X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Fbuffers.c;h=3cbd671baba794e9b9fe7c7814a3b82dadcf2edd;hb=ff938bf059a41a9bdf4c2c93cebe4a3b8a89c201;hp=b4feb219fbff64f3834042cad4c752cf001284a3;hpb=70b8d304bb5224698aaf9d76dd603c8293d0bbf3;p=mesa.git diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c index b4feb219fbf..3cbd671baba 100644 --- a/src/mesa/main/buffers.c +++ b/src/mesa/main/buffers.c @@ -1,10 +1,8 @@ -/* $Id: buffers.c,v 1.32 2002/02/15 16:25:16 brianp Exp $ */ - /* * Mesa 3-D graphics library - * Version: 4.1 + * Version: 7.1 * - * Copyright (C) 1999-2002 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"), @@ -25,26 +23,27 @@ */ -#ifdef PC_HEADER -#include "all.h" -#else +/** + * \file buffers.c + * General framebuffer-related functions, like glClear, glScissor, etc. + */ + + + #include "glheader.h" -#include "accum.h" #include "buffers.h" #include "colormac.h" #include "context.h" -#include "depth.h" #include "enums.h" -#include "macros.h" -#include "mem.h" -#include "stencil.h" +#include "fbobject.h" #include "state.h" -#include "mtypes.h" -#endif +#define BAD_MASK ~0u -void + +#if _HAVE_FULL_GL +void GLAPIENTRY _mesa_ClearIndex( GLfloat c ) { GET_CURRENT_CONTEXT(ctx); @@ -61,26 +60,40 @@ _mesa_ClearIndex( GLfloat c ) (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex ); } } +#endif - -void +/** + * 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 ) { - GLchan tmp[4]; + GLfloat tmp[4]; GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END(ctx); - UNCLAMPED_FLOAT_TO_CHAN(tmp[0], red); - UNCLAMPED_FLOAT_TO_CHAN(tmp[1], green); - UNCLAMPED_FLOAT_TO_CHAN(tmp[2], blue); - UNCLAMPED_FLOAT_TO_CHAN(tmp[3], alpha); + 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; + return; /* no change */ FLUSH_VERTICES(ctx, _NEW_COLOR); - COPY_CHAN4(ctx->Color.ClearColor, tmp); + 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 */ @@ -89,22 +102,33 @@ _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha ) } - -void +/** + * Clear buffers. + * + * \param mask bit-mask indicating the buffers to be cleared. + * + * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState + * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin, + * etc. If the rasterization mode is set to GL_RENDER then requests the driver + * to clear the buffers, via the dd_function_table::Clear callback. + */ +void GLAPIENTRY _mesa_Clear( GLbitfield mask ) { GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); + FLUSH_CURRENT(ctx, 0); + if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glClear 0x%x\n", mask); + _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(mask)"); + _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask); return; } @@ -112,288 +136,586 @@ _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) - 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); + mask &= ~GL_DEPTH_BUFFER_BIT; + + /* Build the bitmask to send to device driver's Clear function. + * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4 + * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the + * BUFFER_BIT_COLORn flags. + */ + bufferMask = 0; if (mask & GL_COLOR_BUFFER_BIT) { - ddMask |= ctx->Color.DrawDestMask; + 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); } } -void -_mesa_DrawBuffer( GLenum mode ) + +/** + * 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) { - 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; + } + + for (i = 0; i < fb->Visual.numAuxBuffers; i++) { + mask |= (BUFFER_BIT_AUX0 << i); + } + } + return mask; +} - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); - switch (mode) { +/** + * 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: + return BUFFER_BIT_AUX1; case GL_AUX2: + return BUFFER_BIT_AUX2; case GL_AUX3: - /* AUX buffers not implemented in Mesa at this time */ - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; + 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: - if (!ctx->Visual.stereoMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return;} - if (ctx->Visual.doubleBufferMode) - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT; - else - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT; - break; + return BUFFER_FRONT_RIGHT; case GL_FRONT_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - ctx->Color.DrawDestMask = FRONT_RIGHT_BIT; - break; + return BUFFER_FRONT_RIGHT; case GL_BACK_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - if (!ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - ctx->Color.DrawDestMask = BACK_RIGHT_BIT; - break; + return BUFFER_BACK_RIGHT; case GL_BACK_LEFT: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - ctx->Color.DrawDestMask = BACK_LEFT_BIT; - break; - case GL_FRONT_AND_BACK: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - 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; - case GL_BACK: - if (!ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); - return; - } - if (ctx->Visual.stereoMode) - ctx->Color.DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT; - else - ctx->Color.DrawDestMask = BACK_LEFT_BIT; - break; + return BUFFER_BACK_LEFT; 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_FRONT_LEFT; case GL_FRONT_LEFT: - /* never an error */ - ctx->Color.DrawDestMask = FRONT_LEFT_BIT; - break; - 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; - case GL_NONE: - /* never an error */ - ctx->Color.DrawDestMask = 0; - break; + 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" ); - return; + /* error */ + return -1; } +} - /* - * Make the dest buffer mode more precise if possible - */ - if (mode == GL_LEFT && !ctx->Visual.doubleBufferMode) - ctx->Color.DriverDrawBuffer = GL_FRONT_LEFT; - else if (mode == GL_RIGHT && !ctx->Visual.doubleBufferMode) - ctx->Color.DriverDrawBuffer = GL_FRONT_RIGHT; - else if (mode == GL_FRONT && !ctx->Visual.stereoMode) - ctx->Color.DriverDrawBuffer = GL_FRONT_LEFT; - else if (mode == GL_BACK && !ctx->Visual.stereoMode) - 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; +/** + * 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 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. - */ - 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; + if (buffer == GL_NONE) { + destMask = 0x0; } 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); + 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.DrawBuffers) + ctx->Driver.DrawBuffers(ctx, 1, &buffer); + else if (ctx->Driver.DrawBuffer) + ctx->Driver.DrawBuffer(ctx, buffer); +} -void -_mesa_ReadBuffer( 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); - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "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; + } - switch (mode) { - case GL_AUX0: - case GL_AUX1: - case GL_AUX2: - case GL_AUX3: - /* AUX buffers not implemented in Mesa at this time */ - _mesa_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.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + 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->Pixel.DriverReadBuffer = GL_BACK_LEFT; - break; - case GL_FRONT_RIGHT: - case GL_RIGHT: - if (!ctx->Visual.stereoMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + } + destMask[output] &= supportedMask; + if (destMask[output] == 0) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(unsupported buffer)"); return; } - ctx->Pixel.DriverReadBuffer = GL_FRONT_RIGHT; - break; - case GL_BACK_RIGHT: - if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { - _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); + if (destMask[output] & usedBufferMask) { + /* can't specify a dest buffer more than once! */ + _mesa_error(ctx, GL_INVALID_OPERATION, + "glDrawBuffersARB(duplicated buffer)"); return; } - ctx->Pixel.DriverReadBuffer = GL_BACK_RIGHT; - break; - 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]); } -/* - * GL_MESA_resize_buffers extension +/** + * 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_ResizeBuffersMESA( void ) +_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers, + const GLbitfield *destMask) { - GLcontext *ctx = _mesa_get_current_context(); - GLuint buf_width, buf_height; - ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); + 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) - fprintf(stderr, "glResizeBuffersMESA\n"); + _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer)); + + if (!_mesa_readbuffer_update_fields(ctx, buffer)) + return; + + ctx->NewState |= _NEW_BUFFERS; - /* ask device driver for size of output buffer */ - (*ctx->Driver.GetBufferSize)( ctx, &buf_width, &buf_height ); + /* + * Call device driver function. + */ + if (ctx->Driver.ReadBuffer) + (*ctx->Driver.ReadBuffer)(ctx, buffer); +} - /* 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) + +#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 + * 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 should only be called through the GL API, not + * from device drivers (as was done in the past). + */ + +void _mesa_resizebuffers( GLcontext *ctx ) +{ + ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glResizeBuffersMESA\n"); + + if (!ctx->Driver.GetBufferSize) { return; + } + + if (ctx->WinSysDrawBuffer) { + GLuint newWidth, newHeight; + GLframebuffer *buffer = ctx->WinSysDrawBuffer; + + assert(buffer->Name == 0); + + /* ask device driver for size of output buffer */ + ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight ); + + /* 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->WinSysReadBuffer + && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) { + GLuint newWidth, newHeight; + GLframebuffer *buffer = ctx->WinSysReadBuffer; + + assert(buffer->Name == 0); + + /* ask device driver for size of read buffer */ + ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight ); + + /* 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 */ +} + - /* save buffer size */ - ctx->DrawBuffer->Width = buf_width; - ctx->DrawBuffer->Height = buf_height; +/* + * XXX THIS IS OBSOLETE + */ +void GLAPIENTRY +_mesa_ResizeBuffersMESA( void ) +{ + GET_CURRENT_CONTEXT(ctx); - ctx->Driver.ResizeBuffersMESA( ctx ); + if (ctx->Extensions.MESA_resize_buffers) + _mesa_resizebuffers( ctx ); } -void -_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) +/* + * XXX move somewhere else someday? + */ +void GLAPIENTRY +_mesa_SampleCoverageARB(GLclampf value, GLboolean invert) { GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END(ctx); - if (width < 0 || height < 0) { - _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" ); + if (!ctx->Extensions.ARB_multisample) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB"); return; } - if (MESA_VERBOSE & VERBOSE_API) - fprintf(stderr, "glScissor %d %d %d %d\n", x, y, width, height); + 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 /* _HAVE_FULL_GL */ + + + +/** + * 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 +_mesa_set_scissor(GLcontext *ctx, + GLint x, GLint y, GLsizei width, GLsizei height) +{ if (x == ctx->Scissor.X && y == ctx->Scissor.Y && width == ctx->Scissor.Width && @@ -411,22 +733,58 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) } -/* - * XXX move somewhere else someday? - */ -void -_mesa_SampleCoverageARB(GLclampf value, GLboolean invert) +void GLAPIENTRY +_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) { - GLcontext *ctx = _mesa_get_current_context(); + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); - if (!ctx->Extensions.ARB_multisample) { - _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB"); + if (width < 0 || height < 0) { + _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" ); 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; + 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's scissor state. + * \param ctx the GL context. + */ +void +_mesa_init_scissor(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; +} + + +/** + * 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; +} + +/*@}*/