Updates GLES1 support for CoglMaterial

This updates cogl/gles in line with the integration of CoglMaterial throughout
Cogl that has been done for cogl/gl.

Note: This is still buggy, but at least it builds again and test-actors works.
Some GLES2 specific changes were made, but these haven't been tested yet.

common/cogl-material.c

@@ -886,8 +886,12 @@ _cogl_material_flush_layers_gl_state (CoglMaterial *material,
         _cogl_material_layer_pointer_from_handle (layer_handle);
       CoglLayerInfo     *gl_layer_info = NULL;
       CoglLayerInfo      new_gl_layer_info;
+      CoglHandle         tex_handle;
       GLuint             gl_texture;
       GLenum             gl_target;
+#ifdef HAVE_COGL_GLES2
+      GLenum             gl_internal_format;
+#endif
 
       new_gl_layer_info.layer0_overridden =
         layer0_override_texture ? TRUE : FALSE;
@@ -912,18 +916,19 @@ _cogl_material_flush_layers_gl_state (CoglMaterial *material,
             continue;
         }
 
-      cogl_texture_get_gl_texture (layer->texture, &gl_texture, &gl_target);
+      tex_handle = layer->texture;
+      cogl_texture_get_gl_texture (tex_handle, &gl_texture, &gl_target);
 
       if (new_gl_layer_info.layer0_overridden)
         gl_texture = layer0_override_texture;
       else if (new_gl_layer_info.fallback)
         {
-          CoglHandle tex_handle;
-
           if (gl_target == GL_TEXTURE_2D)
             tex_handle = ctx->default_gl_texture_2d_tex;
+#ifdef HAVE_COGL_GL
           else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
             tex_handle = ctx->default_gl_texture_rect_tex;
+#endif
           else
             {
               g_warning ("We don't have a default texture we can use to fill "
@@ -935,12 +940,28 @@ _cogl_material_flush_layers_gl_state (CoglMaterial *material,
           cogl_texture_get_gl_texture (tex_handle, &gl_texture, NULL);
         }
 
+#ifdef HAVE_COGL_GLES2
+      {
+        CoglTexture *tex =
+          _cogl_texture_pointer_from_handle (tex_handle);
+        gl_internal_format = tex->gl_intformat;
+      }
+#endif
+
       GE (glActiveTexture (GL_TEXTURE0 + i));
 
       if (!gl_layer_info
           || gl_layer_info->gl_target != gl_target
           || gl_layer_info->gl_texture != gl_texture)
+        {
+#ifdef HAVE_COGL_GLES2
+          cogl_gles2_wrapper_bind_texture (gl_target,
+                                           gl_texture,
+                                           gl_internal_format);
+#else
           GE (glBindTexture (gl_target, gl_texture));
+#endif
+        }
 
       /* Disable the previous target if it was different */
       if (gl_layer_info &&
@@ -1007,7 +1028,11 @@ _cogl_material_flush_base_gl_state (CoglMaterial *material)
   if (!(ctx->current_material_flags & COGL_MATERIAL_FLAG_DEFAULT_COLOR
         && material->flags & COGL_MATERIAL_FLAG_DEFAULT_COLOR))
     {
-      GE (glColor4fv (material->unlit));
+      /* GLES doesn't have glColor4fv... */
+      GE (glColor4f (material->unlit[0],
+                     material->unlit[1],
+                     material->unlit[2],
+                     material->unlit[3]));
     }
 
   if (!(ctx->current_material_flags & COGL_MATERIAL_FLAG_DEFAULT_GL_MATERIAL

gl/cogl-texture.c

@@ -51,6 +51,13 @@
     printf("err: 0x%x\n", err); \
 } */
 
+#ifdef HAVE_COGL_GL
+#ifdef glDrawRangeElements
+#undef glDrawRangeElements
+#endif
+#define glDrawRangeElements ctx->pf_glDrawRangeElements
+#endif
+
 static void _cogl_journal_flush (void);
 
 static void _cogl_texture_free (CoglTexture *tex);
@@ -2970,6 +2977,16 @@ cogl_polygon (CoglTextureVertex *vertices,
 
       if (i == 0 && cogl_texture_is_sliced (tex_handle))
         {
+#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GLES2)
+          {
+            static gboolean shown_gles_slicing_warning = FALSE;
+            if (!shown_gles_slicing_warning)
+              g_warning ("cogl_polygon does not work for sliced textures "
+                         "on GL ES");
+            shown_gles_slicing_warning = TRUE;
+            return;
+          }
+#endif
           if (n_layers > 1)
             {
               static gboolean shown_slicing_warning = FALSE;

gles/cogl-context.c

@@ -28,20 +28,24 @@
 #endif
 
 #include "cogl.h"
-
-#include <string.h>
-
 #include "cogl-internal.h"
 #include "cogl-util.h"
 #include "cogl-context.h"
+#include "cogl-texture-private.h"
+#include "cogl-material-private.h"
 
 #include "cogl-gles2-wrapper.h"
 
+#include <string.h>
+
 static CoglContext *_context = NULL;
 
 gboolean
 cogl_create_context ()
 {
+  GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
+  gulong  enable_flags = 0;
+
   if (_context != NULL)
     return FALSE;
 
@@ -55,42 +59,77 @@ cogl_create_context ()
   _context->enable_flags = 0;
   _context->color_alpha = 255;
 
-  _context->path_nodes = g_array_new (FALSE, FALSE, sizeof (CoglPathNode));
-  _context->last_path = 0;
-
-  _context->texture_handles = NULL;
-  _context->texture_vertices = g_array_new (FALSE, FALSE,
-                                            sizeof (CoglTextureGLVertex));
-  _context->texture_indices = g_array_new (FALSE, FALSE,
-                                           sizeof (GLushort));
-
   _context->material_handles = NULL;
   _context->material_layer_handles = NULL;
-  _context->source_material = COGL_INVALID_HANDLE;
+  _context->default_material = cogl_material_new ();
+  _context->source_material = NULL;
+
+  _context->texture_handles = NULL;
+  _context->default_gl_texture_2d_tex = COGL_INVALID_HANDLE;
+  _context->default_gl_texture_rect_tex = COGL_INVALID_HANDLE;
+  _context->texture_download_material = COGL_INVALID_HANDLE;
+
+  _context->journal = g_array_new (FALSE, FALSE, sizeof (CoglJournalEntry));
+  _context->logged_vertices = g_array_new (FALSE, FALSE, sizeof (GLfloat));
+  _context->static_indices = g_array_new (FALSE, FALSE, sizeof (GLushort));
+  _context->polygon_vertices = g_array_new (FALSE, FALSE,
+                                            sizeof (CoglTextureGLVertex));
+
+  _context->current_material = NULL;
+  _context->current_material_flags = 0;
+  _context->current_layers = g_array_new (FALSE, FALSE,
+                                          sizeof (CoglLayerInfo));
+  _context->n_texcoord_arrays_enabled = 0;
 
   _context->fbo_handles = NULL;
-  _context->program_handles = NULL;
-  _context->shader_handles = NULL;
   _context->draw_buffer = COGL_WINDOW_BUFFER;
 
+  _context->shader_handles = NULL;
+
+  _context->program_handles = NULL;
+
   _context->vertex_buffer_handles = NULL;
 
-  _context->blend_src_factor = CGL_SRC_ALPHA;
+  _context->path_nodes = g_array_new (FALSE, FALSE, sizeof (CoglPathNode));
-  _context->blend_dst_factor = CGL_ONE_MINUS_SRC_ALPHA;
+  _context->last_path = 0;
+  _context->stencil_material = cogl_material_new ();
 
   /* Init the GLES2 wrapper */
 #ifdef HAVE_COGL_GLES2
   cogl_gles2_wrapper_init (&_context->gles2);
 #endif
 
-  /* Init OpenGL state */
+  /* Initialise the clip stack */
-  GE( glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE) );
-  GE( glColorMask (TRUE, TRUE, TRUE, FALSE) );
-  GE( glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) );
-  cogl_enable (0);
-
   _cogl_clip_stack_state_init ();
 
+  /* Create default textures used for fall backs */
+  _context->default_gl_texture_2d_tex =
+    cogl_texture_new_from_data (1, /* width */
+                                1, /* height */
+                                -1, /* max waste */
+                                FALSE, /* auto mipmap */
+                                COGL_PIXEL_FORMAT_RGBA_8888, /* data format */
+                                /* internal format */
+                                COGL_PIXEL_FORMAT_RGBA_8888,
+                                0, /* auto calc row stride */
+                                &default_texture_data);
+  _context->default_gl_texture_rect_tex =
+    cogl_texture_new_from_data (1, /* width */
+                                1, /* height */
+                                -1, /* max waste */
+                                FALSE, /* auto mipmap */
+                                COGL_PIXEL_FORMAT_RGBA_8888, /* data format */
+                                /* internal format */
+                                COGL_PIXEL_FORMAT_RGBA_8888,
+                                0, /* auto calc row stride */
+                                &default_texture_data);
+
+  cogl_set_source (_context->default_material);
+  cogl_material_flush_gl_state (_context->source_material, NULL);
+  enable_flags =
+    cogl_material_get_cogl_enable_flags (_context->source_material);
+  cogl_enable (enable_flags);
+
   return TRUE;
 }
 
@@ -105,15 +144,6 @@ cogl_destroy_context ()
   if (_context->path_nodes)
     g_array_free (_context->path_nodes, TRUE);
 
-#ifdef HAVE_COGL_GLES2
-  cogl_gles2_wrapper_deinit (&_context->gles2);
-#endif
-
-  if (_context->texture_vertices)
-    g_array_free (_context->texture_vertices, TRUE);
-  if (_context->texture_indices)
-    g_array_free (_context->texture_indices, TRUE);
-
   if (_context->texture_handles)
     g_array_free (_context->texture_handles, TRUE);
   if (_context->fbo_handles)
@@ -123,13 +153,33 @@ cogl_destroy_context ()
   if (_context->program_handles)
     g_array_free (_context->program_handles, TRUE);
 
+  if (_context->default_gl_texture_2d_tex)
+    cogl_texture_unref (_context->default_gl_texture_2d_tex);
+  if (_context->default_gl_texture_rect_tex)
+    cogl_texture_unref (_context->default_gl_texture_rect_tex);
+
+  if (_context->default_material)
+    cogl_material_unref (_context->default_material);
+
+  if (_context->journal)
+    g_array_free (_context->journal, TRUE);
+  if (_context->logged_vertices)
+    g_array_free (_context->logged_vertices, TRUE);
+
+  if (_context->static_indices)
+    g_array_free (_context->static_indices, TRUE);
+  if (_context->polygon_vertices)
+    g_array_free (_context->polygon_vertices, TRUE);
+  if (_context->current_layers)
+    g_array_free (_context->current_layers, TRUE);
+
   g_free (_context);
 }
 
 CoglContext *
 _cogl_context_get_default ()
 {
-  /* Create if doesn't exists yet */
+  /* Create if doesn't exist yet */
   if (_context == NULL)
     cogl_create_context ();
 

gles/cogl-context.h

@@ -47,11 +47,55 @@ typedef struct
   /* Enable cache */
   gulong            enable_flags;
   guint8            color_alpha;
-  COGLenum             blend_src_factor;
-  COGLenum             blend_dst_factor;
 
   gboolean          enable_backface_culling;
 
+  /* Cache of inverse projection matrix */
+  float            inverse_projection[16];
+
+  /* Materials */
+  GArray           *material_handles;
+  GArray           *material_layer_handles;
+  CoglHandle        default_material;
+  CoglHandle	    source_material;
+
+  /* Textures */
+  GArray	   *texture_handles;
+  CoglHandle        default_gl_texture_2d_tex;
+  CoglHandle        default_gl_texture_rect_tex;
+  CoglHandle        texture_download_material;
+
+  /* Batching geometry... */
+  /* We journal the texture rectangles we want to submit to OpenGL so
+   * we have an oppertunity to optimise the final order so that we
+   * can batch things together. */
+  GArray           *journal;
+  GArray           *logged_vertices;
+  GArray           *static_indices;
+  GArray           *polygon_vertices;
+
+  /* Some simple caching, to minimize state changes... */
+  CoglHandle	    current_material;
+  gulong            current_material_flags;
+  GArray           *current_layers;
+  guint             n_texcoord_arrays_enabled;
+
+  /* Framebuffer objects */
+  GArray           *fbo_handles;
+  CoglBufferTarget  draw_buffer;
+
+  /* Shaders */
+  GArray           *shader_handles;
+
+  /* Programs */
+  GArray           *program_handles;
+
+  /* Clip stack */
+  CoglClipStackState clip;
+
+  /* Vertex buffers */
+  GArray           *vertex_buffer_handles;
+
   /* Primitives */
   floatVec2         path_start;
   floatVec2         path_pen;
@@ -59,39 +103,7 @@ typedef struct
   guint             last_path;
   floatVec2         path_nodes_min;
   floatVec2         path_nodes_max;
-  
+  CoglHandle        stencil_material;
-  /* Cache of inverse projection matrix */
-  float            inverse_projection[16];
-
-  /* Textures */
-  GArray              *texture_handles;
-  GArray              *texture_vertices;
-  GArray              *texture_indices;
-  /* The gl texture number that the above vertices apply to. This to
-     detect when a different slice is encountered so that the vertices
-     can be flushed */
-  GLuint               texture_current;
-  GLenum               texture_target;
-  GLenum               texture_format;
-
-  /* Materials */
-  GArray	      *material_handles;
-  GArray	      *material_layer_handles;
-  CoglHandle	       source_material;
-
-  /* Framebuffer objects */
-  GArray              *fbo_handles;
-  CoglBufferTarget     draw_buffer;
-
-  /* Shaders */
-  GArray              *program_handles;
-  GArray              *shader_handles;
-
-  /* Vertex buffers */
-  GArray              *vertex_buffer_handles;
-
-  /* Clip stack */
-  CoglClipStackState   clip;
 
 #ifdef HAVE_COGL_GLES2
   CoglGles2Wrapper     gles2;

gles/cogl-gles2-wrapper.h

@@ -369,6 +369,11 @@ void _cogl_gles2_clear_cache_for_program (CoglHandle program);
    glGenerateMipmap doesn't need to do anything */
 #define cogl_wrap_glGenerateMipmap(x) ((void) 0)
 
+/* GLES doesn't have glDrawRangeElements, so we simply pretend it does
+ * but that it makes no use of the start, end constraints: */
+#define glDrawRangeElements(mode, start, end, count, type, indices) \
+  glDrawElements (mode, count, type, indices)
+
 #endif /* HAVE_COGL_GLES2 */
 
 G_END_DECLS

gles/cogl-internal.h

@@ -75,13 +75,10 @@ const char *_cogl_error_string(GLenum errorCode);
 #endif /* COGL_DEBUG */
 
 #define COGL_ENABLE_BLEND             (1<<1)
-#define COGL_ENABLE_TEXTURE_2D        (1<<2)
+#define COGL_ENABLE_ALPHA_TEST        (1<<2)
-#define COGL_ENABLE_ALPHA_TEST        (1<<3)
+#define COGL_ENABLE_VERTEX_ARRAY      (1<<3)
-#define COGL_ENABLE_TEXTURE_RECT      (1<<4)
+#define COGL_ENABLE_COLOR_ARRAY       (1<<4)
-#define COGL_ENABLE_VERTEX_ARRAY      (1<<5)
+#define COGL_ENABLE_BACKFACE_CULLING  (1<<5)
-#define COGL_ENABLE_TEXCOORD_ARRAY    (1<<6)
-#define COGL_ENABLE_COLOR_ARRAY       (1<<7)
-#define COGL_ENABLE_BACKFACE_CULLING  (1<<8)
 
 gint
 _cogl_get_format_bpp (CoglPixelFormat format);

gles/cogl-primitives.c

@@ -38,27 +38,6 @@
 
 #define _COGL_MAX_BEZ_RECURSE_DEPTH 16
 
-void
-_cogl_rectangle (float x,
-                 float y,
-                 float width,
-                 float height)
-{
-  GLfloat rect_verts[8] = {
-    (GLfloat)  x,          (GLfloat)  y,
-    (GLfloat) (x + width), (GLfloat)  y,
-    (GLfloat)  x,          (GLfloat) (y + height),
-    (GLfloat) (x + width), (GLfloat) (y + height)
-  };
-
-  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
-  
-  cogl_enable (COGL_ENABLE_VERTEX_ARRAY
-              | (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0));
-  GE ( glVertexPointer (2, GL_FLOAT, 0, rect_verts ) );
-  GE ( glDrawArrays (GL_TRIANGLE_STRIP, 0, 4) );
-}
-
 void
 _cogl_path_add_node (gboolean new_sub_path,
 		     float x,
@@ -97,19 +76,24 @@ void
 _cogl_path_stroke_nodes ()
 {
   guint   path_start = 0;
+  gulong  enable_flags = COGL_ENABLE_VERTEX_ARRAY;
 
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
-  cogl_enable (COGL_ENABLE_VERTEX_ARRAY
+  enable_flags |= cogl_material_get_cogl_enable_flags (ctx->source_material);
-	       | (ctx->color_alpha < 255
+  cogl_enable (enable_flags);
-		  ? COGL_ENABLE_BLEND : 0));
+
+  cogl_material_flush_gl_state (ctx->source_material,
+                                COGL_MATERIAL_FLUSH_DISABLE_MASK,
+                                (guint32)~0, /* disable all texture layers */
+                                NULL);
 
   while (path_start < ctx->path_nodes->len)
     {
       CoglPathNode *path = &g_array_index (ctx->path_nodes, CoglPathNode,
                                            path_start);
 
-      GE( glVertexPointer (2, GL_FIXED, sizeof (CoglPathNode),
+      GE( glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode),
                            (guchar *) path
                            + G_STRUCT_OFFSET (CoglPathNode, x)) );
       GE( glDrawArrays (GL_LINE_STRIP, 0, path->path_size) );
@@ -151,6 +135,16 @@ _cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
   float   bounds_y;
   float   bounds_w;
   float   bounds_h;
+  gulong  enable_flags = COGL_ENABLE_VERTEX_ARRAY;
+
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
+  /* Just setup a simple material that doesn't use texturing... */
+  cogl_material_flush_gl_state (ctx->stencil_material, NULL);
+
+  enable_flags |=
+    cogl_material_get_cogl_enable_flags (ctx->source_material);
+  cogl_enable (enable_flags);
 
   _cogl_path_get_bounds (nodes_min, nodes_max,
                          &bounds_x, &bounds_y, &bounds_w, &bounds_h);
@@ -175,9 +169,7 @@ _cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
 
   while (path_start < path_size)
     {
-      cogl_enable (COGL_ENABLE_VERTEX_ARRAY);
+      GE( glVertexPointer (2, GL_FLOAT, sizeof (CoglPathNode),
-
-      GE( glVertexPointer (2, GL_FIXED, sizeof (CoglPathNode),
                            (guchar *) path
                            + G_STRUCT_OFFSET (CoglPathNode, x)) );
       GE( glDrawArrays (GL_TRIANGLE_FAN, 0, path->path_size) );
@@ -444,4 +436,3 @@ _cogl_path_fill_nodes ()
         }
     }
 }
-

gles/cogl-texture-private.h

@@ -31,8 +31,6 @@
 typedef struct _CoglTexture       CoglTexture;
 typedef struct _CoglTexSliceSpan  CoglTexSliceSpan;
 typedef struct _CoglSpanIter      CoglSpanIter;
-typedef struct _CoglMultiTexture      CoglMultiTexture;
-typedef struct _CoglMultiTextureLayer CoglMultiTextureLayer;
 
 struct _CoglTexSliceSpan
 {
@@ -61,26 +59,23 @@ struct _CoglTexture
   gboolean           auto_mipmap;
 };
 
-struct _CoglMultiTextureLayer
+/* To improve batching of geometry when submitting vertices to OpenGL we
+ * log the texture rectangles we want to draw to a journal, so when we
+ * later flush the journal we aim to batch data, and gl draw calls. */
+typedef struct _CoglJournalEntry
 {
-  guint	       ref_count;
+  CoglHandle     material;
-  guint	       index;	/*!< lowest index is blended first then others
+  gint           n_layers;
-			     on top */
+  guint32        fallback_mask;
-  CoglTexture *tex;	/*!< The texture for this layer, or NULL
+  GLuint         layer0_override_texture;
-			     for an empty layer */
+} CoglJournalEntry;
-
-  /* TODO: Add more control over the texture environment for each texture
-   * unit. For example we should support dot3 normal mapping. */
-};
-
-struct _CoglMultiTexture
-{
-  guint	   ref_count;
-  GList	  *layers;
-};
 
 CoglTexture*
 _cogl_texture_pointer_from_handle (CoglHandle handle);
 
-#endif /* __COGL_TEXTURE_H */
+gboolean
+_cogl_texture_span_has_waste (CoglTexture *tex,
+                              gint x_span_index,
+                              gint y_span_index);
 
+#endif /* __COGL_TEXTURE_H */

gles/cogl.c

@@ -92,10 +92,10 @@ cogl_paint_init (const CoglColor *color)
   fprintf(stderr, "\n ============== Paint Start ================ \n");
 #endif
 
-  glClearColor (cogl_color_get_red (color),
+  GE( glClearColor (cogl_color_get_red_float (color),
-                cogl_color_get_green (color),
+                    cogl_color_get_green_float (color),
-                cogl_color_get_blue (color),
+                    cogl_color_get_blue_float (color),
-                0);
+                    0.0) );
 
   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
   glDisable (GL_LIGHTING);
@@ -213,10 +213,6 @@ cogl_enable (gulong flags)
                     COGL_ENABLE_BLEND,
                     GL_BLEND);
 
-  cogl_toggle_flag (ctx, flags,
-		    COGL_ENABLE_TEXTURE_2D,
-		    GL_TEXTURE_2D);
-
   cogl_toggle_flag (ctx, flags,
                     COGL_ENABLE_BACKFACE_CULLING,
                     GL_CULL_FACE);
@@ -225,10 +221,6 @@ cogl_enable (gulong flags)
 			   COGL_ENABLE_VERTEX_ARRAY,
 			   GL_VERTEX_ARRAY);
 
-  cogl_toggle_client_flag (ctx, flags,
-			   COGL_ENABLE_TEXCOORD_ARRAY,
-			   GL_TEXTURE_COORD_ARRAY);
-
   cogl_toggle_client_flag (ctx, flags,
 			   COGL_ENABLE_COLOR_ARRAY,
 			   GL_COLOR_ARRAY);
@@ -272,34 +264,11 @@ cogl_set_source_color (const CoglColor *color)
 {
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
-#if 0 /*HAVE_GLES_COLOR4UB*/
+  /* In case cogl_set_source_texture was previously used... */
+  cogl_material_remove_layer (ctx->default_material, 0);
 
-  /* NOTE: seems SDK_OGLES-1.1_LINUX_PCEMULATION_2.02.22.0756 has this call
+  cogl_material_set_color (ctx->default_material, color);
-   * but is broken - see #857. Therefor disabling.
+  cogl_set_source (ctx->default_material);
-  */
-
-  /*
-   * GLES 1.1 does actually have this function, it's in the header file but
-   * missing in the reference manual (and SDK):
-   *
-   * http://www.khronos.org/egl/headers/1_1/gl.h
-   */
-  GE( glColor4ub (color->red,
-		  color->green,
-		  color->blue,
-		  color->alpha) );
-
-
-#else
-  /* conversion can cause issues with picking on some gles implementations */
-  GE( glColor4f (cogl_color_get_red (color),
-                           cogl_color_get_green (color),
-                           cogl_color_get_blue (color),
-                           cogl_color_get_alpha (color)) );
-#endif
-
-  /* Store alpha for proper blending enables */
-  ctx->color_alpha = cogl_color_get_alpha_byte (color);
 }
 
 static void
@@ -421,6 +390,8 @@ _cogl_add_stencil_clip (float x_offset,
 {
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
+  cogl_material_flush_gl_state (ctx->stencil_material);
+
   if (first)
     {
       GE( glEnable (GL_STENCIL_TEST) );