-/**
- * \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"),
*/
+/**
+ * \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
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);
_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)
/* 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.
+ * <buffer> 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
* 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");
ctx->NewState |= _NEW_MULTISAMPLE;
}
-#endif
+#endif /* _HAVE_FULL_GL */
+
/**
* 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 &&
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;
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;
-
}
/*@}*/
projects / mesa.git / blobdiff