cc0af441f2
The comment just said: "Some implementation require a clear before drawing to an fbo. Luckily it is affected by scissor test." and did a scissored clear, which is clearly a driver bug workaround, but for what driver? The fact that it was copied into the gles backend (or vica versa is also suspicious since it seems unlikely that the workaround is necessary for both backends.) We can easily restore the workaround with a better comment if this problem really still exists on current drivers, but for now I'd rather minimize hand-wavey workaround code that can't be tested.
321 lines
9.0 KiB
C
321 lines
9.0 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) 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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#include "cogl-gles2-wrapper.h"
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#ifdef HAVE_COGL_GLES2
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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( 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->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( 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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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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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( glGetIntegerv (GL_VIEWPORT, ctx->drv.viewport_store) );
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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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GE( glViewport (0, 0, 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,
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2.0f / fbo->width, 2.0f / fbo->height, 1.0f);
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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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}
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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( glViewport (ctx->drv.viewport_store[0],
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ctx->drv.viewport_store[1],
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ctx->drv.viewport_store[2],
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ctx->drv.viewport_store[3]) );
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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( glBindFramebuffer (GL_FRAMEBUFFER, 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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#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 (CoglHandle handle)
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{
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return FALSE;
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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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return COGL_INVALID_HANDLE;
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}
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CoglHandle
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cogl_offscreen_ref (CoglHandle handle)
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{
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return COGL_INVALID_HANDLE;
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}
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void
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cogl_offscreen_unref (CoglHandle handle)
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{
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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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}
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#endif /* HAVE_COGL_GLES2 */
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