r128_texstate.c

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

/* $XFree86: xc/lib/GL/mesa/src/drv/r128/r128_texstate.c,v 1.1 2002/02/22 21:44:58 dawes Exp $ */
/**************************************************************************

Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, Inc.,
                                               Cedar Park, Texas.
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"),
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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 NON-INFRINGEMENT. IN NO EVENT SHALL
ATI, PRECISION INSIGHT AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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**************************************************************************/

/*
 * Authors:
 *   Gareth Hughes <[e-mail]>
 *   Kevin E. Martin <[e-mail]>
 *   Brian Paul <[e-mail]>
 */

#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "macros.h"
#include "texformat.h"

#include "r128_context.h"
#include "r128_state.h"
#include "r128_ioctl.h"
#include "r128_tris.h"
#include "r128_tex.h"


static void r128SetTexImages( r128ContextPtr rmesa,
                              const struct gl_texture_object *tObj )
{
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;
   struct gl_texture_image *baseImage = tObj->Image[0][tObj->BaseLevel];
   int log2Pitch, log2Height, log2Size, log2MinSize;
   int totalSize;
   int i;
   GLint firstLevel, lastLevel;

   assert(t);
   assert(baseImage);

   if ( R128_DEBUG & DEBUG_VERBOSE_API )
      fprintf( stderr, "%s( %p )\n", __FUNCTION__, (void *) tObj );

   switch (baseImage->TexFormat->MesaFormat) {
   case MESA_FORMAT_ARGB8888:
   case MESA_FORMAT_ARGB8888_REV:
      t->textureFormat = R128_DATATYPE_ARGB8888;
      break;
   case MESA_FORMAT_ARGB4444:
   case MESA_FORMAT_ARGB4444_REV:
      t->textureFormat = R128_DATATYPE_ARGB4444;
      break;
   case MESA_FORMAT_RGB565:
   case MESA_FORMAT_RGB565_REV:
      t->textureFormat = R128_DATATYPE_RGB565;
      break;
   case MESA_FORMAT_RGB332:
      t->textureFormat = R128_DATATYPE_RGB8;
      break;
   case MESA_FORMAT_CI8:
      t->textureFormat = R128_DATATYPE_CI8;
      break;
   case MESA_FORMAT_YCBCR:
      t->textureFormat = R128_DATATYPE_YVYU422;
      break;
   case MESA_FORMAT_YCBCR_REV:
      t->textureFormat = R128_DATATYPE_VYUY422;
      break;
   default:
      _mesa_problem(rmesa->glCtx, "Bad texture format in %s", __FUNCTION__);
   };

   /* Compute which mipmap levels we really want to send to the hardware.
    */

   driCalculateTextureFirstLastLevel( (driTextureObject *) t );
   firstLevel = t->base.firstLevel;
   lastLevel  = t->base.lastLevel;

   log2Pitch = tObj->Image[0][firstLevel]->WidthLog2;
   log2Height = tObj->Image[0][firstLevel]->HeightLog2;
   log2Size = MAX2(log2Pitch, log2Height);
   log2MinSize = log2Size;

   t->base.dirty_images[0] = 0;
   totalSize = 0;
   for ( i = firstLevel; i <= lastLevel; i++ ) {
      const struct gl_texture_image *texImage;

      texImage = tObj->Image[0][i];
      if ( !texImage || !texImage->Data ) {
         lastLevel = i - 1;
	 break;
      }

      log2MinSize = texImage->MaxLog2;

      t->image[i - firstLevel].offset = totalSize;
      t->image[i - firstLevel].width  = tObj->Image[0][i]->Width;
      t->image[i - firstLevel].height = tObj->Image[0][i]->Height;

      t->base.dirty_images[0] |= (1 << i);

      totalSize += (tObj->Image[0][i]->Height *
		    tObj->Image[0][i]->Width *
		    tObj->Image[0][i]->TexFormat->TexelBytes);

      /* Offsets must be 32-byte aligned for host data blits and tiling */
      totalSize = (totalSize + 31) & ~31;
   }

   t->base.totalSize = totalSize;
   t->base.firstLevel = firstLevel;
   t->base.lastLevel = lastLevel;

   /* Set the texture format */
   t->setup.tex_cntl &= ~(0xf << 16);
   t->setup.tex_cntl |= t->textureFormat;

   t->setup.tex_combine_cntl = 0x00000000;  /* XXX is this right? */

   t->setup.tex_size_pitch = ((log2Pitch   << R128_TEX_PITCH_SHIFT) |
			      (log2Size    << R128_TEX_SIZE_SHIFT) |
			      (log2Height  << R128_TEX_HEIGHT_SHIFT) |
			      (log2MinSize << R128_TEX_MIN_SIZE_SHIFT));

   for ( i = 0 ; i < R128_MAX_TEXTURE_LEVELS ; i++ ) {
      t->setup.tex_offset[i]  = 0x00000000;
   }

   if (firstLevel == lastLevel)
      t->setup.tex_cntl |= R128_MIP_MAP_DISABLE;
   else
      t->setup.tex_cntl &= ~R128_MIP_MAP_DISABLE;

   /* FYI: r128UploadTexImages( rmesa, t ); used to be called here */
}


/* ================================================================
 * Texture combine functions
 */

#define COLOR_COMB_DISABLE		(R128_COMB_DIS |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_COPY_INPUT		(R128_COMB_COPY_INP |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_MODULATE		(R128_COMB_MODULATE |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_MODULATE_NTEX	(R128_COMB_MODULATE |		\
					 R128_COLOR_FACTOR_NTEX)
#define COLOR_COMB_ADD			(R128_COMB_ADD |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_BLEND_TEX		(R128_COMB_BLEND_TEXTURE |	\
					 R128_COLOR_FACTOR_TEX)
/* Rage 128 Pro/M3 only! */
#define COLOR_COMB_BLEND_COLOR		(R128_COMB_MODULATE2X |		\
					 R128_COMB_FCN_MSB |		\
					 R128_COLOR_FACTOR_CONST_COLOR)

#define ALPHA_COMB_DISABLE		(R128_COMB_ALPHA_DIS |		\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_COPY_INPUT		(R128_COMB_ALPHA_COPY_INP |	\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_MODULATE		(R128_COMB_ALPHA_MODULATE |	\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_MODULATE_NTEX	(R128_COMB_ALPHA_MODULATE |	\
					 R128_ALPHA_FACTOR_NTEX_ALPHA)
#define ALPHA_COMB_ADD			(R128_COMB_ALPHA_ADD |		\
					 R128_ALPHA_FACTOR_TEX_ALPHA)

#define INPUT_INTERP			(R128_INPUT_FACTOR_INT_COLOR |	\
					 R128_INP_FACTOR_A_INT_ALPHA)
#define INPUT_PREVIOUS			(R128_INPUT_FACTOR_PREV_COLOR |	\
					 R128_INP_FACTOR_A_PREV_ALPHA)

static GLboolean r128UpdateTextureEnv( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLint source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   const GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
   GLuint combine;

   if ( R128_DEBUG & DEBUG_VERBOSE_API ) {
      fprintf( stderr, "%s( %p, %d )\n",
	       __FUNCTION__, (void *) ctx, unit );
   }

   if ( unit == 0 ) {
      combine = INPUT_INTERP;
   } else {
      combine = INPUT_PREVIOUS;
   }

   /* Set the texture environment state */
   switch ( texUnit->EnvMode ) {
   case GL_REPLACE:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_DISABLE);		/* A = At            */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_DISABLE);		/* A = At            */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_MODULATE:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_MODULATE |		/* C = CfCt          */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_MODULATE |		/* C = CfCt          */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_DECAL:
      switch ( format ) {
      case GL_RGBA:
	 combine |= (COLOR_COMB_BLEND_TEX |		/* C = Cf(1-At)+CtAt */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_RGB:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
      case GL_LUMINANCE:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 /* Undefined behaviour - just copy the incoming fragment */
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = undefined     */
		     ALPHA_COMB_COPY_INPUT);		/* A = undefined     */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_BLEND:
      /* Rage 128 Pro and M3 can handle GL_BLEND texturing.
       */
      if ( !R128_IS_PLAIN( rmesa ) ) {
         /* XXX this hasn't been fully tested, I don't have a Pro card. -BP */
	 switch ( format ) {
	 case GL_RGBA:
	 case GL_LUMINANCE_ALPHA:
	    combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-Ct)+CcCt */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;

	 case GL_RGB:
	 case GL_LUMINANCE:
	    combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-Ct)+CcCt */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	    break;

	 case GL_ALPHA:
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;

	 case GL_INTENSITY:
	    /* GH: We could be smarter about this... */
	    switch ( rmesa->env_color & 0xff000000 ) {
	    case 0x00000000:
	       combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-It)+CcIt */
			   ALPHA_COMB_MODULATE_NTEX);	/* A = Af(1-It)      */
	    default:
	       combine |= (COLOR_COMB_MODULATE |	/* C = fallback      */
			   ALPHA_COMB_MODULATE);	/* A = fallback      */
	       return GL_FALSE;
	    }
	    break;