -/* - * Clear the front/back/left/right color buffers. - * This function is usually only called if we need to clear the - * buffers with masking. +/** + * 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 void -clear_color_buffers(GLcontext *ctx) +static GLint +read_buffer_enum_to_index(GLenum buffer) { - const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask); - GLuint bufferBit; - - /* loop over four possible dest color buffers */ - for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) { - if (bufferBit & ctx->Color.DrawDestMask) { - if (bufferBit == FRONT_LEFT_BIT) { - (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_LEFT); - (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_LEFT); - } - else if (bufferBit == FRONT_RIGHT_BIT) { - (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_RIGHT); - (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_RIGHT); - } - else if (bufferBit == BACK_LEFT_BIT) { - (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_LEFT); - (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_LEFT); - } - else { - (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_RIGHT); - (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_RIGHT); - } - - if (colorMask != 0xffffffff) { - clear_color_buffer_with_masking(ctx); - } - else { - clear_color_buffer(ctx); - } - } + 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: + return BUFFER_AUX1; + case GL_AUX2: + return BUFFER_AUX2; + case GL_AUX3: + return BUFFER_AUX3; + 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; } - - /* restore default read/draw buffers */ - (void) (*ctx->Driver.SetDrawBuffer)( ctx, ctx->Color.DriverDrawBuffer ); - (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer, ctx->Pixel.DriverReadBuffer ); } - -void -_mesa_Clear( GLbitfield mask ) +/** + * 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); -#ifdef PROFILE - GLdouble t0 = gl_time(); -#endif - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glClear"); - - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glClear 0x%x\n", mask); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */ - if (ctx->NewState) { - gl_update_state( ctx ); + if (MESA_VERBOSE & VERBOSE_API) { + _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer)); } - 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; - GLbitfield newMask; - - /* don't clear depth buffer if depth writing disabled */ - if (!ctx->Depth.Mask) - CLEAR_BITS(mask, GL_DEPTH_BUFFER_BIT); - - /* Build bitmask to send to driver Clear function */ - ddMask = mask & (GL_DEPTH_BUFFER_BIT | - GL_STENCIL_BUFFER_BIT | - GL_ACCUM_BUFFER_BIT); - if (mask & GL_COLOR_BUFFER_BIT) { - ddMask |= ctx->Color.DrawDestMask; - } - - ASSERT(ctx->Driver.Clear); - newMask = (*ctx->Driver.Clear)( ctx, ddMask, !ctx->Scissor.Enabled, - x, y, width, height ); - -#ifdef DEBUG - { - GLbitfield legalBits = DD_FRONT_LEFT_BIT | - DD_FRONT_RIGHT_BIT | - DD_BACK_LEFT_BIT | - DD_BACK_RIGHT_BIT | - DD_DEPTH_BIT | - DD_STENCIL_BIT | - DD_ACCUM_BIT; - assert((newMask & (~legalBits)) == 0); - } -#endif - - RENDER_START(ctx); - - /* do software clearing here */ - if (newMask) { - if (newMask & ctx->Color.DrawDestMask) clear_color_buffers(ctx); - if (newMask & GL_DEPTH_BUFFER_BIT) _mesa_clear_depth_buffer(ctx); - if (newMask & GL_ACCUM_BUFFER_BIT) _mesa_clear_accum_buffer(ctx); - if (newMask & GL_STENCIL_BUFFER_BIT) _mesa_clear_stencil_buffer(ctx); + 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)"); + return; } - - /* clear software-based alpha buffer(s) */ - if ( (mask & GL_COLOR_BUFFER_BIT) - && ctx->DrawBuffer->UseSoftwareAlphaBuffers - && ctx->Color.ColorMask[ACOMP]) { - _mesa_clear_alpha_buffers( ctx ); + destMask &= supportedMask; + if (destMask == 0x0) { + /* none of the named color buffers exist! */ + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(buffer)"); + return; } + } - RENDER_FINISH(ctx); + /* if we get here, there's no error so set new state */ + _mesa_drawbuffers(ctx, 1, &buffer, &destMask); -#ifdef PROFILE - ctx->ClearTime += gl_time() - t0; - ctx->ClearCount++; -#endif - } + /* + * Call device driver function. + */ + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, 1, &buffer); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffer); } -void -_mesa_DrawBuffer( GLenum mode ) +/** + * 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, "glDrawBuffer"); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glDrawBuffer %s\n", gl_lookup_enum_by_nr(mode)); + if (!ctx->Extensions.ARB_draw_buffers) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffersARB"); + return; + } + if (n < 1 || n > (GLsizei) ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)"); + return; + } - switch (mode) { - case GL_AUX0: - case GL_AUX1: - case GL_AUX2: - case GL_AUX3: - /* AUX buffers not implemented in Mesa at this time */ - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - case GL_RIGHT: - if (!ctx->Visual.StereoFlag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return;} - if (ctx->Visual.DBflag) - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT; - else - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT; - break; - case GL_FRONT_RIGHT: - if (!ctx->Visual.StereoFlag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT; - break; - case GL_BACK_RIGHT: - if (!ctx->Visual.StereoFlag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - if (!ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - ctx->Color.DrawDestMask = BACK_RIGHT_BIT; - break; - case GL_BACK_LEFT: - if (!ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); + 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; - } - ctx->Color.DrawDestMask = BACK_LEFT_BIT; - break; - case GL_FRONT_AND_BACK: - if (!ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); + } + destMask[output] &= supportedMask; + if (destMask[output] == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(unsupported buffer)"); return; } - if (ctx->Visual.StereoFlag) - ctx->Color.DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT - | FRONT_RIGHT_BIT | BACK_RIGHT_BIT; - else - ctx->Color.DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; - break; - case GL_BACK: - if (!ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); + if (destMask[output] & usedBufferMask) { + /* can't specify a dest buffer more than once! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(duplicated buffer)"); return; } - if (ctx->Visual.StereoFlag) - ctx->Color.DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT; - else - ctx->Color.DrawDestMask = BACK_LEFT_BIT; - break; - case GL_LEFT: - /* never an error */ - if (ctx->Visual.DBflag) - ctx->Color.DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; - else - ctx->Color.DrawDestMask = FRONT_LEFT_BIT; - break; - case GL_FRONT_LEFT: - /* never an error */ - ctx->Color.DrawDestMask = FRONT_LEFT_BIT; - break; - case GL_FRONT: - /* never an error */ - if (ctx->Visual.StereoFlag) - ctx->Color.DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT; - else - ctx->Color.DrawDestMask = FRONT_LEFT_BIT; - break; - case GL_NONE: - /* never an error */ - ctx->Color.DrawDestMask = 0; - break; - default: - gl_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" ); - return; - } - /* - * Make the dest buffer mode more precise if possible - */ - if (mode == GL_LEFT && !ctx->Visual.DBflag) - ctx->Color.DriverDrawBuffer = GL_FRONT_LEFT; - else if (mode == GL_RIGHT && !ctx->Visual.DBflag) - ctx->Color.DriverDrawBuffer = GL_FRONT_RIGHT; - else if (mode == GL_FRONT && !ctx->Visual.StereoFlag) - ctx->Color.DriverDrawBuffer = GL_FRONT_LEFT; - else if (mode == GL_BACK && !ctx->Visual.StereoFlag) - ctx->Color.DriverDrawBuffer = GL_BACK_LEFT; - else - ctx->Color.DriverDrawBuffer = mode; - - /* - * Set current alpha buffer pointer - */ - if (ctx->DrawBuffer->UseSoftwareAlphaBuffers) { - if (ctx->Color.DriverDrawBuffer == GL_FRONT_LEFT) - ctx->DrawBuffer->Alpha = ctx->DrawBuffer->FrontLeftAlpha; - else if (ctx->Color.DriverDrawBuffer == GL_BACK_LEFT) - ctx->DrawBuffer->Alpha = ctx->DrawBuffer->BackLeftAlpha; - else if (ctx->Color.DriverDrawBuffer == GL_FRONT_RIGHT) - ctx->DrawBuffer->Alpha = ctx->DrawBuffer->FrontRightAlpha; - else if (ctx->Color.DriverDrawBuffer == GL_BACK_RIGHT) - ctx->DrawBuffer->Alpha = ctx->DrawBuffer->BackRightAlpha; + /* 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); + /* - * If we get here there can't have been an error. - * Now see if device driver can implement the drawing to the target - * buffer(s). The driver may not be able to do GL_FRONT_AND_BACK mode - * for example. We'll take care of that in the core code by looping - * over the individual buffers. + * Call device driver function. */ - ASSERT(ctx->Driver.SetDrawBuffer); - if ( (*ctx->Driver.SetDrawBuffer)(ctx, ctx->Color.DriverDrawBuffer) ) { - /* All OK, the driver will do all buffer writes */ - ctx->Color.MultiDrawBuffer = GL_FALSE; - } - else { - /* We'll have to loop over the multiple draw buffer targets */ - ctx->Color.MultiDrawBuffer = GL_TRUE; - /* Set drawing buffer to front for now */ - (void) (*ctx->Driver.SetDrawBuffer)(ctx, GL_FRONT_LEFT); - } - - ctx->Color.DrawBuffer = mode; - ctx->NewState |= NEW_RASTER_OPS; + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, n, buffers); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffers[0]); } - +/** + * Helper function to set the GL_DRAW_BUFFER state in the context and + * current FBO. + * + * 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_ReadBuffer( GLenum mode ) +_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers, + const GLbitfield *destMask) { - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glReadBuffer"); - - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glReadBuffer %s\n", gl_lookup_enum_by_nr(mode)); + struct gl_framebuffer *fb = ctx->DrawBuffer; + GLbitfield mask[MAX_DRAW_BUFFERS]; + + 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; + } - switch (mode) { - case GL_AUX0: - case GL_AUX1: - case GL_AUX2: - case GL_AUX3: - /* AUX buffers not implemented in Mesa at this time */ - gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; - case GL_LEFT: - case GL_FRONT: - case GL_FRONT_LEFT: - /* Front-Left buffer, always exists */ - ctx->Pixel.DriverReadBuffer = GL_FRONT_LEFT; - break; - case GL_BACK: - case GL_BACK_LEFT: - /* Back-Left buffer, requires double buffering */ - if (!ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; + if (n == 1) { + GLuint buf, count = 0; + /* init to -1 to help catch errors */ + fb->_ColorDrawBufferIndexes[0] = -1; + for (buf = 0; buf < BUFFER_COUNT; buf++) { + if (destMask[0] & (1 << buf)) { + fb->_ColorDrawBufferIndexes[count] = buf; + count++; } - ctx->Pixel.DriverReadBuffer = GL_BACK_LEFT; - break; - case GL_FRONT_RIGHT: - case GL_RIGHT: - if (!ctx->Visual.StereoFlag) { - gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; + } + fb->ColorDrawBuffer[0] = buffers[0]; + fb->_NumColorDrawBuffers = count; + } + else { + GLuint buf, count = 0; + for (buf = 0; buf < n; buf++ ) { + if (destMask[buf]) { + fb->_ColorDrawBufferIndexes[buf] = _mesa_ffs(destMask[buf]) - 1; + fb->ColorDrawBuffer[buf] = buffers[buf]; + count = buf + 1; } - ctx->Pixel.DriverReadBuffer = GL_FRONT_RIGHT; - break; - case GL_BACK_RIGHT: - if (!ctx->Visual.StereoFlag || !ctx->Visual.DBflag) { - gl_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); - return; + else { + fb->_ColorDrawBufferIndexes[buf] = -1; } - ctx->Pixel.DriverReadBuffer = GL_BACK_RIGHT; - break; - default: - gl_error( ctx, GL_INVALID_ENUM, "glReadBuffer" ); - return; + } + /* set remaining outputs to -1 (GL_NONE) */ + while (buf < ctx->Const.MaxDrawBuffers) { + fb->_ColorDrawBufferIndexes[buf] = -1; + 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++) { + ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf]; + } } - ctx->Pixel.ReadBuffer = mode; - ctx->NewState |= NEW_RASTER_OPS; + ctx->NewState |= _NEW_COLOR; } -/* - * GL_MESA_resize_buffers extension +/** + * 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_ResizeBuffersMESA( void ) +_mesa_readbuffer(GLcontext *ctx, GLenum buffer, GLint bufferIndex) { - GLcontext *ctx = _mesa_get_current_context(); + struct gl_framebuffer *fb = ctx->ReadBuffer; - GLuint buf_width, buf_height; + 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; + } - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glResizeBuffersMESA\n"); + fb->ColorReadBuffer = buffer; + fb->_ColorReadBufferIndex = bufferIndex; - /* ask device driver for size of output buffer */ - (*ctx->Driver.GetBufferSize)( ctx, &buf_width, &buf_height ); + ctx->NewState |= _NEW_PIXEL; +} - /* see if size of device driver's color buffer (window) has changed */ - if (ctx->DrawBuffer->Width == (GLint) buf_width && - ctx->DrawBuffer->Height == (GLint) buf_height) - return; - ctx->NewState |= NEW_RASTER_OPS; /* to update scissor / window bounds */ - /* save buffer size */ - ctx->DrawBuffer->Width = buf_width; - ctx->DrawBuffer->Height = buf_height; +/** + * 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); - /* Reallocate other buffers if needed. */ - if (ctx->DrawBuffer->UseSoftwareDepthBuffer) { - _mesa_alloc_depth_buffer( ctx ); - } - if (ctx->DrawBuffer->UseSoftwareStencilBuffer) { - _mesa_alloc_stencil_buffer( ctx ); - } - if (ctx->DrawBuffer->UseSoftwareAccumBuffer) { - _mesa_alloc_accum_buffer( 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; } - if (ctx->DrawBuffer->UseSoftwareAlphaBuffers) { - _mesa_alloc_alpha_buffers( ctx ); + 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); + + /* + * Call device driver function. + */ + if (ctx->Driver.ReadBuffer) + (*ctx->Driver.ReadBuffer)(ctx, buffer); }