gbm: track buffer format through DRI drivers

[mesa.git] / src / mesa / drivers / dri / radeon / radeon_texstate.c

/**************************************************************************

Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
                     VA Linux Systems Inc., Fremont, California.

All Rights Reserved.

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next paragraph) shall be included in all copies or substantial
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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/*
 * Authors:
 *   Kevin E. Martin <martin@valinux.com>
 *   Gareth Hughes <gareth@valinux.com>
 */

#include "main/glheader.h"
#include "main/imports.h"
#include "main/colormac.h"
#include "main/context.h"
#include "main/macros.h"
#include "main/teximage.h"
#include "main/texstate.h"
#include "main/texobj.h"
#include "main/enums.h"

#include "radeon_context.h"
#include "radeon_mipmap_tree.h"
#include "radeon_state.h"
#include "radeon_ioctl.h"
#include "radeon_swtcl.h"
#include "radeon_tex.h"
#include "radeon_tcl.h"


#define RADEON_TXFORMAT_A8        RADEON_TXFORMAT_I8
#define RADEON_TXFORMAT_L8        RADEON_TXFORMAT_I8
#define RADEON_TXFORMAT_AL88      RADEON_TXFORMAT_AI88
#define RADEON_TXFORMAT_YCBCR     RADEON_TXFORMAT_YVYU422
#define RADEON_TXFORMAT_YCBCR_REV RADEON_TXFORMAT_VYUY422
#define RADEON_TXFORMAT_RGB_DXT1  RADEON_TXFORMAT_DXT1
#define RADEON_TXFORMAT_RGBA_DXT1 RADEON_TXFORMAT_DXT1
#define RADEON_TXFORMAT_RGBA_DXT3 RADEON_TXFORMAT_DXT23
#define RADEON_TXFORMAT_RGBA_DXT5 RADEON_TXFORMAT_DXT45

#define _COLOR(f) \
    [ MESA_FORMAT_ ## f ] = { RADEON_TXFORMAT_ ## f, 0 }
#define _COLOR_REV(f) \
    [ MESA_FORMAT_ ## f ## _REV ] = { RADEON_TXFORMAT_ ## f, 0 }
#define _ALPHA(f) \
    [ MESA_FORMAT_ ## f ] = { RADEON_TXFORMAT_ ## f | RADEON_TXFORMAT_ALPHA_IN_MAP, 0 }
#define _ALPHA_REV(f) \
    [ MESA_FORMAT_ ## f ## _REV ] = { RADEON_TXFORMAT_ ## f | RADEON_TXFORMAT_ALPHA_IN_MAP, 0 }
#define _YUV(f) \
   [ MESA_FORMAT_ ## f ] = { RADEON_TXFORMAT_ ## f, RADEON_YUV_TO_RGB }
#define _INVALID(f) \
    [ MESA_FORMAT_ ## f ] = { 0xffffffff, 0 }
#define VALID_FORMAT(f) ( ((f) <= MESA_FORMAT_RGBA_DXT5) \
                             && (tx_table[f].format != 0xffffffff) )

struct tx_table {
   GLuint format, filter;
};

/* XXX verify this table against MESA_FORMAT_x values */
static const struct tx_table tx_table[] =
{
   _INVALID(NONE), /* MESA_FORMAT_NONE */
   _ALPHA(RGBA8888),
   _ALPHA_REV(RGBA8888),
   _ALPHA(ARGB8888),
   _ALPHA_REV(ARGB8888),
   [ MESA_FORMAT_RGB888 ] = { RADEON_TXFORMAT_ARGB8888, 0 },
   _COLOR(RGB565),
   _COLOR_REV(RGB565),
   _ALPHA(ARGB4444),
   _ALPHA_REV(ARGB4444),
   _ALPHA(ARGB1555),
   _ALPHA_REV(ARGB1555),
   _ALPHA(AL88),
   _ALPHA_REV(AL88),
   _ALPHA(A8),
   _COLOR(L8),
   _ALPHA(I8),
   _YUV(YCBCR),
   _YUV(YCBCR_REV),
   _INVALID(RGB_FXT1),
   _INVALID(RGBA_FXT1),
   _COLOR(RGB_DXT1),
   _ALPHA(RGBA_DXT1),
   _ALPHA(RGBA_DXT3),
   _ALPHA(RGBA_DXT5),
};

#undef _COLOR
#undef _ALPHA
#undef _INVALID

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

/* GL_ARB_texture_env_combine support
 */

/* The color tables have combine functions for GL_SRC_COLOR,
 * GL_ONE_MINUS_SRC_COLOR, GL_SRC_ALPHA and GL_ONE_MINUS_SRC_ALPHA.
 */
static GLuint radeon_texture_color[][RADEON_MAX_TEXTURE_UNITS] =
{
   {
      RADEON_COLOR_ARG_A_T0_COLOR,
      RADEON_COLOR_ARG_A_T1_COLOR,
      RADEON_COLOR_ARG_A_T2_COLOR
   },
   {
      RADEON_COLOR_ARG_A_T0_COLOR | RADEON_COMP_ARG_A,
      RADEON_COLOR_ARG_A_T1_COLOR | RADEON_COMP_ARG_A,
      RADEON_COLOR_ARG_A_T2_COLOR | RADEON_COMP_ARG_A
   },
   {
      RADEON_COLOR_ARG_A_T0_ALPHA,
      RADEON_COLOR_ARG_A_T1_ALPHA,
      RADEON_COLOR_ARG_A_T2_ALPHA
   },
   {
      RADEON_COLOR_ARG_A_T0_ALPHA | RADEON_COMP_ARG_A,
      RADEON_COLOR_ARG_A_T1_ALPHA | RADEON_COMP_ARG_A,
      RADEON_COLOR_ARG_A_T2_ALPHA | RADEON_COMP_ARG_A
   },
};

static GLuint radeon_tfactor_color[] =
{
   RADEON_COLOR_ARG_A_TFACTOR_COLOR,
   RADEON_COLOR_ARG_A_TFACTOR_COLOR | RADEON_COMP_ARG_A,
   RADEON_COLOR_ARG_A_TFACTOR_ALPHA,
   RADEON_COLOR_ARG_A_TFACTOR_ALPHA | RADEON_COMP_ARG_A
};

static GLuint radeon_primary_color[] =
{
   RADEON_COLOR_ARG_A_DIFFUSE_COLOR,
   RADEON_COLOR_ARG_A_DIFFUSE_COLOR | RADEON_COMP_ARG_A,
   RADEON_COLOR_ARG_A_DIFFUSE_ALPHA,
   RADEON_COLOR_ARG_A_DIFFUSE_ALPHA | RADEON_COMP_ARG_A
};

static GLuint radeon_previous_color[] =
{
   RADEON_COLOR_ARG_A_CURRENT_COLOR,
   RADEON_COLOR_ARG_A_CURRENT_COLOR | RADEON_COMP_ARG_A,
   RADEON_COLOR_ARG_A_CURRENT_ALPHA,
   RADEON_COLOR_ARG_A_CURRENT_ALPHA | RADEON_COMP_ARG_A
};

/* GL_ZERO table - indices 0-3
 * GL_ONE  table - indices 1-4
 */
static GLuint radeon_zero_color[] =
{
   RADEON_COLOR_ARG_A_ZERO,
   RADEON_COLOR_ARG_A_ZERO | RADEON_COMP_ARG_A,
   RADEON_COLOR_ARG_A_ZERO,
   RADEON_COLOR_ARG_A_ZERO | RADEON_COMP_ARG_A,
   RADEON_COLOR_ARG_A_ZERO
};


/* The alpha tables only have GL_SRC_ALPHA and GL_ONE_MINUS_SRC_ALPHA.
 */
static GLuint radeon_texture_alpha[][RADEON_MAX_TEXTURE_UNITS] =
{
   {
      RADEON_ALPHA_ARG_A_T0_ALPHA,
      RADEON_ALPHA_ARG_A_T1_ALPHA,
      RADEON_ALPHA_ARG_A_T2_ALPHA
   },
   {
      RADEON_ALPHA_ARG_A_T0_ALPHA | RADEON_COMP_ARG_A,
      RADEON_ALPHA_ARG_A_T1_ALPHA | RADEON_COMP_ARG_A,
      RADEON_ALPHA_ARG_A_T2_ALPHA | RADEON_COMP_ARG_A
   },
};

static GLuint radeon_tfactor_alpha[] =
{
   RADEON_ALPHA_ARG_A_TFACTOR_ALPHA,
   RADEON_ALPHA_ARG_A_TFACTOR_ALPHA | RADEON_COMP_ARG_A
};

static GLuint radeon_primary_alpha[] =
{
   RADEON_ALPHA_ARG_A_DIFFUSE_ALPHA,
   RADEON_ALPHA_ARG_A_DIFFUSE_ALPHA | RADEON_COMP_ARG_A
};

static GLuint radeon_previous_alpha[] =
{
   RADEON_ALPHA_ARG_A_CURRENT_ALPHA,
   RADEON_ALPHA_ARG_A_CURRENT_ALPHA | RADEON_COMP_ARG_A
};

/* GL_ZERO table - indices 0-1
 * GL_ONE  table - indices 1-2
 */
static GLuint radeon_zero_alpha[] =
{
   RADEON_ALPHA_ARG_A_ZERO,
   RADEON_ALPHA_ARG_A_ZERO | RADEON_COMP_ARG_A,
   RADEON_ALPHA_ARG_A_ZERO
};


/* Extract the arg from slot A, shift it into the correct argument slot
 * and set the corresponding complement bit.
 */
#define RADEON_COLOR_ARG( n, arg )                      \
do {                                                    \
   color_combine |=                                     \
      ((color_arg[n] & RADEON_COLOR_ARG_MASK)           \
       << RADEON_COLOR_ARG_##arg##_SHIFT);              \
   color_combine |=                                     \
      ((color_arg[n] >> RADEON_COMP_ARG_SHIFT)          \
       << RADEON_COMP_ARG_##arg##_SHIFT);               \
} while (0)

#define RADEON_ALPHA_ARG( n, arg )                      \
do {                                                    \
   alpha_combine |=                                     \
      ((alpha_arg[n] & RADEON_ALPHA_ARG_MASK)           \
       << RADEON_ALPHA_ARG_##arg##_SHIFT);              \
   alpha_combine |=                                     \
      ((alpha_arg[n] >> RADEON_COMP_ARG_SHIFT)          \
       << RADEON_COMP_ARG_##arg##_SHIFT);               \
} while (0)


/* ================================================================
 * Texture unit state management
 */

static GLboolean radeonUpdateTextureEnv( struct gl_context *ctx, int unit )
{
   r100ContextPtr rmesa = R100_CONTEXT(ctx);
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
   GLuint color_combine, alpha_combine;
   const GLuint color_combine0 = RADEON_COLOR_ARG_A_ZERO | RADEON_COLOR_ARG_B_ZERO
         | RADEON_COLOR_ARG_C_CURRENT_COLOR | RADEON_BLEND_CTL_ADD
         | RADEON_SCALE_1X | RADEON_CLAMP_TX;
   const GLuint alpha_combine0 = RADEON_ALPHA_ARG_A_ZERO | RADEON_ALPHA_ARG_B_ZERO
         | RADEON_ALPHA_ARG_C_CURRENT_ALPHA | RADEON_BLEND_CTL_ADD
         | RADEON_SCALE_1X | RADEON_CLAMP_TX;


   /* texUnit->_Current can be NULL if and only if the texture unit is
    * not actually enabled.
    */
   assert( (texUnit->_ReallyEnabled == 0)
           || (texUnit->_Current != NULL) );

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

   /* Set the texture environment state.  Isn't this nice and clean?
    * The chip will automagically set the texture alpha to 0xff when
    * the texture format does not include an alpha component. This
    * reduces the amount of special-casing we have to do, alpha-only
    * textures being a notable exception. Doesn't work for luminance
    * textures realized with I8 and ALPHA_IN_MAP not set neither (on r100).
    */
    /* Don't cache these results.
    */
   rmesa->state.texture.unit[unit].format = 0;
   rmesa->state.texture.unit[unit].envMode = 0;

   if ( !texUnit->_ReallyEnabled ) {
      color_combine = color_combine0;
      alpha_combine = alpha_combine0;
   }
   else {
      GLuint color_arg[3], alpha_arg[3];
      GLuint i;
      const GLuint numColorArgs = texUnit->_CurrentCombine->_NumArgsRGB;
      const GLuint numAlphaArgs = texUnit->_CurrentCombine->_NumArgsA;
      GLuint RGBshift = texUnit->_CurrentCombine->ScaleShiftRGB;
      GLuint Ashift = texUnit->_CurrentCombine->ScaleShiftA;


      /* Step 1:
       * Extract the color and alpha combine function arguments.
       */
      for ( i = 0 ; i < numColorArgs ; i++ ) {
         const GLint op = texUnit->_CurrentCombine->OperandRGB[i] - GL_SRC_COLOR;
         const GLuint srcRGBi = texUnit->_CurrentCombine->SourceRGB[i];
         assert(op >= 0);
         assert(op <= 3);
         switch ( srcRGBi ) {
         case GL_TEXTURE:
            if (texUnit->_Current->Image[0][0]->_BaseFormat == GL_ALPHA)
               color_arg[i] = radeon_zero_color[op];
            else
               color_arg[i] = radeon_texture_color[op][unit];
            break;
         case GL_CONSTANT:
            color_arg[i] = radeon_tfactor_color[op];
            break;
         case GL_PRIMARY_COLOR:
            color_arg[i] = radeon_primary_color[op];
            break;
         case GL_PREVIOUS:
            color_arg[i] = radeon_previous_color[op];
            break;
         case GL_ZERO:
            color_arg[i] = radeon_zero_color[op];
            break;
         case GL_ONE:
            color_arg[i] = radeon_zero_color[op+1];
            break;
         case GL_TEXTURE0:
         case GL_TEXTURE1:
         case GL_TEXTURE2: {
            GLuint txunit = srcRGBi - GL_TEXTURE0;
            if (ctx->Texture.Unit[txunit]._Current->Image[0][0]->_BaseFormat == GL_ALPHA)
               color_arg[i] = radeon_zero_color[op];
            else
         /* implement ogl 1.4/1.5 core spec here, not specification of
          * GL_ARB_texture_env_crossbar (which would require disabling blending
          * instead of undefined results when referencing not enabled texunit) */
              color_arg[i] = radeon_texture_color[op][txunit];
            }
            break;
         default:
            return GL_FALSE;
         }
      }

      for ( i = 0 ; i < numAlphaArgs ; i++ ) {
         const GLint op = texUnit->_CurrentCombine->OperandA[i] - GL_SRC_ALPHA;
         const GLuint srcAi = texUnit->_CurrentCombine->SourceA[i];
         assert(op >= 0);
         assert(op <= 1);
         switch ( srcAi ) {
         case GL_TEXTURE:
            if (texUnit->_Current->Image[0][0]->_BaseFormat == GL_LUMINANCE)
               alpha_arg[i] = radeon_zero_alpha[op+1];
            else
               alpha_arg[i] = radeon_texture_alpha[op][unit];
            break;
         case GL_CONSTANT:
            alpha_arg[i] = radeon_tfactor_alpha[op];
            break;
         case GL_PRIMARY_COLOR:
            alpha_arg[i] = radeon_primary_alpha[op];
            break;
         case GL_PREVIOUS:
            alpha_arg[i] = radeon_previous_alpha[op];
            break;
         case GL_ZERO:
            alpha_arg[i] = radeon_zero_alpha[op];
            break;
         case GL_ONE:
            alpha_arg[i] = radeon_zero_alpha[op+1];
            break;
         case GL_TEXTURE0:
         case GL_TEXTURE1:
         case GL_TEXTURE2: {    
            GLuint txunit = srcAi - GL_TEXTURE0;
            if (ctx->Texture.Unit[txunit]._Current->Image[0][0]->_BaseFormat == GL_LUMINANCE)
               alpha_arg[i] = radeon_zero_alpha[op+1];
            else
               alpha_arg[i] = radeon_texture_alpha[op][txunit];
            }
            break;
         default:
            return GL_FALSE;
         }
      }

      /* Step 2:
       * Build up the color and alpha combine functions.
       */
      switch ( texUnit->_CurrentCombine->ModeRGB ) {
      case GL_REPLACE:
         color_combine = (RADEON_COLOR_ARG_A_ZERO |
                          RADEON_COLOR_ARG_B_ZERO |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, C );
         break;
      case GL_MODULATE:
         color_combine = (RADEON_COLOR_ARG_C_ZERO |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, B );
         break;
      case GL_ADD:
         color_combine = (RADEON_COLOR_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         break;
      case GL_ADD_SIGNED:
         color_combine = (RADEON_COLOR_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_ADDSIGNED |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         break;
      case GL_SUBTRACT:
         color_combine = (RADEON_COLOR_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_SUBTRACT |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         break;
      case GL_INTERPOLATE:
         color_combine = (RADEON_BLEND_CTL_BLEND |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, B );
         RADEON_COLOR_ARG( 1, A );
         RADEON_COLOR_ARG( 2, C );
         break;

      case GL_DOT3_RGB_EXT:
      case GL_DOT3_RGBA_EXT:
         /* The EXT version of the DOT3 extension does not support the
          * scale factor, but the ARB version (and the version in OpenGL
          * 1.3) does.
          */
         RGBshift = 0;
         /* FALLTHROUGH */

      case GL_DOT3_RGB:
      case GL_DOT3_RGBA:
         /* The R100 / RV200 only support a 1X multiplier in hardware
          * w/the ARB version.
          */
         if ( RGBshift != (RADEON_SCALE_1X >> RADEON_SCALE_SHIFT) ) {
            return GL_FALSE;
         }

         RGBshift += 2;
         if ( (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT)
            || (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) ) {
            /* is it necessary to set this or will it be ignored anyway? */
            Ashift = RGBshift;
         }

         color_combine = (RADEON_COLOR_ARG_C_ZERO |
                          RADEON_BLEND_CTL_DOT3 |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, B );
         break;

      case GL_MODULATE_ADD_ATI:
         color_combine = (RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         RADEON_COLOR_ARG( 2, B );
         break;
      case GL_MODULATE_SIGNED_ADD_ATI:
         color_combine = (RADEON_BLEND_CTL_ADDSIGNED |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         RADEON_COLOR_ARG( 2, B );
         break;
      case GL_MODULATE_SUBTRACT_ATI:
         color_combine = (RADEON_BLEND_CTL_SUBTRACT |
                          RADEON_CLAMP_TX);
         RADEON_COLOR_ARG( 0, A );
         RADEON_COLOR_ARG( 1, C );
         RADEON_COLOR_ARG( 2, B );
         break;
      default:
         return GL_FALSE;
      }

      switch ( texUnit->_CurrentCombine->ModeA ) {
      case GL_REPLACE:
         alpha_combine = (RADEON_ALPHA_ARG_A_ZERO |
                          RADEON_ALPHA_ARG_B_ZERO |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, C );
         break;
      case GL_MODULATE:
         alpha_combine = (RADEON_ALPHA_ARG_C_ZERO |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, B );
         break;
      case GL_ADD:
         alpha_combine = (RADEON_ALPHA_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         break;
      case GL_ADD_SIGNED:
         alpha_combine = (RADEON_ALPHA_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_ADDSIGNED |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         break;
      case GL_SUBTRACT:
         alpha_combine = (RADEON_COLOR_ARG_B_ZERO |
                          RADEON_COMP_ARG_B |
                          RADEON_BLEND_CTL_SUBTRACT |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         break;
      case GL_INTERPOLATE:
         alpha_combine = (RADEON_BLEND_CTL_BLEND |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, B );
         RADEON_ALPHA_ARG( 1, A );
         RADEON_ALPHA_ARG( 2, C );
         break;

      case GL_MODULATE_ADD_ATI:
         alpha_combine = (RADEON_BLEND_CTL_ADD |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         RADEON_ALPHA_ARG( 2, B );
         break;
      case GL_MODULATE_SIGNED_ADD_ATI:
         alpha_combine = (RADEON_BLEND_CTL_ADDSIGNED |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         RADEON_ALPHA_ARG( 2, B );
         break;
      case GL_MODULATE_SUBTRACT_ATI:
         alpha_combine = (RADEON_BLEND_CTL_SUBTRACT |
                          RADEON_CLAMP_TX);
         RADEON_ALPHA_ARG( 0, A );
         RADEON_ALPHA_ARG( 1, C );
         RADEON_ALPHA_ARG( 2, B );
         break;
      default:
         return GL_FALSE;
      }

      if ( (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGB_EXT)
           || (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGB) ) {
         alpha_combine |= RADEON_DOT_ALPHA_DONT_REPLICATE;
      }

      /* Step 3:
       * Apply the scale factor.
       */
      color_combine |= (RGBshift << RADEON_SCALE_SHIFT);
      alpha_combine |= (Ashift   << RADEON_SCALE_SHIFT);

      /* All done!
       */
   }

   if ( rmesa->hw.tex[unit].cmd[TEX_PP_TXCBLEND] != color_combine ||
        rmesa->hw.tex[unit].cmd[TEX_PP_TXABLEND] != alpha_combine ) {
      RADEON_STATECHANGE( rmesa, tex[unit] );
      rmesa->hw.tex[unit].cmd[TEX_PP_TXCBLEND] = color_combine;
      rmesa->hw.tex[unit].cmd[TEX_PP_TXABLEND] = alpha_combine;
   }

   return GL_TRUE;
}

void radeonSetTexBuffer2(__DRIcontext *pDRICtx, GLint target, GLint texture_format,
                         __DRIdrawable *dPriv)
{
        struct gl_texture_unit *texUnit;
        struct gl_texture_object *texObj;
        struct gl_texture_image *texImage;
        struct radeon_renderbuffer *rb;
        radeon_texture_image *rImage;
        radeonContextPtr radeon;
        struct radeon_framebuffer *rfb;
        radeonTexObjPtr t;
        uint32_t pitch_val;
        gl_format texFormat;

        radeon = pDRICtx->driverPrivate;

        rfb = dPriv->driverPrivate;
        texUnit = _mesa_get_current_tex_unit(radeon->glCtx);
        texObj = _mesa_select_tex_object(radeon->glCtx, texUnit, target);
        texImage = _mesa_get_tex_image(radeon->glCtx, texObj, target, 0);

        rImage = get_radeon_texture_image(texImage);
        t = radeon_tex_obj(texObj);
        if (t == NULL) {
            return;
        }

        radeon_update_renderbuffers(pDRICtx, dPriv, GL_TRUE);
        rb = rfb->color_rb[0];
        if (rb->bo == NULL) {
                /* Failed to BO for the buffer */
                return;
        }

        _mesa_lock_texture(radeon->glCtx, texObj);
        if (t->bo) {
                radeon_bo_unref(t->bo);
                t->bo = NULL;
        }
        if (rImage->bo) {
                radeon_bo_unref(rImage->bo);
                rImage->bo = NULL;
        }

        radeon_miptree_unreference(&t->mt);
        radeon_miptree_unreference(&rImage->mt);

        rImage->bo = rb->bo;
        radeon_bo_ref(rImage->bo);
        t->bo = rb->bo;
        radeon_bo_ref(t->bo);
        t->tile_bits = 0;
        t->image_override = GL_TRUE;
        t->override_offset = 0;
        switch (rb->cpp) {
        case 4:
                if (texture_format == __DRI_TEXTURE_FORMAT_RGB) {
                        t->pp_txformat = tx_table[MESA_FORMAT_RGB888].format;
                        texFormat = MESA_FORMAT_RGB888;
                }
                else {
                        t->pp_txformat = tx_table[MESA_FORMAT_ARGB8888].format;
                        texFormat = MESA_FORMAT_ARGB8888;
                }
                t->pp_txfilter |= tx_table[MESA_FORMAT_ARGB8888].filter;
                break;
        case 3:
        default:
                texFormat = MESA_FORMAT_RGB888;
                t->pp_txformat = tx_table[MESA_FORMAT_RGB888].format;
                t->pp_txfilter |= tx_table[MESA_FORMAT_RGB888].filter;
                break;
        case 2:
                texFormat = MESA_FORMAT_RGB565;
                t->pp_txformat = tx_table[MESA_FORMAT_RGB565].format;
                t->pp_txfilter |= tx_table[MESA_FORMAT_RGB565].filter;
                break;
        }

        _mesa_init_teximage_fields(radeon->glCtx, texImage,
                                   rb->base.Base.Width, rb->base.Base.Height,
                                   1, 0,
                                   rb->cpp, texFormat);
        rImage->base.RowStride = rb->pitch / rb->cpp;

        t->pp_txpitch &= (1 << 13) -1;
        pitch_val = rb->pitch;

        t->pp_txsize = ((rb->base.Base.Width - 1) << RADEON_TEX_USIZE_SHIFT)
                | ((rb->base.Base.Height - 1) << RADEON_TEX_VSIZE_SHIFT);
        if (target == GL_TEXTURE_RECTANGLE_NV) {
                t->pp_txformat |= RADEON_TXFORMAT_NON_POWER2;
                t->pp_txpitch = pitch_val;
                t->pp_txpitch -= 32;
        } else {
          t->pp_txformat &= ~(RADEON_TXFORMAT_WIDTH_MASK |
                              RADEON_TXFORMAT_HEIGHT_MASK |
                              RADEON_TXFORMAT_CUBIC_MAP_ENABLE |
                              RADEON_TXFORMAT_F5_WIDTH_MASK |
                              RADEON_TXFORMAT_F5_HEIGHT_MASK);
          t->pp_txformat |= ((texImage->WidthLog2 << RADEON_TXFORMAT_WIDTH_SHIFT) |
                             (texImage->HeightLog2 << RADEON_TXFORMAT_HEIGHT_SHIFT));
        }
        t->validated = GL_TRUE;
        _mesa_unlock_texture(radeon->glCtx, texObj);
        return;
}


void radeonSetTexBuffer(__DRIcontext *pDRICtx, GLint target, __DRIdrawable *dPriv)
{
        radeonSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
}


#define TEXOBJ_TXFILTER_MASK (RADEON_MAX_MIP_LEVEL_MASK |       \
                              RADEON_MIN_FILTER_MASK |          \
                              RADEON_MAG_FILTER_MASK |          \
                              RADEON_MAX_ANISO_MASK |           \
                              RADEON_YUV_TO_RGB |               \
                              RADEON_YUV_TEMPERATURE_MASK |     \
                              RADEON_CLAMP_S_MASK |             \
                              RADEON_CLAMP_T_MASK |             \
                              RADEON_BORDER_MODE_D3D )

#define TEXOBJ_TXFORMAT_MASK (RADEON_TXFORMAT_WIDTH_MASK |      \
                              RADEON_TXFORMAT_HEIGHT_MASK |     \
                              RADEON_TXFORMAT_FORMAT_MASK |     \
                              RADEON_TXFORMAT_F5_WIDTH_MASK |   \
                              RADEON_TXFORMAT_F5_HEIGHT_MASK |  \
                              RADEON_TXFORMAT_ALPHA_IN_MAP |    \
                              RADEON_TXFORMAT_CUBIC_MAP_ENABLE |        \
                              RADEON_TXFORMAT_NON_POWER2)


static void disable_tex_obj_state( r100ContextPtr rmesa, 
                                   int unit )
{
   RADEON_STATECHANGE( rmesa, tex[unit] );

   RADEON_STATECHANGE( rmesa, tcl );
   rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] &= ~(RADEON_ST_BIT(unit) |
                                             RADEON_Q_BIT(unit));
   
   if (rmesa->radeon.TclFallback & (RADEON_TCL_FALLBACK_TEXGEN_0<<unit)) {
     TCL_FALLBACK( rmesa->radeon.glCtx, (RADEON_TCL_FALLBACK_TEXGEN_0<<unit), GL_FALSE);
     rmesa->recheck_texgen[unit] = GL_TRUE;
   }

   if (rmesa->hw.tex[unit].cmd[TEX_PP_TXFORMAT] & RADEON_TXFORMAT_CUBIC_MAP_ENABLE) {
     /* this seems to be a genuine (r100 only?) hw bug. Need to remove the
        cubic_map bit on unit 2 when the unit is disabled, otherwise every
        2nd (2d) mipmap on unit 0 will be broken (may not be needed for other
        units, better be safe than sorry though).*/
     RADEON_STATECHANGE( rmesa, tex[unit] );
     rmesa->hw.tex[unit].cmd[TEX_PP_TXFORMAT] &= ~RADEON_TXFORMAT_CUBIC_MAP_ENABLE;
   }

   {
      GLuint inputshift = RADEON_TEXGEN_0_INPUT_SHIFT + unit*4;
      GLuint tmp = rmesa->TexGenEnabled;

      rmesa->TexGenEnabled &= ~(RADEON_TEXGEN_TEXMAT_0_ENABLE<<unit);
      rmesa->TexGenEnabled &= ~(RADEON_TEXMAT_0_ENABLE<<unit);
      rmesa->TexGenEnabled &= ~(RADEON_TEXGEN_INPUT_MASK<<inputshift);
      rmesa->TexGenNeedNormals[unit] = 0;
      rmesa->TexGenEnabled |= 
        (RADEON_TEXGEN_INPUT_TEXCOORD_0+unit) << inputshift;

      if (tmp != rmesa->TexGenEnabled) {
        rmesa->recheck_texgen[unit] = GL_TRUE;
        rmesa->radeon.NewGLState |= _NEW_TEXTURE_MATRIX;
      }
   }
}

static void import_tex_obj_state( r100ContextPtr rmesa,
                                  int unit,
                                  radeonTexObjPtr texobj )
{
/* do not use RADEON_DB_STATE to avoid stale texture caches */
   uint32_t *cmd = &rmesa->hw.tex[unit].cmd[TEX_CMD_0];
   GLuint se_coord_fmt = rmesa->hw.set.cmd[SET_SE_COORDFMT];

   RADEON_STATECHANGE( rmesa, tex[unit] );

   cmd[TEX_PP_TXFILTER] &= ~TEXOBJ_TXFILTER_MASK;
   cmd[TEX_PP_TXFILTER] |= texobj->pp_txfilter & TEXOBJ_TXFILTER_MASK;
   cmd[TEX_PP_TXFORMAT] &= ~TEXOBJ_TXFORMAT_MASK;
   cmd[TEX_PP_TXFORMAT] |= texobj->pp_txformat & TEXOBJ_TXFORMAT_MASK;
   cmd[TEX_PP_BORDER_COLOR] = texobj->pp_border_color;

   if (texobj->pp_txformat & RADEON_TXFORMAT_NON_POWER2) {
      uint32_t *txr_cmd = &rmesa->hw.txr[unit].cmd[TXR_CMD_0];
      txr_cmd[TXR_PP_TEX_SIZE] = texobj->pp_txsize; /* NPOT only! */
      txr_cmd[TXR_PP_TEX_PITCH] = texobj->pp_txpitch; /* NPOT only! */
      RADEON_STATECHANGE( rmesa, txr[unit] );
   }

   if (texobj->base.Target == GL_TEXTURE_RECTANGLE_NV) {
      se_coord_fmt |= RADEON_VTX_ST0_NONPARAMETRIC << unit;
   }
   else {
      se_coord_fmt &= ~(RADEON_VTX_ST0_NONPARAMETRIC << unit);

      if (texobj->base.Target == GL_TEXTURE_CUBE_MAP) {
         uint32_t *cube_cmd = &rmesa->hw.cube[unit].cmd[CUBE_CMD_0];

         RADEON_STATECHANGE( rmesa, cube[unit] );
         cube_cmd[CUBE_PP_CUBIC_FACES] = texobj->pp_cubic_faces;
         /* state filled out in the cube_emit */
      }
   }

   if (se_coord_fmt != rmesa->hw.set.cmd[SET_SE_COORDFMT]) {
      RADEON_STATECHANGE( rmesa, set );
      rmesa->hw.set.cmd[SET_SE_COORDFMT] = se_coord_fmt;
   }

   rmesa->radeon.NewGLState |= _NEW_TEXTURE_MATRIX;
}


static void set_texgen_matrix( r100ContextPtr rmesa, 
                               GLuint unit,
                               const GLfloat *s_plane,
                               const GLfloat *t_plane,
                               const GLfloat *r_plane,
                               const GLfloat *q_plane )
{
   rmesa->TexGenMatrix[unit].m[0]  = s_plane[0];
   rmesa->TexGenMatrix[unit].m[4]  = s_plane[1];
   rmesa->TexGenMatrix[unit].m[8]  = s_plane[2];
   rmesa->TexGenMatrix[unit].m[12] = s_plane[3];

   rmesa->TexGenMatrix[unit].m[1]  = t_plane[0];
   rmesa->TexGenMatrix[unit].m[5]  = t_plane[1];
   rmesa->TexGenMatrix[unit].m[9]  = t_plane[2];
   rmesa->TexGenMatrix[unit].m[13] = t_plane[3];

   rmesa->TexGenMatrix[unit].m[2]  = r_plane[0];
   rmesa->TexGenMatrix[unit].m[6]  = r_plane[1];
   rmesa->TexGenMatrix[unit].m[10] = r_plane[2];
   rmesa->TexGenMatrix[unit].m[14] = r_plane[3];

   rmesa->TexGenMatrix[unit].m[3]  = q_plane[0];
   rmesa->TexGenMatrix[unit].m[7]  = q_plane[1];
   rmesa->TexGenMatrix[unit].m[11] = q_plane[2];
   rmesa->TexGenMatrix[unit].m[15] = q_plane[3];

   rmesa->TexGenEnabled |= RADEON_TEXMAT_0_ENABLE << unit;
   rmesa->radeon.NewGLState |= _NEW_TEXTURE_MATRIX;
}

/* Returns GL_FALSE if fallback required.
 */
static GLboolean radeon_validate_texgen( struct gl_context *ctx, GLuint unit )
{
   r100ContextPtr rmesa = R100_CONTEXT(ctx);
   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
   GLuint inputshift = RADEON_TEXGEN_0_INPUT_SHIFT + unit*4;
   GLuint tmp = rmesa->TexGenEnabled;
   static const GLfloat reflect[16] = {
      -1,  0,  0,  0,
       0, -1,  0,  0,
       0,  0,  -1, 0,
       0,  0,  0,  1 };

   rmesa->TexGenEnabled &= ~(RADEON_TEXGEN_TEXMAT_0_ENABLE << unit);
   rmesa->TexGenEnabled &= ~(RADEON_TEXMAT_0_ENABLE << unit);
   rmesa->TexGenEnabled &= ~(RADEON_TEXGEN_INPUT_MASK << inputshift);
   rmesa->TexGenNeedNormals[unit] = 0;

   if ((texUnit->TexGenEnabled & (S_BIT|T_BIT|R_BIT|Q_BIT)) == 0) {
      /* Disabled, no fallback:
       */
      rmesa->TexGenEnabled |=
         (RADEON_TEXGEN_INPUT_TEXCOORD_0 + unit) << inputshift;
      return GL_TRUE;
   }
   /* the r100 cannot do texgen for some coords and not for others
    * we do not detect such cases (certainly can't do it here) and just
    * ASSUME that when S and T are texgen enabled we do not need other
    * non-texgen enabled coords, no matter if the R and Q bits are texgen
    * enabled. Still check for mixed mode texgen for all coords.
    */
   else if ( (texUnit->TexGenEnabled & S_BIT) &&
             (texUnit->TexGenEnabled & T_BIT) &&
             (texUnit->GenS.Mode == texUnit->GenT.Mode) ) {
      if ( ((texUnit->TexGenEnabled & R_BIT) &&
            (texUnit->GenS.Mode != texUnit->GenR.Mode)) ||
           ((texUnit->TexGenEnabled & Q_BIT) &&
            (texUnit->GenS.Mode != texUnit->GenQ.Mode)) ) {
         /* Mixed modes, fallback:
          */
         if (RADEON_DEBUG & RADEON_FALLBACKS)
            fprintf(stderr, "fallback mixed texgen\n");
         return GL_FALSE;
      }
      rmesa->TexGenEnabled |= RADEON_TEXGEN_TEXMAT_0_ENABLE << unit;
   }
   else {
   /* some texgen mode not including both S and T bits */
      if (RADEON_DEBUG & RADEON_FALLBACKS)
         fprintf(stderr, "fallback mixed texgen/nontexgen\n");
      return GL_FALSE;
   }

   if ((texUnit->TexGenEnabled & (R_BIT | Q_BIT)) != 0) {
      /* need this here for vtxfmt presumably. Argh we need to set
         this from way too many places, would be much easier if we could leave
         tcl q coord always enabled as on r200) */
      RADEON_STATECHANGE( rmesa, tcl );
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_Q_BIT(unit);
   }

   switch (texUnit->GenS.Mode) {
   case GL_OBJECT_LINEAR:
      rmesa->TexGenEnabled |= RADEON_TEXGEN_INPUT_OBJ << inputshift;
      set_texgen_matrix( rmesa, unit,
                         texUnit->GenS.ObjectPlane,
                         texUnit->GenT.ObjectPlane,
                         texUnit->GenR.ObjectPlane,
                         texUnit->GenQ.ObjectPlane);
      break;

   case GL_EYE_LINEAR:
      rmesa->TexGenEnabled |= RADEON_TEXGEN_INPUT_EYE << inputshift;
      set_texgen_matrix( rmesa, unit,
                         texUnit->GenS.EyePlane,
                         texUnit->GenT.EyePlane,
                         texUnit->GenR.EyePlane,
                         texUnit->GenQ.EyePlane);
      break;

   case GL_REFLECTION_MAP_NV:
      rmesa->TexGenNeedNormals[unit] = GL_TRUE;
      rmesa->TexGenEnabled |= RADEON_TEXGEN_INPUT_EYE_REFLECT << inputshift;
      /* TODO: unknown if this is needed/correct */
      set_texgen_matrix( rmesa, unit, reflect, reflect + 4,
                        reflect + 8, reflect + 12 );
      break;

   case GL_NORMAL_MAP_NV:
      rmesa->TexGenNeedNormals[unit] = GL_TRUE;
      rmesa->TexGenEnabled |= RADEON_TEXGEN_INPUT_EYE_NORMAL << inputshift;
      break;

   case GL_SPHERE_MAP:
      /* the mode which everyone uses :-( */
   default:
      /* Unsupported mode, fallback:
       */
      if (RADEON_DEBUG & RADEON_FALLBACKS)
         fprintf(stderr, "fallback GL_SPHERE_MAP\n");
      return GL_FALSE;
   }

   if (tmp != rmesa->TexGenEnabled) {
      rmesa->radeon.NewGLState |= _NEW_TEXTURE_MATRIX;
   }

   return GL_TRUE;
}

/**
 * Compute the cached hardware register values for the given texture object.
 *
 * \param rmesa Context pointer
 * \param t the r300 texture object
 */
static GLboolean setup_hardware_state(r100ContextPtr rmesa, radeonTexObj *t, int unit)
{
   const struct gl_texture_image *firstImage;
   GLint log2Width, log2Height, texelBytes;

   if ( t->bo ) {
        return GL_TRUE;
   }

   firstImage = t->base.Image[0][t->minLod];

   log2Width  = firstImage->WidthLog2;
   log2Height = firstImage->HeightLog2;
   texelBytes = _mesa_get_format_bytes(firstImage->TexFormat);

   if (!t->image_override) {
      if (VALID_FORMAT(firstImage->TexFormat)) {
        const struct tx_table *table = tx_table;

         t->pp_txformat &= ~(RADEON_TXFORMAT_FORMAT_MASK |
                             RADEON_TXFORMAT_ALPHA_IN_MAP);
         t->pp_txfilter &= ~RADEON_YUV_TO_RGB;   
         
         t->pp_txformat |= table[ firstImage->TexFormat ].format;
         t->pp_txfilter |= table[ firstImage->TexFormat ].filter;
      } else {
         _mesa_problem(NULL, "unexpected texture format in %s",
                       __FUNCTION__);
         return GL_FALSE;
      }
   }

   t->pp_txfilter &= ~RADEON_MAX_MIP_LEVEL_MASK;
   t->pp_txfilter |= (t->maxLod - t->minLod) << RADEON_MAX_MIP_LEVEL_SHIFT;
        
   t->pp_txformat &= ~(RADEON_TXFORMAT_WIDTH_MASK |
                       RADEON_TXFORMAT_HEIGHT_MASK |
                       RADEON_TXFORMAT_CUBIC_MAP_ENABLE |
                       RADEON_TXFORMAT_F5_WIDTH_MASK |
                       RADEON_TXFORMAT_F5_HEIGHT_MASK);
   t->pp_txformat |= ((log2Width << RADEON_TXFORMAT_WIDTH_SHIFT) |
                      (log2Height << RADEON_TXFORMAT_HEIGHT_SHIFT));

   t->tile_bits = 0;

   if (t->base.Target == GL_TEXTURE_CUBE_MAP) {
      ASSERT(log2Width == log2Height);
      t->pp_txformat |= ((log2Width << RADEON_TXFORMAT_F5_WIDTH_SHIFT) |
                         (log2Height << RADEON_TXFORMAT_F5_HEIGHT_SHIFT) |
                         /* don't think we need this bit, if it exists at all - fglrx does not set it */
                         (RADEON_TXFORMAT_CUBIC_MAP_ENABLE));
      t->pp_cubic_faces = ((log2Width << RADEON_FACE_WIDTH_1_SHIFT) |
                           (log2Height << RADEON_FACE_HEIGHT_1_SHIFT) |
                           (log2Width << RADEON_FACE_WIDTH_2_SHIFT) |
                           (log2Height << RADEON_FACE_HEIGHT_2_SHIFT) |
                           (log2Width << RADEON_FACE_WIDTH_3_SHIFT) |
                           (log2Height << RADEON_FACE_HEIGHT_3_SHIFT) |
                           (log2Width << RADEON_FACE_WIDTH_4_SHIFT) |
                           (log2Height << RADEON_FACE_HEIGHT_4_SHIFT));
   }

   t->pp_txsize = (((firstImage->Width - 1) << RADEON_TEX_USIZE_SHIFT)
                   | ((firstImage->Height - 1) << RADEON_TEX_VSIZE_SHIFT));

   if ( !t->image_override ) {
      if (_mesa_is_format_compressed(firstImage->TexFormat))
         t->pp_txpitch = (firstImage->Width + 63) & ~(63);
      else
         t->pp_txpitch = ((firstImage->Width * texelBytes) + 63) & ~(63);
      t->pp_txpitch -= 32;
   }

   if (t->base.Target == GL_TEXTURE_RECTANGLE_NV) {
      t->pp_txformat |= RADEON_TXFORMAT_NON_POWER2;
   }

   return GL_TRUE;
}

static GLboolean radeon_validate_texture(struct gl_context *ctx, struct gl_texture_object *texObj, int unit)
{
   r100ContextPtr rmesa = R100_CONTEXT(ctx);
   radeonTexObj *t = radeon_tex_obj(texObj);
   int ret;

   if (!radeon_validate_texture_miptree(ctx, texObj))
      return GL_FALSE;

   ret = setup_hardware_state(rmesa, t, unit);
   if (ret == GL_FALSE)
     return GL_FALSE;

   /* yuv conversion only works in first unit */
   if (unit != 0 && (t->pp_txfilter & RADEON_YUV_TO_RGB))
      return GL_FALSE;

   RADEON_STATECHANGE( rmesa, ctx );
   rmesa->hw.ctx.cmd[CTX_PP_CNTL] |= 
     (RADEON_TEX_0_ENABLE | RADEON_TEX_BLEND_0_ENABLE) << unit;
   RADEON_STATECHANGE( rmesa, tcl );
   rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_ST_BIT(unit);

   rmesa->recheck_texgen[unit] = GL_TRUE;

   import_tex_obj_state( rmesa, unit, t );

   if (rmesa->recheck_texgen[unit]) {
      GLboolean fallback = !radeon_validate_texgen( ctx, unit );
      TCL_FALLBACK( ctx, (RADEON_TCL_FALLBACK_TEXGEN_0<<unit), fallback);
      rmesa->recheck_texgen[unit] = 0;
      rmesa->radeon.NewGLState |= _NEW_TEXTURE_MATRIX;
   }

   if ( ! radeonUpdateTextureEnv( ctx, unit ) ) {
     return GL_FALSE;
   }
   FALLBACK( rmesa, RADEON_FALLBACK_BORDER_MODE, t->border_fallback );

   t->validated = GL_TRUE;
   return !t->border_fallback;
}

static GLboolean radeonUpdateTextureUnit( struct gl_context *ctx, int unit )
{
   r100ContextPtr rmesa = R100_CONTEXT(ctx);

   if (ctx->Texture.Unit[unit]._ReallyEnabled & TEXTURE_3D_BIT) {
     disable_tex_obj_state(rmesa, unit);
     rmesa->state.texture.unit[unit].texobj = NULL;
     return GL_FALSE;
   }

   if (!ctx->Texture.Unit[unit]._ReallyEnabled) {
     /* disable the unit */
     disable_tex_obj_state(rmesa, unit);
     rmesa->state.texture.unit[unit].texobj = NULL;
     return GL_TRUE;
   }

   if (!radeon_validate_texture(ctx, ctx->Texture.Unit[unit]._Current, unit)) {
    _mesa_warning(ctx,
                  "failed to validate texture for unit %d.\n",
                  unit);
     rmesa->state.texture.unit[unit].texobj = NULL;
     return GL_FALSE;
   }
   rmesa->state.texture.unit[unit].texobj = radeon_tex_obj(ctx->Texture.Unit[unit]._Current);
   return GL_TRUE;
}

void radeonUpdateTextureState( struct gl_context *ctx )
{
   r100ContextPtr rmesa = R100_CONTEXT(ctx);
   GLboolean ok;

   /* set the ctx all textures off */
   RADEON_STATECHANGE( rmesa, ctx );
   rmesa->hw.ctx.cmd[CTX_PP_CNTL] &= ~((RADEON_TEX_ENABLE_MASK) | (RADEON_TEX_BLEND_ENABLE_MASK));

   ok = (radeonUpdateTextureUnit( ctx, 0 ) &&
         radeonUpdateTextureUnit( ctx, 1 ) &&
         radeonUpdateTextureUnit( ctx, 2 ));

   FALLBACK( rmesa, RADEON_FALLBACK_TEXTURE, !ok );

   if (rmesa->radeon.TclFallback)
      radeonChooseVertexState( ctx );
}