tdfx_render.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/* -*- mode: c; c-basic-offset: 3 -*-
 *
 * Copyright 2000 VA Linux Systems Inc., Fremont, California.
 *
 * 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 (including the next
 * paragraph) 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
 * VA LINUX SYSTEMS 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.
 */
/* $XFree86: xc/lib/GL/mesa/src/drv/tdfx/tdfx_render.c,v 1.4 2002/02/22 21:45:03 dawes Exp $ */

/*
 * New fixes:
 *	Daniel Borca <[e-mail]>, 19 Jul 2004
 *
 * Original rewrite:
 *	Gareth Hughes <[e-mail]>, 29 Sep - 1 Oct 2000
 *
 * Authors:
 *	Gareth Hughes <[e-mail]>
 *	Brian Paul <[e-mail]>
 *
 */

#include "tdfx_context.h"
#include "tdfx_render.h"
#include "tdfx_state.h"
#include "tdfx_texman.h"
#include "swrast/swrast.h"

/* Clear the color and/or depth buffers.
 */
static void tdfxClear( GLcontext *ctx, GLbitfield mask )
{
   tdfxContextPtr fxMesa = (tdfxContextPtr) ctx->DriverCtx;
   GLbitfield softwareMask = mask & (BUFFER_BIT_ACCUM);
   const GLuint stencil_size =
      fxMesa->haveHwStencil ? fxMesa->glCtx->Visual.stencilBits : 0;

   if ( TDFX_DEBUG & DEBUG_VERBOSE_API ) {
      fprintf( stderr, "tdfxClear(0x%x)\n", mask);
   }

   /* Need this check to respond to glScissor and clipping updates */
   if ((fxMesa->new_state & (TDFX_NEW_CLIP | TDFX_NEW_DEPTH)) ||
       (fxMesa->dirty & TDFX_UPLOAD_COLOR_MASK)) {
      tdfxDDUpdateHwState(ctx);
   }

   /* we can't clear accum buffers */
   mask &= ~(BUFFER_BIT_ACCUM);

   if (mask & BUFFER_BIT_STENCIL) {
      if (!fxMesa->haveHwStencil || (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
         /* Napalm seems to have trouble with stencil write masks != 0xff */
         /* do stencil clear in software */
         mask &= ~(BUFFER_BIT_STENCIL);
         softwareMask |= BUFFER_BIT_STENCIL;
      }
   }

   if (fxMesa->glCtx->Visual.redBits != 8) {
      /* can only do color masking if running in 24/32bpp on Napalm */
      if (ctx->Color.ColorMask[RCOMP] != ctx->Color.ColorMask[GCOMP] ||
          ctx->Color.ColorMask[GCOMP] != ctx->Color.ColorMask[BCOMP]) {
         softwareMask |= (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT));
         mask &= ~(BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT);
      }
   }

   if (fxMesa->haveHwStencil) {
      /*
       * If we want to clear stencil, it must be enabled
       * in the HW, even if the stencil test is not enabled
       * in the OGL state.
       */
      LOCK_HARDWARE(fxMesa);
      if (mask & BUFFER_BIT_STENCIL) {
	 fxMesa->Glide.grStencilMask(/*ctx->Stencil.WriteMask*/ 0xff);
	 /* set stencil ref value = desired clear value */
	 fxMesa->Glide.grStencilFunc(GR_CMP_ALWAYS,
                                     (fxMesa->Stencil.Clear & 0xff), 0xff);
	 fxMesa->Glide.grStencilOp(GR_STENCILOP_REPLACE,
                                   GR_STENCILOP_REPLACE, GR_STENCILOP_REPLACE);
	 fxMesa->Glide.grEnable(GR_STENCIL_MODE_EXT);
      }
      else {
	 fxMesa->Glide.grDisable(GR_STENCIL_MODE_EXT);
      }
      UNLOCK_HARDWARE(fxMesa);
   }

   /*
    * This may be ugly, but it's needed in order to work around a number
    * of Glide bugs.
    */
   BEGIN_CLIP_LOOP(fxMesa);
   {
      /*
       * This could probably be done fancier but doing each possible case
       * explicitly is less error prone.
       */
      switch (mask & ~BUFFER_BIT_STENCIL) {
      case BUFFER_BIT_BACK_LEFT | BUFFER_BIT_DEPTH:
	 /* back buffer & depth */
	 FX_grColorMaskv_NoLock(ctx, true4); /* work around Voodoo3 bug */
	 fxMesa->Glide.grDepthMask(FXTRUE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
	 if (stencil_size > 0) {
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
         }
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (!ctx->Depth.Mask || !ctx->Depth.Test) {
            fxMesa->Glide.grDepthMask(FXFALSE);
	 }
	 break;
      case BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_DEPTH:
	 /* XXX it appears that the depth buffer isn't cleared when
	  * glRenderBuffer(GR_BUFFER_FRONTBUFFER) is set.
	  * This is a work-around/
	  */
	 /* clear depth */
	 fxMesa->Glide.grDepthMask(FXTRUE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
	 FX_grColorMaskv_NoLock(ctx, false4);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear & 0xff);
	 /* clear front */
	 FX_grColorMaskv_NoLock(ctx, true4);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_FRONTBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (!ctx->Depth.Mask || !ctx->Depth.Test) {
            fxMesa->Glide.grDepthMask(FXFALSE);
	 }
	 break;
      case BUFFER_BIT_BACK_LEFT:
	 /* back buffer only */
	 fxMesa->Glide.grDepthMask(FXFALSE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (ctx->Depth.Mask && ctx->Depth.Test) {
            fxMesa->Glide.grDepthMask(FXTRUE);
	 }
	 break;
      case BUFFER_BIT_FRONT_LEFT:
	 /* front buffer only */
	 fxMesa->Glide.grDepthMask(FXFALSE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_FRONTBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (ctx->Depth.Mask && ctx->Depth.Test) {
            fxMesa->Glide.grDepthMask(FXTRUE);
	 }
	 break;
      case BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT:
	 /* front and back */
	 fxMesa->Glide.grDepthMask(FXFALSE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_FRONTBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (ctx->Depth.Mask && ctx->Depth.Test) {
            fxMesa->Glide.grDepthMask(FXTRUE);
	 }
	 break;
      case BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT | BUFFER_BIT_DEPTH:
	 /* clear front */
	 fxMesa->Glide.grDepthMask(FXFALSE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_FRONTBUFFER);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 /* clear back and depth */
	 fxMesa->Glide.grDepthMask(FXTRUE);
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
         if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,
                                           fxMesa->Color.ClearAlpha,
                                           fxMesa->Depth.Clear,
                                           (FxU32) (ctx->Stencil.Clear & 0xff));
	 else
            fxMesa->Glide.grBufferClear(fxMesa->Color.ClearColor,
                                        fxMesa->Color.ClearAlpha,
                                        fxMesa->Depth.Clear);
	 if (!ctx->Depth.Mask || !ctx->Depth.Mask) {
            fxMesa->Glide.grDepthMask(FXFALSE);
	 }
	 break;
      case BUFFER_BIT_DEPTH:
	 /* just the depth buffer */
	 fxMesa->Glide.grRenderBuffer(GR_BUFFER_BACKBUFFER);
	 FX_grColorMaskv_NoLock(ctx, false4);
	 fxMesa->Glide.grDepthMask(FXTRUE);
	 if (stencil_size > 0)
            fxMesa->Glide.grBufferClearExt(fxMesa->Color.ClearColor,