-/* $Id: buffers.c,v 1.37 2002/07/09 01:22:50 brianp Exp $ */
+/**
+ * \file buffers.c
+ * Frame buffer management.
+ */
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 6.0.1
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2004 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"),
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
-#include "accum.h"
+#include "imports.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 "state.h"
#include "mtypes.h"
-#endif
-
-void
+#if _HAVE_FULL_GL
+void GLAPIENTRY
_mesa_ClearIndex( GLfloat c )
{
GET_CURRENT_CONTEXT(ctx);
(*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 */
}
-
-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);
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;
}
if (!ctx->Depth.Mask)
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) {
+ /* 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.
+ */
+ 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;
ASSERT(ctx->Driver.Clear);
ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled,
}
-void
+/**
+ * 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.
+ */
+void GLAPIENTRY
_mesa_DrawBuffer( GLenum mode )
{
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(mode));
* Do error checking and compute the _DrawDestMask bitfield.
*/
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, "glDrawBuffer" );
- return;
+ 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_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
case GL_RIGHT:
if (!ctx->Visual.stereoMode) {
- _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_RIGHT)");
return;}
if (ctx->Visual.doubleBufferMode)
ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT;
break;
case GL_FRONT_RIGHT:
if (!ctx->Visual.stereoMode) {
- _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_RIGHT)");
return;
}
ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;
break;
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" );
+ 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;
case GL_BACK_LEFT:
if (!ctx->Visual.doubleBufferMode) {
- _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_BACK_LEFT)");
return;
}
ctx->Color._DrawDestMask = BACK_LEFT_BIT;
break;
case GL_FRONT_AND_BACK:
if (!ctx->Visual.doubleBufferMode) {
- _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_FRONT_AND_BACK)");
return;
}
if (ctx->Visual.stereoMode)
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;
case GL_LEFT:
/* never an error */
if (ctx->Visual.doubleBufferMode)
/* 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;
+ 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;
- case GL_NONE:
- /* never an error */
- ctx->Color._DrawDestMask = 0;
+ 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;
+ 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;
+ 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
default:
_mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );
return;
}
-
-void
+/**
+ * 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.
+ */
+void GLAPIENTRY
_mesa_ReadBuffer( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode));
+ /*
+ * Do error checking and compute ctx->Pixel._ReadSrcMask.
+ */
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;
+ ctx->Pixel._ReadSrcMask = FRONT_LEFT_BIT;
break;
case GL_BACK:
case GL_BACK_LEFT:
_mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" );
return;
}
- ctx->Pixel._DriverReadBuffer = GL_BACK_LEFT;
+ 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._DriverReadBuffer = GL_FRONT_RIGHT;
+ 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._DriverReadBuffer = GL_BACK_RIGHT;
+ 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)" );
+ 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)" );
+ 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)" );
+ return;
+ }
+ break;
+#endif
default:
_mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );
return;
(*ctx->Driver.ReadBuffer)(ctx, mode);
}
+#if _HAVE_FULL_GL
-/*
- * GL_MESA_resize_buffers extension
+/**
+ * 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 not what we expect, we'll have to
- * resize/reallocate the software accum/stencil/depth/alpha buffers.
+ * 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 may be called from within Mesa or called by the
+ * user directly (see the GL_MESA_resize_buffers extension).
*/
-void
+void GLAPIENTRY
_mesa_ResizeBuffersMESA( void )
{
GLcontext *ctx = _mesa_get_current_context();
if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) {
GLuint buf_width, buf_height;
- GLframebuffer *buffer = ctx->DrawBuffer;
+ GLframebuffer *buffer = ctx->ReadBuffer;
- /* ask device driver for size of output buffer */
+ /* ask device driver for size of read buffer */
(*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );
/* see if size of device driver's color buffer (window) has changed */
}
}
+/*
+ * XXX move somewhere else someday?
+ */
+void GLAPIENTRY
+_mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
+{
+ GLcontext *ctx = _mesa_get_current_context();
-void
+ if (!ctx->Extensions.ARB_multisample) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
+ 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;
+}
+
+#endif
+
+
+/**
+ * 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 GLAPIENTRY
_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
{
GET_CURRENT_CONTEXT(ctx);
ctx->Driver.Scissor( ctx, x, y, width, height );
}
+/**********************************************************************/
+/** \name State management */
+/*@{*/
-/*
- * XXX move somewhere else someday?
+/**
+ * Update screen bounds.
+ *
+ * \param ctx GL context.
+ *
+ * Update gl_frame_buffer::_Xmin, and etc.
*/
-void
-_mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
+void _mesa_update_buffers( GLcontext *ctx )
{
- GLcontext *ctx = _mesa_get_current_context();
-
- if (!ctx->Extensions.ARB_multisample) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
- return;
+ 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;
+ }
}
-
- 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;
}
+
+/*@}*/
+
+/**********************************************************************/
+/** \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.
+ */
+void _mesa_init_buffers( 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;
+
+ /* Multisample */
+ 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;
+
+}
+
+/*@}*/
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