- // Set the movit parameters
- bool ok = effect->set_float( "strength_first", reverse ? mix : inverse );
- ok |= effect->set_float( "strength_second", reverse ? inverse : mix );
- assert( ok );
-
- // Get the frames' textures
- GLuint* texture_id[2] = {0, 0};
- *format = mlt_image_glsl_texture;
- mlt_frame_get_image( a_frame, (uint8_t**) &texture_id[0], format, width, height, 0 );
- a_input->useFBOInput( chain, *texture_id[0] );
- *format = mlt_image_glsl_texture;
- mlt_frame_get_image( b_frame, (uint8_t**) &texture_id[1], format, width, height, 0 );
- b_input->useFBOInput( chain, *texture_id[1] );
-
- // Set resolution to that of the a_frame
- *width = mlt_properties_get_int( a_props, "width" );
- *height = mlt_properties_get_int( a_props, "height" );
-
- // Setup rendering to an FBO
- GlslManager* glsl = GlslManager::get_instance();
- glsl_fbo fbo = glsl->get_fbo( *width, *height );
- if ( output_format == mlt_image_glsl_texture ) {
- glsl_texture texture = glsl->get_texture( *width, *height, GL_RGBA );
-
- glBindFramebuffer( GL_FRAMEBUFFER, fbo->fbo );
- check_error();
- glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture->texture, 0 );
- check_error();
- glBindFramebuffer( GL_FRAMEBUFFER, 0 );
- check_error();
-
- GlslManager::render( service, chain, fbo->fbo, *width, *height );
-
- glFinish();
- check_error();
- glBindFramebuffer( GL_FRAMEBUFFER, 0 );
- check_error();
-
- *image = (uint8_t*) &texture->texture;
- mlt_frame_set_image( a_frame, *image, 0, NULL );
- mlt_properties_set_data( properties, "movit.convert", texture, 0,
- (mlt_destructor) GlslManager::release_texture, NULL );
- *format = output_format;
- }
- else {
- // Use a PBO to hold the data we read back with glReadPixels()
- // (Intel/DRI goes into a slow path if we don't read to PBO)
- GLenum gl_format = ( output_format == mlt_image_rgb24a || output_format == mlt_image_opengl )?
- GL_RGBA : GL_RGB;
- int img_size = *width * *height * ( gl_format == GL_RGB? 3 : 4 );
- glsl_pbo pbo = glsl->get_pbo( img_size );
- glsl_texture texture = glsl->get_texture( *width, *height, gl_format );
-
- if ( fbo && pbo && texture ) {
- // Set the FBO
- glBindFramebuffer( GL_FRAMEBUFFER, fbo->fbo );
- check_error();
- glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture->texture, 0 );
- check_error();
- glBindFramebuffer( GL_FRAMEBUFFER, 0 );
- check_error();
-
- GlslManager::render( service, chain, fbo->fbo, *width, *height );
-
- // Read FBO into PBO
- glBindBuffer( GL_PIXEL_PACK_BUFFER_ARB, pbo->pbo );
- check_error();
- glBufferData( GL_PIXEL_PACK_BUFFER_ARB, img_size, NULL, GL_STREAM_READ );
- check_error();
- glReadPixels( 0, 0, *width, *height, gl_format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0) );
- check_error();
-
- // Copy from PBO
- uint8_t* buf = (uint8_t*) glMapBuffer( GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY );
- check_error();
-
- *format = gl_format == GL_RGBA ? mlt_image_rgb24a : mlt_image_rgb24;
- *image = (uint8_t*) mlt_pool_alloc( img_size );
- mlt_frame_set_image( a_frame, *image, img_size, mlt_pool_release );
- memcpy( *image, buf, img_size );
-
- // Release PBO and FBO
- glUnmapBuffer( GL_PIXEL_PACK_BUFFER_ARB );
- check_error();
- glBindBuffer( GL_PIXEL_PACK_BUFFER_ARB, 0 );
- check_error();
- glBindFramebuffer( GL_FRAMEBUFFER, 0 );
- check_error();
- glBindTexture( GL_TEXTURE_2D, 0 );
- check_error();
- GlslManager::release_texture( texture );
- }
- else {
- error = 1;
- }
- }
- if ( fbo ) GlslManager::release_fbo( fbo );
- mlt_service_unlock( service );