X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Fbuffers.c;h=3cbd671baba794e9b9fe7c7814a3b82dadcf2edd;hb=ff938bf059a41a9bdf4c2c93cebe4a3b8a89c201;hp=30fa4332804e71f612dc260d1a2adbc796b6f115;hpb=2726d77b2e0610c45019d0070ba21ee8ff47668d;p=mesa.git diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c index 30fa4332804..3cbd671baba 100644 --- a/src/mesa/main/buffers.c +++ b/src/mesa/main/buffers.c @@ -1,13 +1,8 @@ -/** - * \file buffers.c - * Frame buffer management. - */ - /* * Mesa 3-D graphics library - * Version: 6.0.1 + * Version: 7.1 * - * Copyright (C) 1999-2004 Brian Paul All Rights Reserved. + * 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"), @@ -28,16 +23,23 @@ */ +/** + * \file buffers.c + * General framebuffer-related functions, like glClear, glScissor, etc. + */ + + + #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 "fbobject.h" #include "state.h" -#include "mtypes.h" + + +#define BAD_MASK ~0u #if _HAVE_FULL_GL @@ -116,6 +118,8 @@ _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); @@ -132,12 +136,17 @@ _mesa_Clear( GLbitfield mask ) _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; + 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) + return; + + if (ctx->RenderMode == GL_RENDER) { + GLbitfield bufferMask; /* don't clear depth buffer if depth writing disabled */ if (!ctx->Depth.Mask) @@ -145,287 +154,456 @@ _mesa_Clear( GLbitfield mask ) /* 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. + * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the + * BUFFER_BIT_COLORn 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; + bufferMask = 0; + if (mask & GL_COLOR_BUFFER_BIT) { + bufferMask |= ctx->DrawBuffer->_ColorDrawBufferMask[0]; + } + + 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, ddMask, (GLboolean) !ctx->Scissor.Enabled, - x, y, width, height ); + ctx->Driver.Clear(ctx, bufferMask); } } + /** - * 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. + * 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 */ -void GLAPIENTRY -_mesa_DrawBuffer( GLenum mode ) +static GLbitfield +supported_buffer_bitmask(const GLcontext *ctx, const struct gl_framebuffer *fb) { - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */ + 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; + } - if (MESA_VERBOSE & VERBOSE_API) - _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); + for (i = 0; i < fb->Visual.numAuxBuffers; i++) { + mask |= (BUFFER_BIT_AUX0 << i); + } + } - /* - * Do error checking and compute the _DrawDestMask bitfield. - */ - switch (mode) { + 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: - /* never an error */ - if (ctx->Visual.stereoMode) - ctx->Color._DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT; - else - ctx->Color._DrawDestMask = FRONT_LEFT_BIT; - break; + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT; case GL_BACK: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK)"); - return; - } - if (ctx->Visual.stereoMode) - ctx->Color._DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = BACK_LEFT_BIT; - break; - case GL_NONE: - /* never an error */ - ctx->Color._DrawDestMask = 0; - break; -#if _HAVE_FULL_GL + return BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT; case GL_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_RIGHT)"); - return;} - if (ctx->Visual.doubleBufferMode) - ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = FRONT_RIGHT_BIT; - break; + return BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; case GL_FRONT_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_RIGHT)"); - return; - } - ctx->Color._DrawDestMask = FRONT_RIGHT_BIT; - break; + return BUFFER_BIT_FRONT_RIGHT; 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 = BACK_RIGHT_BIT; - break; + return BUFFER_BIT_BACK_RIGHT; case GL_BACK_LEFT: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_LEFT)"); - return; - } - ctx->Color._DrawDestMask = BACK_LEFT_BIT; - break; + return BUFFER_BIT_BACK_LEFT; 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 = FRONT_LEFT_BIT | BACK_LEFT_BIT - | FRONT_RIGHT_BIT | BACK_RIGHT_BIT; - else - ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; - break; + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT + | BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT; case GL_LEFT: - /* never an error */ - if (ctx->Visual.doubleBufferMode) - ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; - else - ctx->Color._DrawDestMask = FRONT_LEFT_BIT; - break; + return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT; case GL_FRONT_LEFT: - /* never an error */ - ctx->Color._DrawDestMask = FRONT_LEFT_BIT; - break; + return BUFFER_BIT_FRONT_LEFT; case GL_AUX0: - if (ctx->Const.NumAuxBuffers >= 1) { - ctx->Color._DrawDestMask = AUX0_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" ); - return; - } - break; + return BUFFER_BIT_AUX0; case GL_AUX1: - if (ctx->Const.NumAuxBuffers >= 2) { - ctx->Color._DrawDestMask = AUX1_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" ); - return; - } - break; + return BUFFER_BIT_AUX1; case GL_AUX2: - if (ctx->Const.NumAuxBuffers >= 3) { - ctx->Color._DrawDestMask = AUX2_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" ); - return; - } - break; + return BUFFER_BIT_AUX2; case GL_AUX3: - if (ctx->Const.NumAuxBuffers >= 4) { - ctx->Color._DrawDestMask = AUX3_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" ); - return; - } - break; -#endif + 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; + 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: + 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; default: - _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" ); + /* 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. + */ +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)"); return; + } + destMask &= supportedMask; + if (destMask == 0x0) { + /* none of the named color buffers exist! */ + _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(buffer)"); + return; + } } - ctx->Color.DrawBuffer = mode; - ctx->NewState |= _NEW_COLOR; + /* 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.DrawBuffer) - (*ctx->Driver.DrawBuffer)(ctx, mode); + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, 1, &buffer); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffer); } /** - * 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. + * 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_ReadBuffer( GLenum mode ) +_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); - if (MESA_VERBOSE & VERBOSE_API) - _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_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; + } - /* - * 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 = 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 = 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 = 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 = BACK_RIGHT_BIT; - break; - case GL_AUX0: - if (ctx->Const.NumAuxBuffers >= 1) { - ctx->Pixel._ReadSrcMask = AUX0_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" ); - return; - } - break; - case GL_AUX1: - if (ctx->Const.NumAuxBuffers >= 2) { - ctx->Pixel._ReadSrcMask = AUX1_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" ); + 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; - } - break; - case GL_AUX2: - if (ctx->Const.NumAuxBuffers >= 3) { - ctx->Pixel._ReadSrcMask = AUX2_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" ); + } + destMask[output] &= supportedMask; + if (destMask[output] == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(unsupported buffer)"); return; } - break; - case GL_AUX3: - if (ctx->Const.NumAuxBuffers >= 4) { - ctx->Pixel._ReadSrcMask = AUX3_BIT; - } - else { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" ); + if (destMask[output] & usedBufferMask) { + /* can't specify a dest buffer more than once! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(duplicated buffer)"); return; } - break; -#endif - default: - _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" ); - return; + + /* update bitmask */ + usedBufferMask |= destMask[output]; + } } - ctx->Pixel.ReadBuffer = mode; - ctx->NewState |= _NEW_PIXEL; + /* OK, if we get here, there were no errors so set the new state */ + _mesa_drawbuffers(ctx, n, buffers, destMask); + + /* + * Call device driver function. + */ + if (ctx->Driver.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, n, buffers); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffers[0]); +} + + +/** + * Set color output state. Traditionally, there was only one color + * output, but fragment programs can now have several distinct color + * outputs (see GL_ARB_draw_buffers). This function sets the state + * for one such color output. + * \param ctx current context + * \param output which fragment program output + * \param buffer buffer to write to (like GL_LEFT) + * \param destMask BUFFER_* bitmask + * (like BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT). + */ +static void +set_color_output(GLcontext *ctx, GLuint output, GLenum buffer, + GLbitfield destMask) +{ + struct gl_framebuffer *fb = ctx->DrawBuffer; + + ASSERT(output < ctx->Const.MaxDrawBuffers); + + /* Set per-FBO state */ + fb->ColorDrawBuffer[output] = buffer; + fb->_ColorDrawBufferMask[output] = destMask; + /* not really needed, will be set later */ + fb->_NumColorDrawBuffers[output] = 0; + + if (fb->Name == 0) + /* Set traditional state var */ + ctx->Color.DrawBuffer[output] = buffer; +} + + +/** + * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and + * other places (window fbo fixup) to set fbo (and the old ctx) fields. + * 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_* 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) +{ + GLbitfield mask[MAX_DRAW_BUFFERS]; + GLuint output; + + if (!destMask) { + /* compute destMask values now */ + const GLbitfield supportedMask + = supported_buffer_bitmask(ctx, ctx->DrawBuffer); + 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; + } + + for (output = 0; output < n; output++) { + set_color_output(ctx, output, buffers[output], destMask[output]); + } + + /* set remaining color outputs to NONE */ + for (output = n; output < ctx->Const.MaxDrawBuffers; output++) { + set_color_output(ctx, output, GL_NONE, 0x0); + } + + ctx->NewState |= _NEW_BUFFERS; +} + + +GLboolean +_mesa_readbuffer_update_fields(GLcontext *ctx, GLenum buffer) +{ + struct gl_framebuffer *fb; + GLbitfield supportedMask; + GLint srcBuffer; + + 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 GL_FALSE; + } + supportedMask = supported_buffer_bitmask(ctx, fb); + if (((1 << srcBuffer) & supportedMask) == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glReadBuffer(buffer=0x%x)", buffer); + return GL_FALSE; + } + } + + if (fb->Name == 0) { + ctx->Pixel.ReadBuffer = buffer; + } + fb->ColorReadBuffer = buffer; + fb->_ColorReadBufferIndex = srcBuffer; + + return GL_TRUE; +} + + + +/** + * 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) +{ + 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)); + + if (!_mesa_readbuffer_update_fields(ctx, buffer)) + return; + + ctx->NewState |= _NEW_BUFFERS; /* * Call device driver function. */ if (ctx->Driver.ReadBuffer) - (*ctx->Driver.ReadBuffer)(ctx, mode); + (*ctx->Driver.ReadBuffer)(ctx, buffer); } + #if _HAVE_FULL_GL /** + * XXX THIS IS OBSOLETE - drivers should take care of detecting window + * size changes and act accordingly, likely calling _mesa_resize_framebuffer(). + * * GL_MESA_resize_buffers extension. * * When this function is called, we'll ask the window system how large @@ -433,65 +611,78 @@ _mesa_ReadBuffer( GLenum mode ) * 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). + * \note This function should only be called through the GL API, not + * from device drivers (as was done in the past). */ -void GLAPIENTRY -_mesa_ResizeBuffersMESA( void ) + +void _mesa_resizebuffers( GLcontext *ctx ) { - GLcontext *ctx = _mesa_get_current_context(); + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( 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; + if (!ctx->Driver.GetBufferSize) { + return; + } - /* ask device driver for size of output buffer */ - (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height ); + if (ctx->WinSysDrawBuffer) { + GLuint newWidth, newHeight; + GLframebuffer *buffer = ctx->WinSysDrawBuffer; - /* 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 */ + assert(buffer->Name == 0); - buffer->Width = buf_width; - buffer->Height = buf_height; + /* ask device driver for size of output buffer */ + ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight ); - ctx->Driver.ResizeBuffers( buffer ); + /* see if size of device driver's color buffer (window) has changed */ + if (buffer->Width != newWidth || buffer->Height != newHeight) { + if (ctx->Driver.ResizeBuffers) + ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight ); } + } - 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 ); + if (ctx->WinSysReadBuffer + && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) { + GLuint newWidth, newHeight; + GLframebuffer *buffer = ctx->WinSysReadBuffer; - /* 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 */ + assert(buffer->Name == 0); - buffer->Width = buf_width; - buffer->Height = buf_height; + /* ask device driver for size of read buffer */ + ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight ); - ctx->Driver.ResizeBuffers( buffer ); + /* see if size of device driver's color buffer (window) has changed */ + if (buffer->Width != newWidth || buffer->Height != newHeight) { + if (ctx->Driver.ResizeBuffers) + ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight ); } - - ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */ } + + ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */ } + +/* + * XXX THIS IS OBSOLETE + */ +void GLAPIENTRY +_mesa_ResizeBuffersMESA( void ) +{ + GET_CURRENT_CONTEXT(ctx); + + if (ctx->Extensions.MESA_resize_buffers) + _mesa_resizebuffers( ctx ); +} + + /* * XXX move somewhere else someday? */ void GLAPIENTRY _mesa_SampleCoverageARB(GLclampf value, GLboolean invert) { - GLcontext *ctx = _mesa_get_current_context(); + GET_CURRENT_CONTEXT(ctx); if (!ctx->Extensions.ARB_multisample) { _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB"); @@ -504,7 +695,8 @@ _mesa_SampleCoverageARB(GLclampf value, GLboolean invert) ctx->NewState |= _NEW_MULTISAMPLE; } -#endif +#endif /* _HAVE_FULL_GL */ + /** @@ -520,20 +712,10 @@ _mesa_SampleCoverageARB(GLclampf value, GLboolean invert) * 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 ) +void +_mesa_set_scissor(GLcontext *ctx, + 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 && @@ -550,55 +732,36 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) 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 ) +void GLAPIENTRY +_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) { - 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; - } + 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); + + _mesa_set_scissor(ctx, x, y, width, 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. + * Initialize the context's scissor state. + * \param ctx the GL context. */ -void _mesa_init_buffers( GLcontext * ctx ) +void +_mesa_init_scissor(GLcontext *ctx) { /* Scissor group */ ctx->Scissor.Enabled = GL_FALSE; @@ -606,15 +769,22 @@ void _mesa_init_buffers( GLcontext * ctx ) ctx->Scissor.Y = 0; ctx->Scissor.Width = 0; ctx->Scissor.Height = 0; +} + - /* Multisample */ +/** + * Initialize the context's multisample state. + * \param ctx the GL context. + */ +void +_mesa_init_multisample(GLcontext *ctx) +{ 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; - } /*@}*/