enable GL_ARB_texture_env_crossbar on r200, separate the enable bits for texture...

diff --git a/docs/VERSIONS b/docs/VERSIONS
index fbf1f42..7a21b7c 100644 (file)
--- a/docs/VERSIONS
+++ b/docs/VERSIONS
@@ -1378,6 +1378,8 @@ Mesa Version History
     New:
        - reflect demo improved to support multiple windows
        - singlebuffer demo (shows no/little-flicker single-buffered rendering)
+       - r200: enable GL_ARB_texture_env_crossbar, separate the texture sampling
+         unit bits from the texture env combine enable bits
     Changes:
        - removed GL_HP_occlusion_test (use GL_ARB_occlusion_query instead)
     Bug fixes:

diff --git a/src/mesa/drivers/dri/r200/r200_context.c b/src/mesa/drivers/dri/r200/r200_context.c
index 77d36e3..6f8f78e 100644 (file)
--- a/src/mesa/drivers/dri/r200/r200_context.c
+++ b/src/mesa/drivers/dri/r200/r200_context.c
@@ -140,6 +140,7 @@ const struct dri_extension card_extensions[] =
     { "GL_ARB_texture_env_add",            NULL },
     { "GL_ARB_texture_env_combine",        NULL },
     { "GL_ARB_texture_env_dot3",           NULL },
+    { "GL_ARB_texture_env_crossbar",       NULL },
     { "GL_ARB_texture_mirrored_repeat",    NULL },
     { "GL_ARB_vertex_buffer_object",       GL_ARB_vertex_buffer_object_functions },
     { "GL_EXT_blend_minmax",               GL_EXT_blend_minmax_functions },

diff --git a/src/mesa/drivers/dri/r200/r200_context.h b/src/mesa/drivers/dri/r200/r200_context.h
index 8169af7..89b0b35 100644 (file)
--- a/src/mesa/drivers/dri/r200/r200_context.h
+++ b/src/mesa/drivers/dri/r200/r200_context.h
@@ -172,8 +172,8 @@ struct r200_tex_obj {
 
 struct r200_texture_env_state {
    r200TexObjPtr texobj;
-   GLenum format;
-   GLenum envMode;
+   GLuint outputreg;
+   GLuint unitneeded;
 };
 
 #define R200_MAX_TEXTURE_UNITS 6
@@ -544,6 +544,7 @@ struct r200_state {
    struct r200_stencilbuffer_state stencil;
    struct r200_stipple_state stipple;
    struct r200_texture_state texture;
+   GLuint envneeded;
 };
 
 /* Need refcounting on dma buffers:

diff --git a/src/mesa/drivers/dri/r200/r200_reg.h b/src/mesa/drivers/dri/r200/r200_reg.h
index dd5f17c..d19f9df 100644 (file)
--- a/src/mesa/drivers/dri/r200/r200_reg.h
+++ b/src/mesa/drivers/dri/r200/r200_reg.h
@@ -172,6 +172,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define     R200_TEX_BLEND_4_ENABLE                   0x00010000
 #define     R200_TEX_BLEND_5_ENABLE                   0x00020000
 #define     R200_TEX_BLEND_6_ENABLE                   0x00040000
+#define     R200_TEX_BLEND_ENABLE_MASK                0x0007f800
+#define     R200_TEX_BLEND_0_ENABLE_SHIFT             (12)
 #define     R200_MULTI_PASS_ENABLE                    0x00080000
 #define     R200_SPECULAR_ENABLE                      0x00200000
 #define     R200_FOG_ENABLE                           0x00400000
@@ -1146,6 +1148,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define     R200_TXC_CLAMP_WRAP                    (0 << 12)
 #define     R200_TXC_CLAMP_0_1                     (1 << 12)
 #define     R200_TXC_CLAMP_8_8                     (2 << 12)
+#define     R200_TXC_OUTPUT_REG_SHIFT              16
 #define     R200_TXC_OUTPUT_REG_MASK               (7 << 16)
 #define     R200_TXC_OUTPUT_REG_NONE               (0 << 16)
 #define     R200_TXC_OUTPUT_REG_R0                 (1 << 16)
@@ -1288,6 +1291,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define     R200_TXA_CLAMP_WRAP                    (0 << 12)
 #define     R200_TXA_CLAMP_0_1                     (1 << 12)
 #define     R200_TXA_CLAMP_8_8                     (2 << 12)
+#define     R200_TXA_OUTPUT_REG_SHIFT              16
 #define     R200_TXA_OUTPUT_REG_MASK               (7 << 16)
 #define     R200_TXA_OUTPUT_REG_NONE               (0 << 16)
 #define     R200_TXA_OUTPUT_REG_R0                 (1 << 16)

diff --git a/src/mesa/drivers/dri/r200/r200_state_init.c b/src/mesa/drivers/dri/r200/r200_state_init.c
index f004cf7..30e0dfa 100644 (file)
--- a/src/mesa/drivers/dri/r200/r200_state_init.c
+++ b/src/mesa/drivers/dri/r200/r200_state_init.c
@@ -118,7 +118,9 @@ static int cmdscl2( int offset, int stride, int count )
 #define CHECK( NM, FLAG )                              \
 static GLboolean check_##NM( GLcontext *ctx, int idx ) \
 {                                                      \
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);           \
    (void) idx;                                         \
+   (void) rmesa;                                       \
    return FLAG;                                                \
 }
 
@@ -135,12 +137,13 @@ static GLboolean check_##NM( GLcontext *ctx, int idx )    \
 CHECK( always, GL_TRUE )
 CHECK( never, GL_FALSE )
 CHECK( tex_any, ctx->Texture._EnabledUnits )
-CHECK( tex_pair, (ctx->Texture.Unit[idx]._ReallyEnabled | ctx->Texture.Unit[idx & ~1]._ReallyEnabled))
-CHECK( tex, ctx->Texture.Unit[idx]._ReallyEnabled )
-CHECK( tex_cube, ctx->Texture.Unit[idx]._ReallyEnabled & TEXTURE_CUBE_BIT)
+CHECK( tex_pair, (rmesa->state.texture.unit[idx].unitneeded | rmesa->state.texture.unit[idx & ~1].unitneeded))
+CHECK( tex, rmesa->state.texture.unit[idx].unitneeded )
+CHECK( texenv, rmesa->state.envneeded & (1 << idx) )
+CHECK( tex_cube, rmesa->state.texture.unit[idx].unitneeded & TEXTURE_CUBE_BIT )
 CHECK( fog, ctx->Fog.Enabled )
 TCL_CHECK( tcl, GL_TRUE )
-TCL_CHECK( tcl_tex, ctx->Texture.Unit[idx]._ReallyEnabled )
+TCL_CHECK( tcl_tex, rmesa->state.texture.unit[idx].unitneeded )
 TCL_CHECK( tcl_lighting, ctx->Light.Enabled )
 TCL_CHECK( tcl_light, ctx->Light.Enabled && ctx->Light.Light[idx].Enabled )
 TCL_CHECK( tcl_ucp, (ctx->Transform.ClipPlanesEnabled & (1 << idx)) )
@@ -300,11 +303,11 @@ void r200InitState( r200ContextPtr rmesa )
    ALLOC_STATE( lit[6], tcl_light, LIT_STATE_SIZE, "LIT/light-6", 6 );
    ALLOC_STATE( lit[7], tcl_light, LIT_STATE_SIZE, "LIT/light-7", 7 );
    ALLOC_STATE( pix[0], always, PIX_STATE_SIZE, "PIX/pixstage-0", 0 );
-   ALLOC_STATE( pix[1], tex, PIX_STATE_SIZE, "PIX/pixstage-1", 1 );
-   ALLOC_STATE( pix[2], tex, PIX_STATE_SIZE, "PIX/pixstage-2", 2 );
-   ALLOC_STATE( pix[3], tex, PIX_STATE_SIZE, "PIX/pixstage-3", 3 );
-   ALLOC_STATE( pix[4], tex, PIX_STATE_SIZE, "PIX/pixstage-4", 4 );
-   ALLOC_STATE( pix[5], tex, PIX_STATE_SIZE, "PIX/pixstage-5", 5 );
+   ALLOC_STATE( pix[1], texenv, PIX_STATE_SIZE, "PIX/pixstage-1", 1 );
+   ALLOC_STATE( pix[2], texenv, PIX_STATE_SIZE, "PIX/pixstage-2", 2 );
+   ALLOC_STATE( pix[3], texenv, PIX_STATE_SIZE, "PIX/pixstage-3", 3 );
+   ALLOC_STATE( pix[4], texenv, PIX_STATE_SIZE, "PIX/pixstage-4", 4 );
+   ALLOC_STATE( pix[5], texenv, PIX_STATE_SIZE, "PIX/pixstage-5", 5 );
    if (rmesa->r200Screen->drmSupportsTriPerf) {
       ALLOC_STATE( prf, always, PRF_STATE_SIZE, "PRF/performance-tri", 0 );
    }

diff --git a/src/mesa/drivers/dri/r200/r200_texstate.c b/src/mesa/drivers/dri/r200/r200_texstate.c
index 4a6b285..b79f3ac 100644 (file)
--- a/src/mesa/drivers/dri/r200/r200_texstate.c
+++ b/src/mesa/drivers/dri/r200/r200_texstate.c
@@ -407,6 +407,14 @@ static GLuint r200_tfactor_color[] =
    R200_TXC_ARG_A_TFACTOR_ALPHA | R200_TXC_COMP_ARG_A
 };
 
+static GLuint r200_tfactor1_color[] =
+{
+   R200_TXC_ARG_A_TFACTOR1_COLOR,
+   R200_TXC_ARG_A_TFACTOR1_COLOR | R200_TXC_COMP_ARG_A,
+   R200_TXC_ARG_A_TFACTOR1_ALPHA,
+   R200_TXC_ARG_A_TFACTOR1_ALPHA | R200_TXC_COMP_ARG_A
+};
+
 static GLuint r200_primary_color[] =
 {
    R200_TXC_ARG_A_DIFFUSE_COLOR,
@@ -455,6 +463,12 @@ static GLuint r200_tfactor_alpha[] =
    R200_TXA_ARG_A_TFACTOR_ALPHA | R200_TXA_COMP_ARG_A
 };
 
+static GLuint r200_tfactor1_alpha[] =
+{
+   R200_TXA_ARG_A_TFACTOR1_ALPHA,
+   R200_TXA_ARG_A_TFACTOR1_ALPHA | R200_TXA_COMP_ARG_A
+};
+
 static GLuint r200_primary_alpha[] =
 {
    R200_TXA_ARG_A_DIFFUSE_ALPHA,
@@ -500,15 +514,17 @@ do {                                                      \
  * Texture unit state management
  */
 
-static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
+static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit, int slot, GLuint replaceargs )
 {
    r200ContextPtr rmesa = R200_CONTEXT(ctx);
    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
    GLuint color_combine, alpha_combine;
-   GLuint color_scale = rmesa->hw.pix[unit].cmd[PIX_PP_TXCBLEND2] &
-      ~(R200_TXC_SCALE_MASK);
-   GLuint alpha_scale = rmesa->hw.pix[unit].cmd[PIX_PP_TXABLEND2] &
-      ~(R200_TXA_DOT_ALPHA | R200_TXA_SCALE_MASK);
+   GLuint color_scale = rmesa->hw.pix[slot].cmd[PIX_PP_TXCBLEND2] &
+      ~(R200_TXC_SCALE_MASK | R200_TXC_OUTPUT_REG_MASK | R200_TXC_TFACTOR_SEL_MASK |
+       R200_TXC_TFACTOR1_SEL_MASK);
+   GLuint alpha_scale = rmesa->hw.pix[slot].cmd[PIX_PP_TXABLEND2] &
+      ~(R200_TXA_DOT_ALPHA | R200_TXA_SCALE_MASK | R200_TXA_OUTPUT_REG_MASK |
+       R200_TXA_TFACTOR_SEL_MASK | R200_TXA_TFACTOR1_SEL_MASK);
 
    /* texUnit->_Current can be NULL if and only if the texture unit is
     * not actually enabled.
@@ -526,24 +542,20 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
     * reduces the amount of special-casing we have to do, alpha-only
     * textures being a notable exception.
     */
-   /* Don't cache these results.
-    */
-   rmesa->state.texture.unit[unit].format = 0;
-   rmesa->state.texture.unit[unit].envMode = 0;
+
+   color_scale |= ((rmesa->state.texture.unit[unit].outputreg + 1) << R200_TXC_OUTPUT_REG_SHIFT) |
+                       (unit << R200_TXC_TFACTOR_SEL_SHIFT) |
+                       (replaceargs << R200_TXC_TFACTOR1_SEL_SHIFT);
+   alpha_scale |= ((rmesa->state.texture.unit[unit].outputreg + 1) << R200_TXA_OUTPUT_REG_SHIFT) |
+                       (unit << R200_TXA_TFACTOR_SEL_SHIFT) |
+                       (replaceargs << R200_TXA_TFACTOR1_SEL_SHIFT);
 
    if ( !texUnit->_ReallyEnabled ) {
-      if ( unit == 0 ) {
-        color_combine = R200_TXC_ARG_A_ZERO | R200_TXC_ARG_B_ZERO
-            | R200_TXC_ARG_C_DIFFUSE_COLOR | R200_TXC_OP_MADD;
-        alpha_combine = R200_TXA_ARG_A_ZERO | R200_TXA_ARG_B_ZERO
-            | R200_TXA_ARG_C_DIFFUSE_ALPHA | R200_TXA_OP_MADD;
-      }
-      else {
-        color_combine = R200_TXC_ARG_A_ZERO | R200_TXC_ARG_B_ZERO
-            | R200_TXC_ARG_C_R0_COLOR | R200_TXC_OP_MADD;
-        alpha_combine = R200_TXA_ARG_A_ZERO | R200_TXA_ARG_B_ZERO
-            | R200_TXA_ARG_C_R0_ALPHA | R200_TXA_OP_MADD;
-      }
+      assert( unit == 0);
+      color_combine = R200_TXC_ARG_A_ZERO | R200_TXC_ARG_B_ZERO
+         | R200_TXC_ARG_C_DIFFUSE_COLOR | R200_TXC_OP_MADD;
+      alpha_combine = R200_TXA_ARG_A_ZERO | R200_TXA_ARG_B_ZERO
+         | R200_TXA_ARG_C_DIFFUSE_ALPHA | R200_TXA_OP_MADD;
    }
    else {
       GLuint color_arg[3], alpha_arg[3];
@@ -554,14 +566,20 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
       GLuint Ashift = texUnit->_CurrentCombine->ScaleShiftA;
 
 
+      const GLint replaceoprgb =
+        ctx->Texture.Unit[replaceargs]._CurrentCombine->OperandRGB[0] - GL_SRC_COLOR;
+      const GLint replaceopa =
+        ctx->Texture.Unit[replaceargs]._CurrentCombine->OperandA[0] - GL_SRC_ALPHA;
+
       /* 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;
+        GLint op = texUnit->_CurrentCombine->OperandRGB[i] - GL_SRC_COLOR;
+        const GLint srcRGBi = texUnit->_CurrentCombine->SourceRGB[i];
         assert(op >= 0);
         assert(op <= 3);
-        switch ( texUnit->_CurrentCombine->SourceRGB[i] ) {
+        switch ( srcRGBi ) {
         case GL_TEXTURE:
            color_arg[i] = r200_register_color[op][unit];
            break;
@@ -572,10 +590,54 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
            color_arg[i] = r200_primary_color[op];
            break;
         case GL_PREVIOUS:
-           if (unit == 0)
-               color_arg[i] = r200_primary_color[op];
-           else
-               color_arg[i] = r200_register_color[op][0];
+           if (replaceargs != unit) {
+              const GLint srcRGBreplace = ctx->Texture.Unit[replaceargs]._CurrentCombine->SourceRGB[0];
+              if (op >= 2) {
+                 op = op ^ replaceopa;
+              }
+              else {
+                 op = op ^ replaceoprgb;
+              }
+              switch (srcRGBreplace) {
+              case GL_TEXTURE:
+                 color_arg[i] = r200_register_color[op][replaceargs];
+                 break;
+              case GL_CONSTANT:
+                 color_arg[i] = r200_tfactor1_color[op];
+                 break;
+              case GL_PRIMARY_COLOR:
+                 color_arg[i] = r200_primary_color[op];
+                 break;
+              case GL_PREVIOUS:
+                 if (slot == 0)
+                    color_arg[i] = r200_primary_color[op];
+                 else
+                    color_arg[i] = r200_register_color[op][rmesa->state.texture.unit[replaceargs - 1].outputreg];
+                 break;
+              case GL_ZERO:
+                 color_arg[i] = r200_zero_color[op];
+                 break;
+              case GL_ONE:
+                 color_arg[i] = r200_zero_color[op+1];
+                 break;
+              case GL_TEXTURE0:
+              case GL_TEXTURE1:
+              case GL_TEXTURE2:
+              case GL_TEXTURE3:
+              case GL_TEXTURE4:
+              case GL_TEXTURE5:
+                 color_arg[i] = r200_register_color[op][srcRGBreplace - GL_TEXTURE0];
+                 break;
+              default:
+              return GL_FALSE;
+              }
+           }
+           else {
+              if (slot == 0)
+                 color_arg[i] = r200_primary_color[op];
+              else
+                 color_arg[i] = r200_register_color[op][rmesa->state.texture.unit[unit - 1].outputreg];
+            }
            break;
         case GL_ZERO:
            color_arg[i] = r200_zero_color[op];
@@ -583,16 +645,25 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
         case GL_ONE:
            color_arg[i] = r200_zero_color[op+1];
            break;
+        case GL_TEXTURE0:
+        case GL_TEXTURE1:
+        case GL_TEXTURE2:
+        case GL_TEXTURE3:
+        case GL_TEXTURE4:
+        case GL_TEXTURE5:
+           color_arg[i] = r200_register_color[op][srcRGBi - GL_TEXTURE0];
+           break;
         default:
            return GL_FALSE;
         }
       }
 
       for ( i = 0 ; i < numAlphaArgs ; i++ ) {
-        const GLint op = texUnit->_CurrentCombine->OperandA[i] - GL_SRC_ALPHA;
+        GLint op = texUnit->_CurrentCombine->OperandA[i] - GL_SRC_ALPHA;
+        const GLint srcAi = texUnit->_CurrentCombine->SourceA[i];
         assert(op >= 0);
         assert(op <= 1);
-        switch ( texUnit->_CurrentCombine->SourceA[i] ) {
+        switch ( srcAi ) {
         case GL_TEXTURE:
            alpha_arg[i] = r200_register_alpha[op][unit];
            break;
@@ -603,10 +674,49 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
            alpha_arg[i] = r200_primary_alpha[op];
            break;
         case GL_PREVIOUS:
-           if (unit == 0)
-               alpha_arg[i] = r200_primary_alpha[op];
-           else
-               alpha_arg[i] = r200_register_alpha[op][0];
+           if (replaceargs != unit) {
+              const GLint srcAreplace = ctx->Texture.Unit[replaceargs]._CurrentCombine->SourceA[0];
+              op = op ^ replaceopa;
+              switch (srcAreplace) {
+              case GL_TEXTURE:
+                 alpha_arg[i] = r200_register_alpha[op][replaceargs];
+                 break;
+              case GL_CONSTANT:
+                 alpha_arg[i] = r200_tfactor1_alpha[op];
+                 break;
+              case GL_PRIMARY_COLOR:
+                 alpha_arg[i] = r200_primary_alpha[op];
+                 break;
+              case GL_PREVIOUS:
+                 if (slot == 0)
+                    alpha_arg[i] = r200_primary_alpha[op];
+                 else
+                    alpha_arg[i] = r200_register_alpha[op][rmesa->state.texture.unit[replaceargs - 1].outputreg];
+                 break;
+              case GL_ZERO:
+                 alpha_arg[i] = r200_zero_alpha[op];
+                 break;
+              case GL_ONE:
+                 alpha_arg[i] = r200_zero_alpha[op+1];
+                 break;
+              case GL_TEXTURE0:
+              case GL_TEXTURE1:
+              case GL_TEXTURE2:
+              case GL_TEXTURE3:
+              case GL_TEXTURE4:
+              case GL_TEXTURE5:
+                 alpha_arg[i] = r200_register_alpha[op][srcAreplace - GL_TEXTURE0];
+                 break;
+              default:
+              return GL_FALSE;
+              }
+           }
+           else {
+              if (slot == 0)
+                 alpha_arg[i] = r200_primary_alpha[op];
+              else
+                 alpha_arg[i] = r200_register_alpha[op][rmesa->state.texture.unit[unit - 1].outputreg];
+            }
            break;
         case GL_ZERO:
            alpha_arg[i] = r200_zero_alpha[op];
@@ -614,6 +724,14 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
         case GL_ONE:
            alpha_arg[i] = r200_zero_alpha[op+1];
            break;
+        case GL_TEXTURE0:
+        case GL_TEXTURE1:
+        case GL_TEXTURE2:
+        case GL_TEXTURE3:
+        case GL_TEXTURE4:
+        case GL_TEXTURE5:
+           alpha_arg[i] = r200_register_alpha[op][srcAi - GL_TEXTURE0];
+           break;
         default:
            return GL_FALSE;
         }
@@ -801,20 +919,188 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
        */
    }
 
-   if ( rmesa->hw.pix[unit].cmd[PIX_PP_TXCBLEND] != color_combine ||
-       rmesa->hw.pix[unit].cmd[PIX_PP_TXABLEND] != alpha_combine ||
-       rmesa->hw.pix[unit].cmd[PIX_PP_TXCBLEND2] != color_scale ||
-       rmesa->hw.pix[unit].cmd[PIX_PP_TXABLEND2] != alpha_scale) {
-      R200_STATECHANGE( rmesa, pix[unit] );
-      rmesa->hw.pix[unit].cmd[PIX_PP_TXCBLEND] = color_combine;
-      rmesa->hw.pix[unit].cmd[PIX_PP_TXABLEND] = alpha_combine;
-      rmesa->hw.pix[unit].cmd[PIX_PP_TXCBLEND2] = color_scale;
-      rmesa->hw.pix[unit].cmd[PIX_PP_TXABLEND2] = alpha_scale;
+   if ( rmesa->hw.pix[slot].cmd[PIX_PP_TXCBLEND] != color_combine ||
+       rmesa->hw.pix[slot].cmd[PIX_PP_TXABLEND] != alpha_combine ||
+       rmesa->hw.pix[slot].cmd[PIX_PP_TXCBLEND2] != color_scale ||
+       rmesa->hw.pix[slot].cmd[PIX_PP_TXABLEND2] != alpha_scale) {
+      R200_STATECHANGE( rmesa, pix[slot] );
+      rmesa->hw.pix[slot].cmd[PIX_PP_TXCBLEND] = color_combine;
+      rmesa->hw.pix[slot].cmd[PIX_PP_TXABLEND] = alpha_combine;
+      rmesa->hw.pix[slot].cmd[PIX_PP_TXCBLEND2] = color_scale;
+      rmesa->hw.pix[slot].cmd[PIX_PP_TXABLEND2] = alpha_scale;
    }
 
    return GL_TRUE;
 }
 
+#define REF_COLOR 1
+#define REF_ALPHA 2
+
+static GLboolean r200UpdateAllTexEnv( GLcontext *ctx )
+{
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
+   GLint i, j, currslot;
+   GLint maxunitused = -1;
+   GLboolean texregfree[6] = {GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE};
+   GLubyte stageref[7] = {0, 0, 0, 0, 0, 0, 0};
+   GLint nextunit[R200_MAX_TEXTURE_UNITS] = {0, 0, 0, 0, 0, 0};
+   GLint currentnext = -1;
+   GLboolean ok;
+
+   /* find highest used unit */
+   for ( j = 0; j < R200_MAX_TEXTURE_UNITS; j++) {
+      if (ctx->Texture.Unit[j]._ReallyEnabled) {
+        maxunitused = j;
+      }
+   }
+   stageref[maxunitused + 1] = REF_COLOR | REF_ALPHA;
+
+   for ( j = maxunitused; j >= 0; j-- ) {
+      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[j];
+
+      rmesa->state.texture.unit[j].outputreg = -1;
+
+      if (stageref[j + 1]) {
+
+        /* use the lowest available reg. That gets us automatically reg0 for the last stage.
+           need this even for disabled units, as it may get referenced due to the replace
+           optimization */
+        for ( i = 0 ; i < R200_MAX_TEXTURE_UNITS; i++ ) {
+           if (texregfree[i]) {
+              rmesa->state.texture.unit[j].outputreg = i;
+              break;
+           }
+        }
+        if (rmesa->state.texture.unit[j].outputreg == -1) {
+           /* no more free regs we can use. Need a fallback :-( */
+           return GL_FALSE;
+         }
+
+         nextunit[j] = currentnext;
+
+         if (!texUnit->_ReallyEnabled) {
+        /* the not enabled stages are referenced "indirectly",
+            must not cut off the lower stages */
+           stageref[j] = REF_COLOR | REF_ALPHA;
+           continue;
+         }
+        currentnext = j;
+ 
+        const GLuint numColorArgs = texUnit->_CurrentCombine->_NumArgsRGB;
+        const GLuint numAlphaArgs = texUnit->_CurrentCombine->_NumArgsA;
+        const GLboolean isdot3rgba = (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) ||
+                                     (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT);
+
+
+        /* check if we need the color part, special case for dot3_rgba
+           as if only the alpha part is referenced later on it still is using the color part */
+        if ((stageref[j + 1] & REF_COLOR) || isdot3rgba) {
+           for ( i = 0 ; i < numColorArgs ; i++ ) {
+              const GLuint srcRGBi = texUnit->_CurrentCombine->SourceRGB[i];
+              const GLuint op = texUnit->_CurrentCombine->OperandRGB[i];
+              switch ( srcRGBi ) {
+              case GL_PREVIOUS:
+                 /* op 0/1 are referencing color, op 2/3 alpha */
+                 stageref[j] |= (op >> 1) + 1;
+                 break;
+              case GL_TEXTURE:
+                 texregfree[j] = GL_FALSE;
+                 break;
+              case GL_TEXTURE0:
+              case GL_TEXTURE1:
+              case GL_TEXTURE2:
+              case GL_TEXTURE3:
+              case GL_TEXTURE4:
+              case GL_TEXTURE5:
+                 texregfree[srcRGBi - GL_TEXTURE0] = GL_FALSE;
+                 break;
+              default: /* don't care about other sources here */
+                 break;
+              }
+           }
+        }
+
+        /* alpha args are ignored for dot3_rgba */
+        if ((stageref[j + 1] & REF_ALPHA) && !isdot3rgba) {
+
+           for ( i = 0 ; i < numAlphaArgs ; i++ ) {
+              const GLuint srcAi = texUnit->_CurrentCombine->SourceA[i];
+              switch ( srcAi ) {
+              case GL_PREVIOUS:
+                 stageref[j] |= REF_ALPHA;
+                 break;
+              case GL_TEXTURE:
+                 texregfree[j] = GL_FALSE;
+                 break;
+              case GL_TEXTURE0:
+              case GL_TEXTURE1:
+              case GL_TEXTURE2:
+              case GL_TEXTURE3:
+              case GL_TEXTURE4:
+              case GL_TEXTURE5:
+                 texregfree[srcAi - GL_TEXTURE0] = GL_FALSE;
+                 break;
+              default: /* don't care about other sources here */
+                 break;
+              }
+           }
+        }
+      }
+   }
+
+   /* don't enable texture sampling for units if the result is not used */
+   for (i = 0; i < R200_MAX_TEXTURE_UNITS; i++) {
+      if (ctx->Texture.Unit[i]._ReallyEnabled && !texregfree[i])
+        rmesa->state.texture.unit[i].unitneeded = ctx->Texture.Unit[i]._ReallyEnabled;
+      else rmesa->state.texture.unit[i].unitneeded = 0;
+   }
+
+   ok = GL_TRUE;
+   currslot = 0;
+   rmesa->state.envneeded = 1;
+
+   i = 0;
+   while ((i <= maxunitused) && (i >= 0)) {
+      /* only output instruction if the results are referenced */
+      if (ctx->Texture.Unit[i]._ReallyEnabled && stageref[i+1]) {
+         GLuint replaceunit = i;
+        /* try to optimize GL_REPLACE away (only one level deep though) */
+        if (   (ctx->Texture.Unit[i]._CurrentCombine->ModeRGB == GL_REPLACE) &&
+               (ctx->Texture.Unit[i]._CurrentCombine->ModeA == GL_REPLACE) &&
+               (ctx->Texture.Unit[i]._CurrentCombine->ScaleShiftRGB == 0) &&
+               (ctx->Texture.Unit[i]._CurrentCombine->ScaleShiftA == 0) &&
+               (nextunit[i] > 0) ) {
+           /* yippie! can optimize it away! */
+           replaceunit = i;
+           i = nextunit[i];
+        }
+
+        /* need env instruction slot */
+        rmesa->state.envneeded |= 1 << currslot;
+        ok = r200UpdateTextureEnv( ctx, i, currslot, replaceunit );
+        if (!ok) return GL_FALSE;
+        currslot++;
+      }
+      i = i + 1;
+   }
+
+   if (currslot == 0) {
+      /* need one stage at least */
+      rmesa->state.texture.unit[0].outputreg = 0;
+      ok = r200UpdateTextureEnv( ctx, 0, 0, 0 );
+   }
+
+   R200_STATECHANGE( rmesa, ctx );
+   rmesa->hw.ctx.cmd[CTX_PP_CNTL] &= ~R200_TEX_BLEND_ENABLE_MASK;
+   rmesa->hw.ctx.cmd[CTX_PP_CNTL] |= rmesa->state.envneeded << R200_TEX_BLEND_0_ENABLE_SHIFT;
+
+   return ok;
+}
+
+#undef REF_COLOR
+#undef REF_ALPHA
+
+
 #define TEXOBJ_TXFILTER_MASK (R200_MAX_MIP_LEVEL_MASK |                \
                              R200_MIN_FILTER_MASK |            \
                              R200_MAG_FILTER_MASK |            \
@@ -1063,9 +1349,7 @@ static void disable_tex( GLcontext *ctx, int unit )
       }
 
       R200_STATECHANGE( rmesa, ctx );
-      rmesa->hw.ctx.cmd[CTX_PP_CNTL] &= ~((R200_TEX_0_ENABLE |
-                                          R200_TEX_BLEND_0_ENABLE) << unit);
-      rmesa->hw.ctx.cmd[CTX_PP_CNTL] |= R200_TEX_BLEND_0_ENABLE; 
+      rmesa->hw.ctx.cmd[CTX_PP_CNTL] &= ~(R200_TEX_0_ENABLE << unit);
         
       R200_STATECHANGE( rmesa, vtx );
       rmesa->hw.vtx.cmd[VTX_TCL_OUTPUT_VTXFMT_1] &= ~(7 << (unit * 3));
@@ -1077,10 +1361,6 @@ static void disable_tex( GLcontext *ctx, int unit )
       /* Actually want to keep all units less than max active texture
        * enabled, right?  Fix this for >2 texunits.
        */
-      /* FIXME: What should happen here if r200UpdateTextureEnv fails? */
-      if (unit == 0) 
-        r200UpdateTextureEnv( ctx, unit ); 
-
 
       {
         GLuint tmp = rmesa->TexGenEnabled;
@@ -1258,7 +1538,6 @@ static GLboolean update_tex_common( GLcontext *ctx, int unit )
    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
    struct gl_texture_object *tObj = texUnit->_Current;
    r200TexObjPtr t = (r200TexObjPtr) tObj->DriverData;
-   GLenum format;
 
    /* Fallback if there's a texture border */
    if ( tObj->Image[0][tObj->BaseLevel]->Border > 0 )
@@ -1288,8 +1567,7 @@ static GLboolean update_tex_common( GLcontext *ctx, int unit )
     */
    if ( 1|| !(rmesa->hw.ctx.cmd[CTX_PP_CNTL] & (R200_TEX_0_ENABLE<<unit))) {
       R200_STATECHANGE( rmesa, ctx );
-      rmesa->hw.ctx.cmd[CTX_PP_CNTL] |= (R200_TEX_0_ENABLE | 
-                                        R200_TEX_BLEND_0_ENABLE) << unit;
+      rmesa->hw.ctx.cmd[CTX_PP_CNTL] |= R200_TEX_0_ENABLE << unit;
 
       R200_STATECHANGE( rmesa, vtx );
       rmesa->hw.vtx.cmd[VTX_TCL_OUTPUT_VTXFMT_1] &= ~(7 << (unit * 3));
@@ -1309,16 +1587,6 @@ static GLboolean update_tex_common( GLcontext *ctx, int unit )
       rmesa->NewGLState |= _NEW_TEXTURE_MATRIX;
    }
 
-   format = tObj->Image[0][tObj->BaseLevel]->Format;
-   if ( rmesa->state.texture.unit[unit].format != format ||
-       rmesa->state.texture.unit[unit].envMode != texUnit->EnvMode ) {
-      rmesa->state.texture.unit[unit].format = format;
-      rmesa->state.texture.unit[unit].envMode = texUnit->EnvMode;
-      if ( ! r200UpdateTextureEnv( ctx, unit ) ) {
-        return GL_FALSE;
-      }
-   }
-
    FALLBACK( rmesa, R200_FALLBACK_BORDER_MODE, t->border_fallback );
    return !t->border_fallback;
 }
@@ -1327,27 +1595,27 @@ static GLboolean update_tex_common( GLcontext *ctx, int unit )
 
 static GLboolean r200UpdateTextureUnit( GLcontext *ctx, int unit )
 {
-   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
 
-   if ( texUnit->_ReallyEnabled & (TEXTURE_RECT_BIT) ) {
+   if ( rmesa->state.texture.unit[unit].unitneeded & (TEXTURE_RECT_BIT) ) {
       return (enable_tex_rect( ctx, unit ) &&
              update_tex_common( ctx, unit ));
    }
-   else if ( texUnit->_ReallyEnabled & (TEXTURE_1D_BIT | TEXTURE_2D_BIT) ) {
+   else if (  rmesa->state.texture.unit[unit].unitneeded & (TEXTURE_1D_BIT | TEXTURE_2D_BIT) ) {
       return (enable_tex_2d( ctx, unit ) &&
              update_tex_common( ctx, unit ));
    }
 #if ENABLE_HW_3D_TEXTURE
-   else if ( texUnit->_ReallyEnabled & (TEXTURE_3D_BIT) ) {
+   else if ( rmesa->state.texture.unit[unit].unitneeded & (TEXTURE_3D_BIT) ) {
       return (enable_tex_3d( ctx, unit ) &&
              update_tex_common( ctx, unit ));
    }
 #endif
-   else if ( texUnit->_ReallyEnabled & (TEXTURE_CUBE_BIT) ) {
+   else if ( rmesa->state.texture.unit[unit].unitneeded & (TEXTURE_CUBE_BIT) ) {
       return (enable_tex_cube( ctx, unit ) &&
              update_tex_common( ctx, unit ));
    }
-   else if ( texUnit->_ReallyEnabled ) {
+   else if ( rmesa->state.texture.unit[unit].unitneeded ) {
       return GL_FALSE;
    }
    else {
@@ -1363,12 +1631,16 @@ void r200UpdateTextureState( GLcontext *ctx )
    GLboolean ok;
    GLuint dbg;
 
-   ok = (r200UpdateTextureUnit( ctx, 0 ) &&
+   ok = r200UpdateAllTexEnv( ctx );
+
+   if (ok) {
+      ok = (r200UpdateTextureUnit( ctx, 0 ) &&
         r200UpdateTextureUnit( ctx, 1 ) &&
         r200UpdateTextureUnit( ctx, 2 ) &&
         r200UpdateTextureUnit( ctx, 3 ) &&
         r200UpdateTextureUnit( ctx, 4 ) &&
         r200UpdateTextureUnit( ctx, 5 ));
+   }
 
    FALLBACK( rmesa, R200_FALLBACK_TEXTURE, !ok );