Restore the UseTexEnvProgram logic.

Was removed during glsl-compiler work.  Still need to go back and revisit this
because of the interaction with fragment shaders...

src/mesa/drivers/dri/i915/i915_context.c

@@ -168,6 +168,7 @@ GLboolean i915CreateContext( const __GLcontextModes *mesaVis,
    ctx->Const.FragmentProgram.MaxNativeTexIndirections = I915_MAX_TEX_INDIRECT;
    ctx->Const.FragmentProgram.MaxNativeAddressRegs = 0; /* I don't think we have one */
    ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
+   ctx->FragmentProgram._UseTexEnvProgram = GL_TRUE;
 
 
    driInitExtensions( ctx, i915_extensions, GL_FALSE );

src/mesa/drivers/dri/i915/i915_state.c

@@ -531,7 +531,7 @@ void i915_update_fog( GLcontext *ctx )
    GLboolean enabled;
    GLboolean try_pixel_fog;
    
-   if (ctx->FragmentProgram._Enabled) {
+   if (ctx->FragmentProgram._Active) {
       /* Pull in static fog state from program */
       
       mode = ctx->FragmentProgram._Current->FogOption;

src/mesa/drivers/dri/i915/i915_vtbl.c

@@ -46,7 +46,7 @@ static void i915_render_start( intelContextPtr intel )
    GLcontext *ctx = &intel->ctx;
    i915ContextPtr i915 = I915_CONTEXT(intel);
 
-   if (ctx->FragmentProgram._Current) 
+   if (ctx->FragmentProgram._Active) 
       i915ValidateFragmentProgram( i915 );
    else {
       assert(!ctx->FragmentProgram._MaintainTexEnvProgram);

src/mesa/drivers/dri/i915tex/i915_context.c

@@ -158,7 +158,7 @@ i915CreateContext(const __GLcontextModes * mesaVis,
    ctx->Const.FragmentProgram.MaxNativeAddressRegs = 0; /* I don't think we have one */
 
    ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
-   /*ctx->_UseTexEnvProgram = 1;*/
+   ctx->_UseTexEnvProgram = GL_TRUE;
 
    driInitExtensions(ctx, i915_extensions, GL_FALSE);
 

src/mesa/drivers/dri/i915tex/i915_state.c

@@ -561,7 +561,7 @@ i915_update_fog(GLcontext * ctx)
    GLboolean enabled;
    GLboolean try_pixel_fog;
 
-   if (ctx->FragmentProgram._Enabled) {
+   if (ctx->FragmentProgram._Active) {
       /* Pull in static fog state from program */
 
       mode = ctx->FragmentProgram._Current->FogOption;

src/mesa/main/context.c

@@ -1355,14 +1355,16 @@ _mesa_initialize_context(GLcontext *ctx,
    ctx->TnlModule.SwapCount = 0;
 #endif
 
+   ctx->FragmentProgram._MaintainTexEnvProgram
+      = (_mesa_getenv("MESA_TEX_PROG") != NULL);
+   ctx->FragmentProgram._UseTexEnvProgram = ctx->FragmentProgram._MaintainTexEnvProgram;
+
    ctx->VertexProgram._MaintainTnlProgram
       = (_mesa_getenv("MESA_TNL_PROG") != NULL);
-   if (ctx->VertexProgram._MaintainTnlProgram)
+   if (ctx->VertexProgram._MaintainTnlProgram) {
       /* this is required... */
       ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
-   else
+   }
-      ctx->FragmentProgram._MaintainTexEnvProgram
-         = (_mesa_getenv("MESA_TEX_PROG") != NULL);
 
    ctx->FirstTimeCurrent = GL_TRUE;
 

src/mesa/main/mtypes.h

@@ -1987,6 +1987,7 @@ struct gl_fragment_program_state
 {
    GLboolean Enabled;     /**< User-set fragment program enable flag */
    GLboolean _Enabled;    /**< Fragment program enabled and valid? */
+   GLboolean _Active;
    struct gl_fragment_program *Current;  /**< User-bound fragment program */
 
    /** Currently enabled and valid program (including internal programs
@@ -1998,6 +1999,7 @@ struct gl_fragment_program_state
 
    /** Should fixed-function texturing be implemented with a fragment prog? */
    GLboolean _MaintainTexEnvProgram;
+   GLboolean _UseTexEnvProgram;
 
    /** Program to emulate fixed-function texture env/combine (see above) */
    struct gl_fragment_program *_TexEnvProgram;

src/mesa/main/state.c

@@ -964,6 +964,9 @@ update_program(GLcontext *ctx)
 
    if (shProg && shProg->LinkStatus) {
       /* Use shader programs */
+      /* XXX this isn't quite right, since we may have either a vertex
+       * _or_ fragment shader (not always both).
+       */
       ctx->VertexProgram._Current = shProg->VertexProgram;
       ctx->FragmentProgram._Current = shProg->FragmentProgram;
    }
@@ -1000,6 +1003,13 @@ update_program(GLcontext *ctx)
          ctx->FragmentProgram._Current = NULL;
       }
    }
+
+   ctx->FragmentProgram._Active = ctx->FragmentProgram._Enabled;
+   if (ctx->FragmentProgram._MaintainTexEnvProgram &&
+       !ctx->FragmentProgram._Enabled) {
+      if (ctx->FragmentProgram._UseTexEnvProgram)
+	 ctx->FragmentProgram._Active = GL_TRUE;
+   }
 }
 
 

src/mesa/swrast/s_aalinetemp.h

@@ -87,7 +87,7 @@ NAME(plot)(GLcontext *ctx, struct LineInfo *line, int ix, int iy)
          if (swrast->_FragmentAttribs & (1 << attr)) {
             GLfloat (*attribArray)[4] = line->span.array->attribs[attr];
             GLfloat invQ;
-            if (ctx->FragmentProgram._Current) {
+            if (ctx->FragmentProgram._Active) {
                invQ = 1.0F;
             }
             else {

src/mesa/swrast/s_pointtemp.h

@@ -121,7 +121,7 @@ NAME ( GLcontext *ctx, const SWvertex *vert )
 #endif
 #if FLAGS & TEXTURE
    span->arrayMask |= (SPAN_TEXTURE | SPAN_LAMBDA);
-   if (ctx->FragmentProgram._Current) {
+   if (ctx->FragmentProgram._Active) {
       /* Don't divide texture s,t,r by q (use TXP to do that) */
       for (attr = swrast->_MinFragmentAttrib; attr < swrast->_MaxFragmentAttrib; attr++) {
          if (swrast->_FragmentAttribs & (1 << attr)) {

src/mesa/tnl/t_context.c

@@ -138,7 +138,7 @@ _tnl_InvalidateState( GLcontext *ctx, GLuint new_state )
    }
 
    if (ctx->Fog.Enabled ||
-       (ctx->FragmentProgram._Current &&
+       (ctx->FragmentProgram._Active &&
         (ctx->FragmentProgram._Current->FogOption != GL_NONE ||
          ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_FOGC)))
       RENDERINPUTS_SET( tnl->render_inputs_bitset, _TNL_ATTRIB_FOG );