gles2: Remove the special wrapper for glBindTexture

Previously the GLES2 backend needed a special wrapper for
glBindTexture because it needed to know the internal GL format of the
texture in order to correctly implement the GL_MODULATE texture env
mode. When GL_MODULATE is used then the RGB values are taken from the
previous texture layer rather than being fetched from the
texture. However since the material API was added Cogl no longer uses
the GL_MODULATE texture env mode but instead always uses GL_COMBINE.

Compiling the GLES2 backend broke since the more-texture-backends
branch merge because the cogl_get_internal_gl_format function was
removed and there was one place in GLES2 specific code that was using
this to bind the texture.

cogl/cogl-material.c

@@ -1400,9 +1400,6 @@ _cogl_material_flush_layers_gl_state (CoglMaterial *material,
       CoglHandle         tex_handle;
       GLuint             gl_texture;
       GLenum             gl_target;
-#ifdef HAVE_COGL_GLES2
-      GLenum             gl_internal_format;
-#endif
       CoglTextureUnit   *unit;
 
       _cogl_material_layer_ensure_mipmaps (layer_handle);
@@ -1460,14 +1457,7 @@ _cogl_material_flush_layers_gl_state (CoglMaterial *material,
          we'd need to ensure they affect the cache. Also deleting a
          texture should clear it from the cache in case a new texture
          is generated with the same number */
-#ifdef HAVE_COGL_GLES2
-      gl_internal_format = _cogl_texture_get_internal_gl_format (tex_handle);
-      cogl_gles2_wrapper_bind_texture (gl_target,
-                                       gl_texture,
-                                       gl_internal_format);
-#else
       GE (glBindTexture (gl_target, gl_texture));
-#endif
 
       /* XXX: Once we add caching for glBindTexture state, these
        * checks should be moved back up to the top of the loop!

cogl/cogl-texture-2d-sliced.c

@@ -847,9 +847,8 @@ _cogl_texture_2d_sliced_slices_create (CoglTexture2DSliced *tex_2ds,
                      y_span->size - y_span->waste);
 
           /* Setup texture parameters */
-          GE( _cogl_texture_driver_bind (tex_2ds->gl_target,
-                                         gl_handles[y * n_x_slices + x],
-                                         gl_intformat) );
+          GE( glBindTexture (tex_2ds->gl_target,
+                             gl_handles[y * n_x_slices + x] ) );
 
           _cogl_texture_driver_try_setting_gl_border_color (tex_2ds->gl_target,
                                                             transparent_color);

cogl/cogl-texture-driver.h

@@ -33,13 +33,6 @@ void
 _cogl_texture_driver_gen (GLenum   gl_target,
                           GLsizei  n,
                           GLuint  *textures);
-/*
- * Basically just a wrapper around glBindTexture, but the GLES2 backend
- * for example also wants to know about the internal format so it can
- * identify when alpha only textures are bound.
- */
-void
-_cogl_texture_driver_bind (GLenum gl_target, GLuint gl_handle, GLenum gl_intformat);
 
 /*
  * This sets up the glPixelStore state for an upload to a destination with

cogl/driver/gl/cogl-texture-driver.c

@@ -74,14 +74,6 @@ _cogl_texture_driver_gen (GLenum   gl_target,
     }
 }
 
-void
-_cogl_texture_driver_bind (GLenum gl_target,
-                           GLuint gl_handle,
-                           GLenum gl_intformat)
-{
-  GE (glBindTexture (gl_target, gl_handle));
-}
-
 /* OpenGL - unlike GLES - can upload a sub region of pixel data from a larger
  * source buffer */
 static void
@@ -149,8 +141,6 @@ _cogl_texture_driver_upload_subregion_to_gl (GLenum       gl_target,
                                   src_y,
                                   bpp);
 
-  /* We don't need to use _cogl_texture_driver_bind here because we're
-     not using the bound texture to render yet */
   GE( glBindTexture (gl_target, gl_handle) );
 
   GE( glTexSubImage2D (gl_target, 0,
@@ -174,8 +164,6 @@ _cogl_texture_driver_upload_to_gl (GLenum       gl_target,
   /* Setup gl alignment to match rowstride and top-left corner */
   prep_gl_for_pixels_upload_full (source_bmp->rowstride, 0, 0, bpp);
 
-  /* We don't need to use _cogl_texture_driver_bind here because we're
-     not using the bound texture to render yet */
   GE( glBindTexture (gl_target, gl_handle) );
 
   GE( glTexImage2D (gl_target, 0,

cogl/driver/gles/cogl-gles2-wrapper.c

@@ -1337,28 +1337,6 @@ cogl_wrap_glDrawElements (GLenum mode, GLsizei count, GLenum type,
   glDrawElements (mode, count, type, indices);
 }
 
-void
-cogl_gles2_wrapper_bind_texture (GLenum target, GLuint texture,
-				 GLenum internal_format)
-{
-  _COGL_GET_GLES2_WRAPPER (w, NO_RETVAL);
-
-  glBindTexture (target, texture);
-
-  /* We need to keep track of whether the texture is alpha-only
-     because the emulation of GL_MODULATE needs to work differently in
-     that case */
-  if (COGL_GLES2_TEXTURE_UNIT_IS_ALPHA_ONLY (w->settings.texture_units,
-                                             w->active_texture_unit)
-      != (internal_format == GL_ALPHA))
-    {
-      COGL_GLES2_TEXTURE_UNIT_SET_ALPHA_ONLY (w->settings.texture_units,
-                                              w->active_texture_unit,
-                                              internal_format == GL_ALPHA);
-      w->settings_dirty = TRUE;
-    }
-}
-
 void
 cogl_wrap_glTexEnvi (GLenum target, GLenum pname, GLint param)
 {

cogl/driver/gles/cogl-gles2-wrapper.h

@@ -55,14 +55,10 @@ typedef struct _CoglGles2WrapperShader	  CoglGles2WrapperShader;
 /* Accessors for the texture unit bit mask */
 #define COGL_GLES2_TEXTURE_UNIT_IS_ENABLED(mask, unit)  \
   (((mask) & (1 << ((unit) * 2))) ? TRUE : FALSE)
-#define COGL_GLES2_TEXTURE_UNIT_IS_ALPHA_ONLY(mask, unit)       \
-  (((mask) & (1 << ((unit) * 2 + 1))) ? TRUE : FALSE)
 #define COGL_GLES2_SET_BIT(mask, bit, val)                              \
   ((val) ? ((mask) |= (1 << (bit))) : ((mask) &= ~(1 << (bit))))
 #define COGL_GLES2_TEXTURE_UNIT_SET_ENABLED(mask, unit, val)    \
   COGL_GLES2_SET_BIT ((mask), (unit) * 2, (val))
-#define COGL_GLES2_TEXTURE_UNIT_SET_ALPHA_ONLY(mask, unit, val) \
-  COGL_GLES2_SET_BIT ((mask), (unit) * 2 + 1, (val))
 
 #define COGL_GLES2_MAX_TEXTURE_UNITS (sizeof (guint32) * 8 / 2)
 
@@ -379,9 +375,6 @@ void cogl_wrap_glDrawElements (GLenum mode, GLsizei count, GLenum type,
                                const GLvoid *indices);
 void cogl_wrap_glTexParameteri (GLenum target, GLenum pname, GLfloat param);
 
-void cogl_gles2_wrapper_bind_texture (GLenum target, GLuint texture,
-				      GLenum internal_format);
-
 void cogl_wrap_glMaterialfv (GLenum face, GLenum pname, const GLfloat *params);
 
 /* This function is only available on GLES 2 */
@@ -430,11 +423,6 @@ void _cogl_gles2_clear_cache_for_program (CoglHandle program);
 
 #else /* HAVE_COGL_GLES2 */
 
-/* The extra third parameter of the bind texture wrapper isn't needed
-   so we can just directly call glBindTexture */
-#define cogl_gles2_wrapper_bind_texture(target, texture, internal_format) \
-  glBindTexture ((target), (texture))
-
 /* COGL uses the automatic mipmap generation for GLES 1 so
    glGenerateMipmap doesn't need to do anything */
 #define cogl_wrap_glGenerateMipmap(x) ((void) 0)

cogl/driver/gles/cogl-texture-driver.c

@@ -74,15 +74,6 @@ _cogl_texture_driver_gen (GLenum   gl_target,
     }
 }
 
-
-void
-_cogl_texture_driver_bind (GLenum gl_target,
-                           GLuint gl_handle,
-                           GLenum gl_intformat)
-{
-  GE (cogl_gles2_wrapper_bind_texture (gl_target, gl_handle, gl_intformat));
-}
-
 void
 _cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
                                                 int pixels_bpp)
@@ -140,8 +131,6 @@ _cogl_texture_driver_upload_subregion_to_gl (GLenum       gl_target,
                                slice_bmp.width,
                                slice_bmp.height);
 
-  /* We don't need to use _cogl_texture_driver_bind here because we're
-     not using the bound texture to render yet */
   GE( glBindTexture (gl_target, gl_handle) );
 
   GE( glTexSubImage2D (gl_target, 0,
@@ -186,8 +175,6 @@ _cogl_texture_driver_upload_to_gl (GLenum       gl_target,
   _cogl_texture_driver_prep_gl_for_pixels_upload (bmp.rowstride,
                                                   bpp);
 
-  /* We don't need to use _cogl_texture_driver_bind here because we're
-     not using the bound texture to render yet */
   GE( glBindTexture (gl_target, gl_handle) );
 
   GE( glTexImage2D (gl_target, 0,