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/* $Id: buffers.c,v 1.1 2003-02-28 11:41:58 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.1

 *

 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

#include "glheader.h"

#include "imports.h"

#include "accum.h"

#include "buffers.h"

#include "colormac.h"

#include "context.h"

#include "depth.h"

#include "enums.h"

#include "macros.h"

#include "stencil.h"

#include "state.h"

#include "mtypes.h"

void

_mesa_ClearIndex( GLfloat c )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Color.ClearIndex == (GLuint) c)

      return;

   FLUSH_VERTICES(ctx, _NEW_COLOR);

   ctx->Color.ClearIndex = (GLuint) c;

   if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {

      /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */

      (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );

   }

}

void

_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )

{

   GLfloat tmp[4];

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   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; /* no change */

   FLUSH_VERTICES(ctx, _NEW_COLOR);

   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 */

      (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);

   }

}

void

_mesa_Clear( GLbitfield mask )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (MESA_VERBOSE & VERBOSE_API)

      _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)");

      return;

   }

   if (ctx->NewState) {

      _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;

      /* don't clear depth buffer if depth writing disabled */

      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) {

         ddMask |= ctx->Color._DrawDestMask;

      }

      ASSERT(ctx->Driver.Clear);

      ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled,

                         x, y, width, height );

   }

}

void

_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_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;

      case GL_FRONT_RIGHT:

         if (!ctx->Visual.stereoMode) {

            _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );

            return;

         }

         ctx->Color._DrawDestMask = FRONT_RIGHT_BIT;

         break;

      case GL_BACK_RIGHT:

         if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) {

            _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" );

            return;

         }

         ctx->Color._DrawDestMask = BACK_RIGHT_BIT;

         break;

      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;

      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;

      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;

      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_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;

      default:

         _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" );

         return;

   }

   ctx->Color.DrawBuffer = mode;

   ctx->NewState |= _NEW_COLOR;

   /*

    * Call device driver function.

    */

   if (ctx->Driver.DrawBuffer)

      (*ctx->Driver.DrawBuffer)(ctx, mode);

}

void

_mesa_ReadBuffer( GLenum mode )

{

   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));

   /*

    * 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;

      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)" );

            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;

      default:

         _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" );

         return;

   }

   ctx->Pixel.ReadBuffer = mode;

   ctx->NewState |= _NEW_PIXEL;

   /*

    * Call device driver function.

    */

   if (ctx->Driver.ReadBuffer)

      (*ctx->Driver.ReadBuffer)(ctx, mode);

}

/*

 * 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.

 */

void

_mesa_ResizeBuffersMESA( void )

{

   GLcontext *ctx = _mesa_get_current_context();

   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;

         /* ask device driver for size of output buffer */

         (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );

         /* 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 */

         buffer->Width = buf_width;

         buffer->Height = buf_height;

         ctx->Driver.ResizeBuffers( buffer );

      }

      if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) {

         GLuint buf_width, buf_height;

         GLframebuffer *buffer = ctx->DrawBuffer;

         /* ask device driver for size of output buffer */

         (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height );

         /* 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 */

         buffer->Width = buf_width;

         buffer->Height = buf_height;

         ctx->Driver.ResizeBuffers( buffer );

      }

      ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */

   }

}

void

_mesa_Scissor( 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 &&

       height == ctx->Scissor.Height)

      return;

   FLUSH_VERTICES(ctx, _NEW_SCISSOR);

   ctx->Scissor.X = x;

   ctx->Scissor.Y = y;

   ctx->Scissor.Width = width;

   ctx->Scissor.Height = height;

   if (ctx->Driver.Scissor)

      ctx->Driver.Scissor( ctx, x, y, width, height );

}

/*

 * XXX move somewhere else someday?

 */

void

_mesa_SampleCoverageARB(GLclampf value, GLboolean invert)

{

   GLcontext *ctx = _mesa_get_current_context();

   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;

}