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https://github.com/brl/mutter.git
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08932584b5
This is useful because sometimes we need to get the current matrix, which is too expensive when indirect rendering. In addition, this virtualization makes it easier to clean up the API in the future.
348 lines
11 KiB
C
348 lines
11 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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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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*
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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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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-texture-private.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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/* 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 glDeleteRenderbuffersEXT ctx->pf_glDeleteRenderbuffersEXT
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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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#ifndef GL_READ_FRAMEBUFFER_EXT
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#define GL_READ_FRAMEBUFFER_EXT 0x8CA8
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#endif
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#ifndef GL_DRAW_FRAMEBUFFER_EXT
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#define GL_DRAW_FRAMEBUFFER_EXT 0x8CA9
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#endif
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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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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, COGL_INVALID_HANDLE);
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if (!cogl_features_available (COGL_FEATURE_OFFSCREEN))
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return COGL_INVALID_HANDLE;
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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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tex = _cogl_texture_pointer_from_handle (texhandle);
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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( glGenRenderbuffersEXT (1, &gl_stencil_handle) );
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GE( glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, gl_stencil_handle) );
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GE( glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX8_EXT,
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cogl_texture_get_width (texhandle),
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cogl_texture_get_height (texhandle)) );
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GE( glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, 0) );
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/* Generate framebuffer */
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glGenFramebuffersEXT (1, &fbo_gl_handle);
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GE( glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, fbo_gl_handle) );
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GE( glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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tex->gl_target, tex_gl_handle, 0) );
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GE( glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT,
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GL_STENCIL_ATTACHMENT_EXT,
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GL_RENDERBUFFER_EXT, gl_stencil_handle) );
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/* Make sure it's complete */
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status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
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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( glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT,
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GL_STENCIL_ATTACHMENT_EXT,
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GL_RENDERBUFFER_EXT,
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0) );
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GE( glDeleteRenderbuffersEXT (1, &gl_stencil_handle) );
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gl_stencil_handle = 0;
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status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
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{
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/* Still failing, so give up */
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GE( glDeleteFramebuffersEXT (1, &fbo_gl_handle) );
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GE( glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0) );
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return COGL_INVALID_HANDLE;
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}
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}
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GE( glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 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_offscreen_free (CoglFbo *fbo)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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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( glDeleteRenderbuffersEXT (1, &fbo->gl_stencil_handle) );
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GE( glDeleteFramebuffersEXT (1, &fbo->gl_handle) );
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g_free (fbo);
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}
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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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CoglFbo *src_fbo;
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CoglFbo *dst_fbo;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (!cogl_features_available (COGL_FEATURE_OFFSCREEN_BLIT))
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return;
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/* Make sure these are valid fbo handles */
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if (!cogl_is_offscreen (src_buffer))
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return;
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if (!cogl_is_offscreen (dst_buffer))
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return;
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src_fbo = _cogl_offscreen_pointer_from_handle (src_buffer);
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dst_fbo = _cogl_offscreen_pointer_from_handle (dst_buffer);
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/* Copy (and scale) a region from one to another framebuffer */
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GE( glBindFramebufferEXT (GL_READ_FRAMEBUFFER_EXT, src_fbo->gl_handle) );
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GE( glBindFramebufferEXT (GL_DRAW_FRAMEBUFFER_EXT, dst_fbo->gl_handle) );
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GE( glBlitFramebufferEXT (src_x, src_y, src_x + src_w, src_y + src_h,
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dst_x, dst_y, dst_x + dst_w, dst_y + dst_h,
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GL_COLOR_BUFFER_BIT, GL_LINEAR) );
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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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CoglFbo *src_fbo;
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CoglFbo *dst_fbo;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (!cogl_features_available (COGL_FEATURE_OFFSCREEN_BLIT))
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return;
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/* Make sure these are valid fbo handles */
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if (!cogl_is_offscreen (src_buffer))
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return;
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if (!cogl_is_offscreen (dst_buffer))
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return;
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src_fbo = _cogl_offscreen_pointer_from_handle (src_buffer);
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dst_fbo = _cogl_offscreen_pointer_from_handle (dst_buffer);
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/* Copy (and scale) whole image from one to another framebuffer */
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GE( glBindFramebufferEXT (GL_READ_FRAMEBUFFER_EXT, src_fbo->gl_handle) );
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GE( glBindFramebufferEXT (GL_DRAW_FRAMEBUFFER_EXT, dst_fbo->gl_handle) );
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GE( glBlitFramebufferEXT (0, 0, src_fbo->width, src_fbo->height,
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0, 0, dst_fbo->width, dst_fbo->height,
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GL_COLOR_BUFFER_BIT, GL_LINEAR) );
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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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/* 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( glPushAttrib (GL_VIEWPORT_BIT) );
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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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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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_identity ();
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_identity ();
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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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_cogl_current_matrix_translate (-1.0f, -1.0f, 0.0f);
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_cogl_current_matrix_scale (2.0f / fbo->width, 2.0f / fbo->height, 1.0f);
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/* Bind offscreen framebuffer object */
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GE( glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 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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GE( glPushAttrib (GL_SCISSOR_BIT) );
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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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GE( glPopAttrib () );
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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( glPopAttrib () );
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_pop ();
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_pop ();
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}
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/* Bind window framebuffer object */
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GE( glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 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_FALSE) );
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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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