25db8d0653
When using a pipeline and the journal to blit images between framebuffers, it should disable blending. Otherwise it will end up blending the source texture with uninitialised garbage in the destination texture.
396 lines
12 KiB
C
396 lines
12 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) 2011 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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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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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 <string.h>
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#include "cogl.h"
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#include "cogl-blit.h"
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#include "cogl-context.h"
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#include "cogl-framebuffer-private.h"
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#include "cogl-texture-2d-private.h"
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static const CoglBlitMode *_cogl_blit_default_mode = NULL;
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static gboolean
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_cogl_blit_texture_render_begin (CoglBlitData *data)
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{
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CoglHandle fbo;
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CoglPipeline *pipeline;
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unsigned int dst_width, dst_height;
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_COGL_GET_CONTEXT (ctx, FALSE);
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fbo = _cogl_offscreen_new_to_texture_full
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(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
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if (fbo == COGL_INVALID_HANDLE)
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return FALSE;
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cogl_push_framebuffer (fbo);
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cogl_handle_unref (fbo);
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dst_width = cogl_texture_get_width (data->dst_tex);
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dst_height = cogl_texture_get_height (data->dst_tex);
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/* Set up an orthographic projection so we can use pixel
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coordinates to render to the texture */
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cogl_ortho (0, /* left */
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dst_width, /* right */
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dst_height, /* bottom */
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0, /* top */
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-1, /* near */
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1 /* far */);
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/* We cache a pipeline used for migrating on to the context so
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that it doesn't have to continuously regenerate a shader
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program */
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if (ctx->blit_texture_pipeline == NULL)
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{
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ctx->blit_texture_pipeline = cogl_pipeline_new ();
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cogl_pipeline_set_layer_filters (ctx->blit_texture_pipeline, 0,
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COGL_PIPELINE_FILTER_NEAREST,
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COGL_PIPELINE_FILTER_NEAREST);
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/* Disable blending by just directly taking the contents of the
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source texture */
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cogl_pipeline_set_blend (ctx->blit_texture_pipeline,
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"RGBA = ADD(SRC_COLOR, 0)",
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NULL);
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}
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pipeline = ctx->blit_texture_pipeline;
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cogl_pipeline_set_layer_texture (pipeline, 0, data->src_tex);
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cogl_push_source (pipeline);
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return TRUE;
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}
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static void
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_cogl_blit_texture_render_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height)
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{
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cogl_rectangle_with_texture_coords (dst_x, dst_y,
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dst_x + width,
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dst_y + height,
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src_x / (float) data->src_width,
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src_y / (float) data->src_height,
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(src_x + width) /
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(float) data->src_width,
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(src_y + height) /
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(float) data->src_height);
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}
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static void
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_cogl_blit_texture_render_end (CoglBlitData *data)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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cogl_pop_source ();
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cogl_pop_framebuffer ();
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/* Attach the target texture to the texture render pipeline so that
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we don't keep a reference to the source texture forever. This is
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assuming that the destination texture will live for a long time
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which is currently the case when cogl_blit_* is used from the
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atlas code. It may be better in future to keep around a set of
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dummy 1x1 textures for each texture target that we could bind
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instead. This would also be useful when using a pipeline as a
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hash table key such as for the ARBfp program cache. */
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cogl_pipeline_set_layer_texture (ctx->blit_texture_pipeline, 0,
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data->dst_tex);
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}
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static gboolean
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_cogl_blit_framebuffer_begin (CoglBlitData *data)
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{
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CoglHandle dst_fbo, src_fbo;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* We can only blit between FBOs if both textures are the same
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format and the blit framebuffer extension is supported */
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if ((cogl_texture_get_format (data->src_tex) & ~COGL_A_BIT) !=
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(cogl_texture_get_format (data->dst_tex) & ~COGL_A_BIT) ||
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!cogl_features_available (COGL_FEATURE_OFFSCREEN_BLIT))
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return FALSE;
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dst_fbo = _cogl_offscreen_new_to_texture_full
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(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
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if (dst_fbo == COGL_INVALID_HANDLE)
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return FALSE;
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src_fbo = _cogl_offscreen_new_to_texture_full
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(data->src_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
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if (src_fbo == COGL_INVALID_HANDLE)
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{
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cogl_handle_unref (dst_fbo);
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return FALSE;
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}
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_cogl_push_framebuffers (dst_fbo, src_fbo);
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cogl_handle_unref (src_fbo);
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cogl_handle_unref (dst_fbo);
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return TRUE;
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}
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static void
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_cogl_blit_framebuffer_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height)
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{
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_cogl_blit_framebuffer (src_x, src_y,
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dst_x, dst_y,
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width, height);
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}
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static void
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_cogl_blit_framebuffer_end (CoglBlitData *data)
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{
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cogl_pop_framebuffer ();
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}
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static gboolean
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_cogl_blit_copy_tex_sub_image_begin (CoglBlitData *data)
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{
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CoglHandle fbo;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* This will only work if the target texture is a CoglTexture2D */
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if (!_cogl_is_texture_2d (data->dst_tex))
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return FALSE;
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fbo = _cogl_offscreen_new_to_texture_full
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(data->src_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
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if (fbo == COGL_INVALID_HANDLE)
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return FALSE;
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cogl_push_framebuffer (fbo);
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cogl_handle_unref (fbo);
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return TRUE;
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}
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static void
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_cogl_blit_copy_tex_sub_image_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height)
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{
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_cogl_texture_2d_copy_from_framebuffer (data->dst_tex,
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dst_x, dst_y,
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src_x, src_y,
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width, height);
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}
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static void
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_cogl_blit_copy_tex_sub_image_end (CoglBlitData *data)
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{
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cogl_pop_framebuffer ();
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}
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static gboolean
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_cogl_blit_get_tex_data_begin (CoglBlitData *data)
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{
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data->format = cogl_texture_get_format (data->src_tex);
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data->bpp = _cogl_get_format_bpp (data->format);
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data->image_data = g_malloc (data->bpp * data->src_width *
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data->src_height);
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cogl_texture_get_data (data->src_tex, data->format,
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data->src_width * data->bpp, data->image_data);
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return TRUE;
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}
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static void
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_cogl_blit_get_tex_data_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height)
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{
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cogl_texture_set_region (data->dst_tex,
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src_x, src_y,
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dst_x, dst_y,
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width, height,
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data->src_width, data->src_height,
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data->format,
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data->src_width * data->bpp,
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data->image_data);
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}
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static void
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_cogl_blit_get_tex_data_end (CoglBlitData *data)
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{
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g_free (data->image_data);
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}
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/* These should be specified in order of preference */
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static const CoglBlitMode
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_cogl_blit_modes[] =
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{
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{
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"texture-render",
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_cogl_blit_texture_render_begin,
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_cogl_blit_texture_render_blit,
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_cogl_blit_texture_render_end
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},
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{
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"framebuffer",
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_cogl_blit_framebuffer_begin,
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_cogl_blit_framebuffer_blit,
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_cogl_blit_framebuffer_end
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},
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{
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"copy-tex-sub-image",
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_cogl_blit_copy_tex_sub_image_begin,
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_cogl_blit_copy_tex_sub_image_blit,
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_cogl_blit_copy_tex_sub_image_end
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},
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{
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"get-tex-data",
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_cogl_blit_get_tex_data_begin,
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_cogl_blit_get_tex_data_blit,
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_cogl_blit_get_tex_data_end
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}
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};
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void
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_cogl_blit_begin (CoglBlitData *data,
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CoglHandle dst_tex,
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CoglHandle src_tex)
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{
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int i;
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if (_cogl_blit_default_mode == NULL)
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{
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const char *default_mode_string;
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/* Allow the default to be specified with an environment
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variable. For the time being these functions are only used
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when blitting between atlas textures so the environment
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variable is named to be specific to the atlas code. If we
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want to use the code in other places we should create another
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environment variable for each specific use case */
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if ((default_mode_string = g_getenv ("COGL_ATLAS_DEFAULT_BLIT_MODE")))
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{
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for (i = 0; i < G_N_ELEMENTS (_cogl_blit_modes); i++)
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if (!strcmp (_cogl_blit_modes[i].name, default_mode_string))
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{
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_cogl_blit_default_mode = _cogl_blit_modes + i;
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break;
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}
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if (i >= G_N_ELEMENTS (_cogl_blit_modes))
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{
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g_warning ("Unknown blit mode %s", default_mode_string);
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_cogl_blit_default_mode = _cogl_blit_modes;
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}
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}
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else
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/* Default to the first blit mode */
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_cogl_blit_default_mode = _cogl_blit_modes;
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}
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data->dst_tex = dst_tex;
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data->src_tex = src_tex;
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data->src_width = cogl_texture_get_width (src_tex);
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data->src_height = cogl_texture_get_height (src_tex);
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/* Try the default blit mode first */
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if (!_cogl_blit_default_mode->begin_func (data))
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{
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COGL_NOTE (ATLAS, "Failed to set up blit mode %s",
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_cogl_blit_default_mode->name);
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/* Try all of the other modes in order */
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for (i = 0; i < G_N_ELEMENTS (_cogl_blit_modes); i++)
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if (_cogl_blit_modes + i != _cogl_blit_default_mode &&
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_cogl_blit_modes[i].begin_func (data))
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{
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/* Use this mode as the default from now on */
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_cogl_blit_default_mode = _cogl_blit_modes + i;
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break;
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}
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else
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COGL_NOTE (ATLAS,
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"Failed to set up blit mode %s",
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_cogl_blit_modes[i].name);
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/* The last blit mode can't fail so this should never happen */
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g_return_if_fail (i < G_N_ELEMENTS (_cogl_blit_modes));
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}
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data->blit_mode = _cogl_blit_default_mode;
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COGL_NOTE (ATLAS, "Setup blit using %s", _cogl_blit_default_mode->name);
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}
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void
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_cogl_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height)
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{
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data->blit_mode->blit_func (data, src_x, src_y, dst_x, dst_y, width, height);
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}
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void
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_cogl_blit_end (CoglBlitData *data)
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{
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data->blit_mode->end_func (data);
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}
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