eed2479556
The indirection through this API isn't necessary since we no longer arbitrate between the OpenGL matrix API and Cogl's client side API. Also it doesn't help to maintain an OpenGL style matrix mode API for internal use since it's awkward to keep restoring the MODELVIEW mode and easy enough to directly work with the matrix stacks of interest. This replaces use of the _cogl_current_matrix API with direct use of the _cogl_matrix_stack API. All the unused cogl_current_matrix API is removed and the matrix utility code left in cogl-current-matrix.c was moved to cogl.c.
325 lines
11 KiB
C
325 lines
11 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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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->drv.pf_glGenRenderbuffersEXT
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#define glDeleteRenderbuffersEXT ctx->drv.pf_glDeleteRenderbuffersEXT
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#define glBindRenderbufferEXT ctx->drv.pf_glBindRenderbufferEXT
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#define glRenderbufferStorageEXT ctx->drv.pf_glRenderbufferStorageEXT
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#define glGenFramebuffersEXT ctx->drv.pf_glGenFramebuffersEXT
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#define glBindFramebufferEXT ctx->drv.pf_glBindFramebufferEXT
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#define glFramebufferTexture2DEXT ctx->drv.pf_glFramebufferTexture2DEXT
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#define glFramebufferRenderbufferEXT ctx->drv.pf_glFramebufferRenderbufferEXT
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#define glCheckFramebufferStatusEXT ctx->drv.pf_glCheckFramebufferStatusEXT
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#define glDeleteFramebuffersEXT ctx->drv.pf_glDeleteFramebuffersEXT
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#define glBlitFramebufferEXT ctx->drv.pf_glBlitFramebufferEXT
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#define glRenderbufferStorageMultisampleEXT ctx->drv.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);
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CoglHandle
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cogl_offscreen_new_to_texture (CoglHandle texhandle)
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{
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CoglFbo *fbo;
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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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_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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/* The texture must not be sliced */
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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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return COGL_INVALID_HANDLE;
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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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/* 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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* object. (different drivers make different decisions)
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*
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* To avoid an error with drivers that do consider this a problem we
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* explicitly set non mipmapped filters here. These will later be reset when
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* the texture is actually used for rendering according to the filters set on
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* the corresponding CoglMaterial.
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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 = 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->width = width;
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fbo->height = height;
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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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return _cogl_offscreen_handle_new (fbo);
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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_set_draw_buffer (CoglBufferTarget target, CoglHandle offscreen)
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{
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CoglFbo *fbo = NULL;
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CoglDrawBufferState *draw_buffer;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_journal_flush ();
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g_assert (ctx->draw_buffer_stack != NULL);
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draw_buffer = ctx->draw_buffer_stack->data;
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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 (draw_buffer->target != 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_matrix_stack_push (ctx->projection_stack);
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_cogl_matrix_stack_load_identity (ctx->projection_stack);
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_cogl_matrix_stack_push (ctx->modelview_stack);
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_cogl_matrix_stack_load_identity (ctx->modelview_stack);
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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_matrix_stack_load_identity (ctx->projection_stack);
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_cogl_matrix_stack_load_identity (ctx->modelview_stack);
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}
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/* Setup new viewport and matrices */
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cogl_viewport (fbo->width, fbo->height);
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_cogl_matrix_stack_translate (ctx->modelview_stack, -1.0f, -1.0f, 0.0f);
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_cogl_matrix_stack_scale (ctx->modelview_stack, 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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{
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/* Check current draw buffer target */
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if (draw_buffer->target == 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_matrix_stack_pop (ctx->projection_stack);
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_cogl_matrix_stack_pop (ctx->modelview_stack);
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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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}
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/* Store new target */
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draw_buffer->target = target;
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if (draw_buffer->offscreen != offscreen)
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{
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if (draw_buffer->offscreen != COGL_INVALID_HANDLE)
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cogl_handle_unref (draw_buffer->offscreen);
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if (offscreen != COGL_INVALID_HANDLE)
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cogl_handle_ref (offscreen);
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draw_buffer->offscreen = offscreen;
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}
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}
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void
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cogl_push_draw_buffer(void)
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{
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CoglDrawBufferState *old;
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CoglDrawBufferState *draw_buffer;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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g_assert (ctx->draw_buffer_stack != NULL);
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old = ctx->draw_buffer_stack->data;
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draw_buffer = g_slice_new0 (CoglDrawBufferState);
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*draw_buffer = *old;
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ctx->draw_buffer_stack =
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g_slist_prepend (ctx->draw_buffer_stack, draw_buffer);
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}
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void
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cogl_pop_draw_buffer(void)
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{
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CoglDrawBufferState *to_pop;
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CoglDrawBufferState *to_restore;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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g_assert (ctx->draw_buffer_stack != NULL);
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if (ctx->draw_buffer_stack->next == NULL)
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{
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g_warning ("1 more cogl_pop_draw_buffer() than cogl_push_draw_buffer()");
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return;
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}
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to_pop = ctx->draw_buffer_stack->data;
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to_restore = ctx->draw_buffer_stack->next->data;
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/* the logic in cogl_set_draw_buffer() only works if
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* to_pop is still on top of the stack, because
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* cogl_set_draw_buffer() needs to know the previous
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* state.
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*/
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cogl_set_draw_buffer (to_restore->target, to_restore->offscreen);
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/* cogl_set_draw_buffer() should have set top of stack
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* to to_restore
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*/
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g_assert (to_restore->target == to_pop->target);
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g_assert (to_restore->offscreen == to_pop->offscreen);
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g_assert (ctx->draw_buffer_stack->data == to_pop);
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ctx->draw_buffer_stack =
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g_slist_remove_link (ctx->draw_buffer_stack,
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ctx->draw_buffer_stack);
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g_slice_free (CoglDrawBufferState, to_pop);
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}
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