cogl: Support multiple fallbacks in cogl_offscreen_new_to_texture()
The Intel drivers in Mesa 7.6 (and possibly earlier versions) don't support creating FBOs with a stencil buffer but without a depth buffer. This reworks framebuffer allocation so that we try a number of fallback options before failing. The options we try in order are: - the same options that were sucessful last time if available - combined depth and stencil - separate depth and stencil - just stencil, no depth - just depth, no stencil - neither depth or stencil
This commit is contained in:
Robert Bragg
parent
05ce533fc8
commit
9690913fef
2 changed files with 158 additions and 86 deletions
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@ -56,7 +56,7 @@ typedef struct _CoglOffscreen
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{
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CoglFramebuffer _parent;
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GLuint fbo_handle;
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GLuint gl_stencil_handle;
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GSList *renderbuffers;
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CoglHandle texture;
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} CoglOffscreen;
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@ -71,6 +71,15 @@
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#ifndef GL_STENCIL_INDEX8
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#define GL_STENCIL_INDEX8 0x8D48
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#endif
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#ifndef GL_DEPTH_STENCIL
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#define GL_DEPTH_STENCIL 0x84F9
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#endif
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typedef enum {
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_TRY_DEPTH_STENCIL = 1L<<0,
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_TRY_DEPTH = 1L<<1,
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_TRY_STENCIL = 1L<<2
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} TryFBOFlags;
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static void _cogl_framebuffer_free (CoglFramebuffer *framebuffer);
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static void _cogl_onscreen_free (CoglOnscreen *onscreen);
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@ -232,17 +241,123 @@ _cogl_framebuffer_get_projection_stack (CoglHandle handle)
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return framebuffer->projection_stack;
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}
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static TryFBOFlags
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try_creating_fbo (CoglOffscreen *offscreen,
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TryFBOFlags flags,
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CoglHandle texture)
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{
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GLuint gl_depth_stencil_handle;
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GLuint gl_depth_handle;
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GLuint gl_stencil_handle;
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GLuint tex_gl_handle;
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GLenum tex_gl_target;
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GLuint fbo_gl_handle;
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GLenum status;
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_COGL_GET_CONTEXT (ctx, FALSE);
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if (!cogl_texture_get_gl_texture (texture, &tex_gl_handle, &tex_gl_target))
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return 0;
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if (tex_gl_target != GL_TEXTURE_2D
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#ifdef HAVE_COGL_GL
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&& tex_gl_target != GL_TEXTURE_RECTANGLE_ARB
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#endif
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)
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return 0;
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/* We are about to generate and bind a new fbo, so when next flushing the
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* journal, we will need to rebind the current framebuffer... */
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ctx->dirty_bound_framebuffer = 1;
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/* Generate framebuffer */
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glGenFramebuffers (1, &fbo_gl_handle);
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GE (glBindFramebuffer (GL_FRAMEBUFFER, fbo_gl_handle));
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offscreen->fbo_handle = fbo_gl_handle;
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GE (glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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tex_gl_target, tex_gl_handle, 0));
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if (flags & _TRY_DEPTH_STENCIL)
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{
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/* Create a renderbuffer for depth and stenciling */
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GE (glGenRenderbuffers (1, &gl_depth_stencil_handle));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, gl_depth_stencil_handle));
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GE (glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH_STENCIL,
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cogl_texture_get_width (texture),
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cogl_texture_get_height (texture)));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, 0));
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_STENCIL_ATTACHMENT,
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GL_RENDERBUFFER, gl_depth_stencil_handle));
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_DEPTH_ATTACHMENT,
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GL_RENDERBUFFER, gl_depth_stencil_handle));
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offscreen->renderbuffers =
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g_slist_prepend (offscreen->renderbuffers,
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GUINT_TO_POINTER (gl_depth_stencil_handle));
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}
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if (flags & _TRY_DEPTH)
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{
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GE (glGenRenderbuffers (1, &gl_depth_handle));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, gl_depth_handle));
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/* For now we just ask for GL_DEPTH_COMPONENT16 since this is all that's
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* available under GLES */
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GE (glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
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cogl_texture_get_width (texture),
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cogl_texture_get_height (texture)));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, 0));
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_DEPTH_ATTACHMENT,
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GL_RENDERBUFFER, gl_depth_handle));
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offscreen->renderbuffers =
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g_slist_prepend (offscreen->renderbuffers,
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GUINT_TO_POINTER (gl_depth_handle));
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}
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if (flags & _TRY_STENCIL)
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{
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GE (glGenRenderbuffers (1, &gl_stencil_handle));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, gl_stencil_handle));
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GE (glRenderbufferStorage (GL_RENDERBUFFER, GL_STENCIL_INDEX8,
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cogl_texture_get_width (texture),
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cogl_texture_get_height (texture)));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, 0));
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_STENCIL_ATTACHMENT,
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GL_RENDERBUFFER, gl_stencil_handle));
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offscreen->renderbuffers =
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g_slist_prepend (offscreen->renderbuffers,
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GUINT_TO_POINTER (gl_stencil_handle));
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}
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/* Make sure it's complete */
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status = glCheckFramebufferStatus (GL_FRAMEBUFFER);
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if (status != GL_FRAMEBUFFER_COMPLETE)
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{
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GSList *l;
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GE (glDeleteFramebuffers (1, &fbo_gl_handle));
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for (l = offscreen->renderbuffers; l; l = l->next)
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{
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GLuint renderbuffer = GPOINTER_TO_UINT (l->data);
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GE (glDeleteRenderbuffers (1, &renderbuffer));
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}
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return 0;
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}
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return flags;
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}
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CoglHandle
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cogl_offscreen_new_to_texture (CoglHandle texhandle)
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{
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CoglOffscreen *offscreen;
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int width;
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int height;
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GLuint tex_gl_handle;
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GLenum tex_gl_target;
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GLuint fbo_gl_handle;
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GLuint gl_stencil_handle;
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GLenum status;
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CoglOffscreen *offscreen;
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TryFBOFlags flags;
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static TryFBOFlags last_working_flags = 0;
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_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
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@ -257,42 +372,6 @@ cogl_offscreen_new_to_texture (CoglHandle texhandle)
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if (cogl_texture_is_sliced (texhandle))
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return COGL_INVALID_HANDLE;
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/* Pick the single texture slice width, height and GL id */
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width = cogl_texture_get_width (texhandle);
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height = cogl_texture_get_height (texhandle);
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if (!cogl_texture_get_gl_texture (texhandle, &tex_gl_handle, &tex_gl_target))
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return COGL_INVALID_HANDLE;
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if (tex_gl_target != GL_TEXTURE_2D
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#ifdef HAVE_COGL_GL
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&& tex_gl_target != GL_TEXTURE_RECTANGLE_ARB
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#endif
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)
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return COGL_INVALID_HANDLE;
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/* Create a renderbuffer for stenciling */
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GE (glGenRenderbuffers (1, &gl_stencil_handle));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, gl_stencil_handle));
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GE (glRenderbufferStorage (GL_RENDERBUFFER, GL_STENCIL_INDEX8,
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cogl_texture_get_width (texhandle),
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cogl_texture_get_height (texhandle)));
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GE (glBindRenderbuffer (GL_RENDERBUFFER, 0));
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/* We are about to generate and bind a new fbo, so when next flushing the
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* journal, we will need to rebind the current framebuffer... */
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ctx->dirty_bound_framebuffer = 1;
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/* Generate framebuffer */
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glGenFramebuffers (1, &fbo_gl_handle);
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GE (glBindFramebuffer (GL_FRAMEBUFFER, fbo_gl_handle));
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GE (glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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tex_gl_target, tex_gl_handle, 0));
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_STENCIL_ATTACHMENT,
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GL_RENDERBUFFER, gl_stencil_handle));
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/* XXX: The framebuffer_object spec isn't clear in defining whether attaching
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* a texture as a renderbuffer with mipmap filtering enabled while the
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* mipmaps have not been uploaded should result in an incomplete framebuffer
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@ -305,50 +384,34 @@ cogl_offscreen_new_to_texture (CoglHandle texhandle)
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*/
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_cogl_texture_set_filters (texhandle, GL_NEAREST, GL_NEAREST);
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/* Make sure it's complete */
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status = glCheckFramebufferStatus (GL_FRAMEBUFFER);
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offscreen = g_new0 (CoglOffscreen, 1);
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offscreen->texture = cogl_handle_ref (texhandle);
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if (status != GL_FRAMEBUFFER_COMPLETE)
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if (!(last_working_flags &&
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(flags = try_creating_fbo (offscreen, last_working_flags,
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texhandle))) &&
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!(flags = try_creating_fbo (offscreen, _TRY_DEPTH_STENCIL,
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texhandle)) &&
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!(flags = try_creating_fbo (offscreen, _TRY_DEPTH | _TRY_STENCIL,
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texhandle)) &&
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!(flags = try_creating_fbo (offscreen, _TRY_STENCIL, texhandle)) &&
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!(flags = try_creating_fbo (offscreen, _TRY_DEPTH, texhandle)) &&
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!(flags = try_creating_fbo (offscreen, 0, texhandle)))
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{
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/* Stencil renderbuffers aren't always supported. Try again
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without the stencil buffer */
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GE (glFramebufferRenderbuffer (GL_FRAMEBUFFER,
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GL_STENCIL_ATTACHMENT,
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GL_RENDERBUFFER,
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0));
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GE (glDeleteRenderbuffers (1, &gl_stencil_handle));
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gl_stencil_handle = 0;
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status = glCheckFramebufferStatus (GL_FRAMEBUFFER);
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if (status != GL_FRAMEBUFFER_COMPLETE)
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{
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/* Still failing, so give up */
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GE (glDeleteFramebuffers (1, &fbo_gl_handle));
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GE (glBindFramebuffer (GL_FRAMEBUFFER, 0));
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return COGL_INVALID_HANDLE;
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}
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g_free (offscreen);
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last_working_flags = 0;
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/* XXX: This API should probably have been defined to take a GError */
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g_warning ("%s: Failed to create an OpenGL framebuffer", G_STRLOC);
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return COGL_INVALID_HANDLE;
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}
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offscreen = g_new0 (CoglOffscreen, 1);
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/* Save the final set of flags that worked so we can hopefully construct
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* subsequent buffers faster. */
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last_working_flags = flags;
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_cogl_framebuffer_init (COGL_FRAMEBUFFER (offscreen),
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COGL_FRAMEBUFFER_TYPE_OFFSCREEN,
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width,
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height);
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offscreen->fbo_handle = fbo_gl_handle;
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offscreen->gl_stencil_handle = gl_stencil_handle;
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offscreen->texture = cogl_handle_ref (texhandle);
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/* XXX: Can we get a away with removing this? It wasn't documented, and most
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* users of the API are hopefully setting up the modelview from scratch
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* anyway */
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#if 0
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cogl_matrix_translate (&framebuffer->modelview, -1.0f, -1.0f, 0.0f);
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cogl_matrix_scale (&framebuffer->modelview,
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2.0f / framebuffer->width, 2.0f / framebuffer->height, 1.0f);
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#endif
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cogl_texture_get_width (texhandle),
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cogl_texture_get_height (texhandle));
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return _cogl_offscreen_handle_new (offscreen);
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}
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@ -356,16 +419,25 @@ cogl_offscreen_new_to_texture (CoglHandle texhandle)
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static void
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_cogl_offscreen_free (CoglOffscreen *offscreen)
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{
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GSList *l;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Chain up to parent */
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_cogl_framebuffer_free (COGL_FRAMEBUFFER (offscreen));
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if (offscreen->gl_stencil_handle)
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GE (glDeleteRenderbuffers (1, &offscreen->gl_stencil_handle));
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for (l = offscreen->renderbuffers; l; l = l->next)
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{
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GLuint renderbuffer = GPOINTER_TO_UINT (l->data);
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GE (glDeleteRenderbuffers (1, &renderbuffer));
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}
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g_slist_free (offscreen->renderbuffers);
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GE (glDeleteFramebuffers (1, &offscreen->fbo_handle));
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if (offscreen->texture != COGL_INVALID_HANDLE)
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cogl_handle_unref (offscreen->texture);
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GE (glDeleteFramebuffers (1, &offscreen->fbo_handle));
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g_free (offscreen);
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}
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