mgatex.c

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

/*
 * Copyright 2000-2001 VA Linux Systems, Inc.
 * 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
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
 *
 * Authors:
 *    Keith Whitwell <[e-mail]>
 */
/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgatex.c,v 1.14 2002/10/30 12:51:36 alanh Exp $ */

#include "glheader.h"
#include "mm.h"
#include "mgacontext.h"
#include "mgatex.h"
#include "mgaregs.h"
#include "mgatris.h"
#include "mgaioctl.h"

#include "colormac.h"
#include "context.h"
#include "enums.h"
#include "simple_list.h"
#include "imports.h"
#include "macros.h"
#include "texformat.h"
#include "texstore.h"
#include "teximage.h"
#include "texobj.h"

#include "swrast/swrast.h"

#include "xmlpool.h"

/**
 * Set the texture wrap modes.
 * Currently \c GL_REPEAT, \c GL_CLAMP and \c GL_CLAMP_TO_EDGE are supported.
 * 
 * \param t Texture object whose wrap modes are to be set
 * \param swrap Wrap mode for the \a s texture coordinate
 * \param twrap Wrap mode for the \a t texture coordinate
 */

static void 
mgaSetTexWrapping( mgaTextureObjectPtr t, GLenum swrap, GLenum twrap )
{
   GLboolean  is_clamp = GL_FALSE;
   GLboolean  is_clamp_to_edge = GL_FALSE;

   t->setup.texctl &= (TMC_clampu_MASK & TMC_clampv_MASK);
   t->setup.texctl2 &= (TMC_borderen_MASK);

   switch( swrap ) {
   case GL_REPEAT:
      break;
   case GL_CLAMP:
      t->setup.texctl |= TMC_clampu_enable;
      is_clamp = GL_TRUE;
      break;
   case GL_CLAMP_TO_EDGE:
      t->setup.texctl |= TMC_clampu_enable;
      is_clamp_to_edge = GL_TRUE;
      break;
   default:
      _mesa_problem(NULL, "bad S wrap mode in %s", __FUNCTION__);
   }

   switch( twrap ) {
   case GL_REPEAT:
      break;
   case GL_CLAMP:
      t->setup.texctl |= TMC_clampv_enable;
      is_clamp = GL_TRUE;
      break;
   case GL_CLAMP_TO_EDGE:
      t->setup.texctl |= TMC_clampv_enable;
      is_clamp_to_edge = GL_TRUE;
      break;
   default:
      _mesa_problem(NULL, "bad T wrap mode in %s", __FUNCTION__);
   }

   if ( is_clamp ) {
      t->setup.texctl2 |= TMC_borderen_enable;
   }

   t->border_fallback = (is_clamp && is_clamp_to_edge);
}


/**
 * Set the texture magnification and minification modes.
 * 
 * \param t Texture whose filter modes are to be set
 * \param minf Texture minification mode
 * \param magf Texture magnification mode
 */

static void
mgaSetTexFilter( mgaTextureObjectPtr t, GLenum minf, GLenum magf )
{
   GLuint val = 0;

   switch (minf) {
   case GL_NEAREST: val = TF_minfilter_nrst; break;
   case GL_LINEAR: val = TF_minfilter_bilin; break;
   case GL_NEAREST_MIPMAP_NEAREST: val = TF_minfilter_mm1s; break;
   case GL_LINEAR_MIPMAP_NEAREST: val = TF_minfilter_mm4s; break;
   case GL_NEAREST_MIPMAP_LINEAR: val = TF_minfilter_mm2s; break;
   case GL_LINEAR_MIPMAP_LINEAR: val = TF_minfilter_mm8s; break;
   default: val = TF_minfilter_nrst; break;
   }

   switch (magf) {
   case GL_NEAREST: val |= TF_magfilter_nrst; break;
   case GL_LINEAR: val |= TF_magfilter_bilin; break;
   default: val |= TF_magfilter_nrst; break;
   }

   /* See OpenGL 1.2 specification */
   if (magf == GL_LINEAR && (minf == GL_NEAREST_MIPMAP_NEAREST ||
			     minf == GL_NEAREST_MIPMAP_LINEAR)) {
      val |= MGA_FIELD( TF_fthres, 0x20 ); /* c = 0.5 */
   } else {
      val |= MGA_FIELD( TF_fthres, 0x10 ); /* c = 0 */
   }


   /* Mask off the bits for the fields we are setting.  Remember, the MGA mask
    * defines have 0s for the bits in the named fields.  This is the opposite
    * of most of the other drivers.
    */

   t->setup.texfilter &= (TF_minfilter_MASK &
			  TF_magfilter_MASK &
			  TF_fthres_MASK);
   t->setup.texfilter |= val;
}

static void mgaSetTexBorderColor(mgaTextureObjectPtr t, GLubyte color[4])
{
   t->setup.texbordercol = PACK_COLOR_8888(color[3], color[0], 
					   color[1], color[2] );
}


static const struct gl_texture_format *
mgaChooseTextureFormat( GLcontext *ctx, GLint internalFormat,
		        GLenum format, GLenum type )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   const GLboolean do32bpt =
       ( mmesa->texture_depth == DRI_CONF_TEXTURE_DEPTH_32 );
   const GLboolean force16bpt =
       ( mmesa->texture_depth == DRI_CONF_TEXTURE_DEPTH_FORCE_16 );
   (void) format;

   switch ( internalFormat ) {
   case 4:
   case GL_RGBA:
   case GL_COMPRESSED_RGBA:
      switch ( type ) {
      case GL_UNSIGNED_INT_10_10_10_2:
      case GL_UNSIGNED_INT_2_10_10_10_REV:
	 return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_argb1555;
      case GL_UNSIGNED_SHORT_4_4_4_4:
      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
	 return &_mesa_texformat_argb4444;
      case GL_UNSIGNED_SHORT_5_5_5_1:
      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
	 return &_mesa_texformat_argb1555;
      default:
         return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_argb4444;
      }

   case 3:
   case GL_RGB:
   case GL_COMPRESSED_RGB:
      switch ( type ) {
      case GL_UNSIGNED_SHORT_4_4_4_4:
      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
	 return &_mesa_texformat_argb4444;
      case GL_UNSIGNED_SHORT_5_5_5_1:
      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
	 return &_mesa_texformat_argb1555;
      case GL_UNSIGNED_SHORT_5_6_5:
      case GL_UNSIGNED_SHORT_5_6_5_REV:
	 return &_mesa_texformat_rgb565;
      default:
         return do32bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_rgb565;
      }

   case GL_RGBA8:
   case GL_RGB10_A2:
   case GL_RGBA12:
   case GL_RGBA16:
      return !force16bpt ?
	  &_mesa_texformat_argb8888 : &_mesa_texformat_argb4444;

   case GL_RGBA4:
   case GL_RGBA2:
      return &_mesa_texformat_argb4444;

   case GL_RGB5_A1:
      return &_mesa_texformat_argb1555;

   case GL_RGB8:
   case GL_RGB10:
   case GL_RGB12:
   case GL_RGB16:
      return !force16bpt ? &_mesa_texformat_argb8888 : &_mesa_texformat_rgb565;

   case GL_RGB5:
   case GL_RGB4:
   case GL_R3_G3_B2:
      return &_mesa_texformat_rgb565;

   case GL_ALPHA:
   case GL_ALPHA4:
   case GL_ALPHA8:
   case GL_ALPHA12:
   case GL_ALPHA16:
   case GL_COMPRESSED_ALPHA:
      /* FIXME: This will report incorrect component sizes... */
      return MGA_IS_G400(mmesa) ? &_mesa_texformat_al88 : &_mesa_texformat_argb4444;

   case 1:
   case GL_LUMINANCE:
   case GL_LUMINANCE4:
   case GL_LUMINANCE8:
   case GL_LUMINANCE12:
   case GL_LUMINANCE16:
   case GL_COMPRESSED_LUMINANCE:
      /* FIXME: This will report incorrect component sizes... */
      return MGA_IS_G400(mmesa) ? &_mesa_texformat_al88 : &_mesa_texformat_rgb565;

   case 2:
   case GL_LUMINANCE_ALPHA:
   case GL_LUMINANCE4_ALPHA4:
   case GL_LUMINANCE6_ALPHA2:
   case GL_LUMINANCE8_ALPHA8:
   case GL_LUMINANCE12_ALPHA4:
   case GL_LUMINANCE12_ALPHA12:
   case GL_LUMINANCE16_ALPHA16:
   case GL_COMPRESSED_LUMINANCE_ALPHA:
      /* FIXME: This will report incorrect component sizes... */
      return MGA_IS_G400(mmesa) ? &_mesa_texformat_al88 : &_mesa_texformat_argb4444;

   case GL_INTENSITY:
   case GL_INTENSITY4:
   case GL_INTENSITY8:
   case GL_INTENSITY12:
   case GL_INTENSITY16:
   case GL_COMPRESSED_INTENSITY: