wined3d: Add the general combiner limit to wined3d_gl_info.

dlls/wined3d/directx.c

@@ -1923,7 +1923,9 @@ static BOOL IWineD3DImpl_FillGLCaps(struct wined3d_adapter *adapter)
         {
             GLint tmp;
             glGetIntegerv(GL_MAX_GENERAL_COMBINERS_NV, &tmp);
+            gl_info->limits.general_combiners = tmp;
             gl_info->limits.texture_stages = min(MAX_TEXTURES, tmp);
+            TRACE_(d3d_caps)("Max general combiners: %d.\n", tmp);
         }
         else
         {

dlls/wined3d/nvidia_texture_shader.c

@@ -670,7 +670,7 @@ static void nvrc_fragment_get_caps(const struct wined3d_gl_info *gl_info, struct
             WINED3DTEXOPCAPS_PREMODULATE */
 #endif
 
-    pCaps->MaxTextureBlendStages = gl_info->limits.texture_stages;
+    pCaps->MaxTextureBlendStages = min(MAX_TEXTURES, gl_info->limits.general_combiners);
     pCaps->MaxSimultaneousTextures = gl_info->limits.textures;
 
     pCaps->PrimitiveMiscCaps |=  WINED3DPMISCCAPS_TSSARGTEMP;

dlls/wined3d/wined3d_gl.h

@@ -4619,6 +4619,7 @@ struct wined3d_gl_limits
     UINT fragment_samplers;
     UINT vertex_samplers;
     UINT combined_samplers;
+    UINT general_combiners;
     UINT sampler_stages;
     UINT clipplanes;
     UINT texture_size;