mirror of
https://github.com/brl/mutter.git
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Bug 1074 - FBOs on GLES
* clutter/cogl/gles/cogl-fbo.c: Copy the code from gl/cogl-fbo but use the API calls directly instead of loading an extension because it is part of the core in GLES 2. * clutter/cogl/gles/cogl.c (_cogl_features_init): Report COGL_FEATURE_OFFSCREEN. * clutter/cogl/gles/cogl-fbo.h (CoglFbo): Add gl_stencil_handle. * clutter/cogl/gles/cogl-context.h (CoglContext): Add viewport_store * tests/test-fbo.c (make_shader): Conditionally use the GLES 2 names of the shader variables
This commit is contained in:
Neil Roberts
parent
153f5ea73f
commit
1b619c3843
@ -79,6 +79,10 @@ typedef struct
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#ifdef HAVE_COGL_GLES2
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CoglGles2Wrapper gles2;
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/* Viewport store for FBOs. Needed because glPushAttrib() isn't
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supported */
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GLint viewport_store[4];
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#endif
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} CoglContext;
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340
gles/cogl-fbo.c
340
gles/cogl-fbo.c
@ -5,7 +5,7 @@
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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* Copyright (C) 2008 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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@ -33,78 +33,278 @@
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#include "cogl-texture.h"
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#include "cogl-fbo.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-gles2-wrapper.h"
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/* Expecting EXT functions not to be defined - redirect to pointers in context */
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#define glGenRenderbuffersEXT ctx->pf_glGenRenderbuffersEXT
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#define glBindRenderbufferEXT ctx->pf_glBindRenderbufferEXT
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#define glRenderbufferStorageEXT ctx->pf_glRenderbufferStorageEXT
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#define glGenFramebuffersEXT ctx->pf_glGenFramebuffersEXT
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#define glBindFramebufferEXT ctx->pf_glBindFramebufferEXT
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#define glFramebufferTexture2DEXT ctx->pf_glFramebufferTexture2DEXT
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#define glFramebufferRenderbufferEXT ctx->pf_glFramebufferRenderbufferEXT
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#define glCheckFramebufferStatusEXT ctx->pf_glCheckFramebufferStatusEXT
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#define glDeleteFramebuffersEXT ctx->pf_glDeleteFramebuffersEXT
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#define glBlitFramebufferEXT ctx->pf_glBlitFramebufferEXT
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#define glRenderbufferStorageMultisampleEXT ctx->pf_glRenderbufferStorageMultisampleEXT
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#ifdef HAVE_COGL_GLES2
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static gint
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_cogl_fbo_handle_find (CoglHandle handle)
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static void _cogl_offscreen_free (CoglFbo *fbo);
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COGL_HANDLE_DEFINE (Fbo, offscreen, fbo_handles);
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CoglHandle
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cogl_offscreen_new_to_texture (CoglHandle texhandle)
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{
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gint i;
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CoglTexture *tex;
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CoglFbo *fbo;
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CoglTexSliceSpan *x_span;
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CoglTexSliceSpan *y_span;
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GLuint tex_gl_handle;
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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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_COGL_GET_CONTEXT (ctx, -1);
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if (ctx->fbo_handles == NULL)
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return -1;
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for (i=0; i < ctx->fbo_handles->len; ++i)
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if (g_array_index (ctx->fbo_handles, CoglHandle, i) == handle)
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return i;
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return -1;
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}
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/*
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static CoglHandle
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_cogl_fbo_handle_new (CoglFbo *fbo)
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{
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_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
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CoglHandle handle = (CoglHandle)fbo;
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if (!cogl_features_available (COGL_FEATURE_OFFSCREEN))
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return COGL_INVALID_HANDLE;
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if (ctx->fbo_handles == NULL)
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ctx->fbo_handles = g_array_new (FALSE, FALSE, sizeof (CoglHandle));
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/* Make texhandle is a valid texture object */
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if (!cogl_is_texture (texhandle))
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return COGL_INVALID_HANDLE;
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g_array_append_val (ctx->fbo_handles, handle);
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tex = _cogl_texture_pointer_from_handle (texhandle);
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return handle;
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/* The texture must not be sliced */
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if (tex->slice_gl_handles == NULL)
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return COGL_INVALID_HANDLE;
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if (tex->slice_gl_handles->len != 1)
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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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x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, 0);
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y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, 0);
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tex_gl_handle = g_array_index (tex->slice_gl_handles, GLuint, 0);
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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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/* 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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/* 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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/* 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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}
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GE( glBindFramebuffer (GL_FRAMEBUFFER, 0) );
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/* Allocate and init a CoglFbo object (store non-wasted size
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for subsequent blits and viewport setup) */
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fbo = (CoglFbo*) g_malloc (sizeof (CoglFbo));
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fbo->ref_count = 1;
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fbo->width = x_span->size - x_span->waste;
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fbo->height = y_span->size - y_span->waste;
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fbo->gl_handle = fbo_gl_handle;
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fbo->gl_stencil_handle = gl_stencil_handle;
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COGL_HANDLE_DEBUG_NEW (offscreen, fbo);
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return _cogl_offscreen_handle_new (fbo);
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}
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CoglHandle
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cogl_offscreen_new_multisample ()
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{
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if (!cogl_features_available (COGL_FEATURE_OFFSCREEN_MULTISAMPLE))
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return COGL_INVALID_HANDLE;
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return COGL_INVALID_HANDLE;
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}
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static void
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_cogl_fbo_handle_release (CoglHandle handle)
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_cogl_offscreen_free (CoglFbo *fbo)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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gint i;
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if ( (i = _cogl_fbo_handle_find (handle)) == -1)
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return;
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g_array_remove_index_fast (ctx->fbo_handles, i);
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/* Frees FBO resources but its handle is not
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released! Do that separately before this! */
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if (fbo->gl_stencil_handle)
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GE( glDeleteRenderbuffers (1, &fbo->gl_stencil_handle) );
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GE( glDeleteFramebuffers (1, &fbo->gl_handle) );
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g_free (fbo);
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}
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static CoglFbo*
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_cogl_fbo_pointer_from_handle (CoglHandle handle)
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void
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cogl_offscreen_blit_region (CoglHandle src_buffer,
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CoglHandle dst_buffer,
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int src_x,
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int src_y,
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int src_w,
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int src_h,
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int dst_x,
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int dst_y,
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int dst_w,
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int dst_h)
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{
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return (CoglFbo*) handle;
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}*/
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/* Not supported on GLES */
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return;
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}
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void
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cogl_offscreen_blit (CoglHandle src_buffer,
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CoglHandle dst_buffer)
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{
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/* Not supported on GLES */
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return;
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}
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void
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cogl_draw_buffer (CoglBufferTarget target, CoglHandle offscreen)
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{
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CoglFbo *fbo = NULL;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (target == COGL_OFFSCREEN_BUFFER)
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{
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GLboolean scissor_enabled;
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GLint scissor_box[4];
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/* Make sure it is a valid fbo handle */
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if (!cogl_is_offscreen (offscreen))
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return;
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fbo = _cogl_offscreen_pointer_from_handle (offscreen);
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/* Check current draw buffer target */
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if (ctx->draw_buffer != COGL_OFFSCREEN_BUFFER)
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{
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/* Push the viewport and matrix setup if redirecting
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from a non-screen buffer */
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GE( glGetIntegerv (GL_VIEWPORT, ctx->viewport_store) );
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GE( cogl_wrap_glMatrixMode (GL_PROJECTION) );
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GE( cogl_wrap_glPushMatrix () );
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GE( cogl_wrap_glLoadIdentity () );
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GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) );
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GE( cogl_wrap_glPushMatrix () );
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GE( cogl_wrap_glLoadIdentity () );
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}
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else
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{
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/* Override viewport and matrix setup if redirecting
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from another offscreen buffer */
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GE( cogl_wrap_glMatrixMode (GL_PROJECTION) );
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GE( cogl_wrap_glLoadIdentity () );
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GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) );
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GE( cogl_wrap_glLoadIdentity () );
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}
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/* Setup new viewport and matrices */
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GE( glViewport (0, 0, fbo->width, fbo->height) );
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GE( cogl_wrap_glTranslatex (-CFX_ONE, -CFX_ONE, 0) );
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GE( cogl_wrap_glScalex (CFX_QDIV (CLUTTER_INT_TO_FIXED (2),
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CLUTTER_INT_TO_FIXED (fbo->width)),
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CFX_QDIV (CLUTTER_INT_TO_FIXED (2),
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CLUTTER_INT_TO_FIXED (fbo->height)),
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CFX_ONE) );
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/* Bind offscreen framebuffer object */
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GE( glBindFramebuffer (GL_FRAMEBUFFER, fbo->gl_handle) );
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) );
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/* Some implementation require a clear before drawing
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to an fbo. Luckily it is affected by scissor test. */
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/* FIXME: test where exactly this is needed end whether
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a glClear with 0 argument is enough */
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scissor_enabled = glIsEnabled (GL_SCISSOR_TEST);
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GE( glGetIntegerv (GL_SCISSOR_BOX, scissor_box) );
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GE( glScissor (0, 0, 0, 0) );
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GE( glEnable (GL_SCISSOR_TEST) );
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GE( glClear (GL_COLOR_BUFFER_BIT) );
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if (!scissor_enabled)
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glDisable (GL_SCISSOR_TEST);
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glScissor (scissor_box[0], scissor_box[1],
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scissor_box[2], scissor_box[3]);
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}
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else if ((target & COGL_WINDOW_BUFFER) ||
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(target & COGL_MASK_BUFFER))
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{
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/* Check current draw buffer target */
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if (ctx->draw_buffer == COGL_OFFSCREEN_BUFFER)
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{
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/* Pop viewport and matrices if redirecting back
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from an offscreen buffer */
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GE( glViewport (ctx->viewport_store[0], ctx->viewport_store[1],
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ctx->viewport_store[2], ctx->viewport_store[3]) );
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GE( cogl_wrap_glMatrixMode (GL_PROJECTION) );
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GE( cogl_wrap_glPopMatrix () );
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GE( cogl_wrap_glMatrixMode (GL_MODELVIEW) );
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GE( cogl_wrap_glPopMatrix () );
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}
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/* Bind window framebuffer object */
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GE( glBindFramebuffer (GL_FRAMEBUFFER, 0) );
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if (target == COGL_WINDOW_BUFFER)
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{
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/* Draw to RGB channels */
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) );
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}
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else if (target == COGL_MASK_BUFFER)
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{
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/* Draw only to ALPHA channel */
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GE( glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE) );
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}
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else
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{
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/* Draw to all channels */
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) );
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}
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}
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/* Store new target */
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ctx->draw_buffer = target;
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}
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#else /* HAVE_COGL_GLES2 */
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/* No support on regular OpenGL 1.1 */
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gboolean
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cogl_is_offscreen_buffer (CoglHandle handle)
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cogl_is_offscreen (CoglHandle handle)
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{
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if (handle == COGL_INVALID_HANDLE)
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return FALSE;
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return _cogl_fbo_handle_find (handle) >= 0;
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return FALSE;
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}
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CoglHandle
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@ -153,38 +353,6 @@ cogl_offscreen_blit (CoglHandle src_buffer,
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void
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cogl_draw_buffer (CoglBufferTarget target, CoglHandle offscreen)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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switch (target)
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{
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case COGL_OFFSCREEN_BUFFER:
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/* Not supported */
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return;
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case COGL_WINDOW_BUFFER:
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/* Draw to RGB channels */
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE) );
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break;
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case COGL_MASK_BUFFER:
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/* Draw only to ALPHA channel */
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GE( glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE) );
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break;
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case COGL_WINDOW_BUFFER & COGL_MASK_BUFFER:
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/* Draw to all channels */
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GE( glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) );
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break;
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default:
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break;
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}
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/* Store new target */
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ctx->draw_buffer = target;
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}
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#endif /* HAVE_COGL_GLES2 */
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@ -32,6 +32,7 @@ typedef struct
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int width;
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int height;
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GLuint gl_handle;
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GLuint gl_stencil_handle;
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} CoglFbo;
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@ -830,7 +830,7 @@ _cogl_features_init ()
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flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
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#ifdef HAVE_COGL_GLES2
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flags |= COGL_FEATURE_SHADERS_GLSL;
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flags |= COGL_FEATURE_SHADERS_GLSL | COGL_FEATURE_OFFSCREEN;
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#endif
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ctx->feature_flags = flags;
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