814 lines
27 KiB
C
814 lines
27 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2014 Red Hat, Inc.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkcairo.h"
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#include "gdkglcontextprivate.h"
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#include "gdkinternals.h"
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#include <epoxy/gl.h>
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#include <math.h>
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#include <string.h>
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static cairo_user_data_key_t direct_key;
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void
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gdk_cairo_surface_mark_as_direct (cairo_surface_t *surface,
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GdkWindow *window)
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{
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cairo_surface_set_user_data (surface, &direct_key,
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g_object_ref (window), g_object_unref);
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}
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static const char *
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get_vertex_type_name (int type)
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{
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switch (type)
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{
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case GL_VERTEX_SHADER:
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return "vertex";
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case GL_GEOMETRY_SHADER:
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return "geometry";
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case GL_FRAGMENT_SHADER:
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return "fragment";
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}
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return "unknown";
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}
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static guint
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create_shader (int type,
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const char *code)
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{
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guint shader;
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int status;
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shader = glCreateShader (type);
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glShaderSource (shader, 1, &code, NULL);
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glCompileShader (shader);
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glGetShaderiv (shader, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE)
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{
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int log_len;
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char *buffer;
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glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc (log_len + 1);
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glGetShaderInfoLog (shader, log_len, NULL, buffer);
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g_warning ("Compile failure in %s shader:\n%s", get_vertex_type_name (type), buffer);
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g_free (buffer);
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glDeleteShader (shader);
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return 0;
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}
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return shader;
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}
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static void
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make_program (GdkGLContextProgram *program,
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const char *vertex_shader_path,
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const char *fragment_shader_path)
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{
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guint vertex_shader, fragment_shader;
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GBytes *source;
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int status;
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source = g_resources_lookup_data (vertex_shader_path, 0, NULL);
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g_assert (source != NULL);
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vertex_shader = create_shader (GL_VERTEX_SHADER, g_bytes_get_data (source, NULL));
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g_bytes_unref (source);
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if (vertex_shader == 0)
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return;
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source = g_resources_lookup_data (fragment_shader_path, 0, NULL);
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g_assert (source != NULL);
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fragment_shader = create_shader (GL_FRAGMENT_SHADER, g_bytes_get_data (source, NULL));
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g_bytes_unref (source);
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if (fragment_shader == 0)
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{
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glDeleteShader (vertex_shader);
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return;
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}
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program->program = glCreateProgram ();
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glAttachShader (program->program, vertex_shader);
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glAttachShader (program->program, fragment_shader);
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glLinkProgram (program->program);
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glDeleteShader (vertex_shader);
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glDeleteShader (fragment_shader);
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glGetProgramiv (program->program, GL_LINK_STATUS, &status);
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if (status == GL_FALSE)
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{
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int log_len;
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char *buffer;
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glGetProgramiv (program->program, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc (log_len + 1);
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glGetProgramInfoLog (program->program, log_len, NULL, buffer);
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g_warning ("Linker failure: %s\n", buffer);
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g_free (buffer);
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glDeleteProgram (program->program);
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}
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program->position_location = glGetAttribLocation (program->program, "position");
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program->uv_location = glGetAttribLocation (program->program, "uv");
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program->map_location = glGetUniformLocation (program->program, "map");
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program->flip_location = glGetUniformLocation (program->program, "flipColors");
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}
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static void
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bind_vao (GdkGLContextPaintData *paint_data)
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{
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if (paint_data->vertex_array_object == 0)
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{
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glGenVertexArrays (1, &paint_data->vertex_array_object);
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/* ATM we only use one VAO, so always bind it */
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glBindVertexArray (paint_data->vertex_array_object);
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}
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}
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static void
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use_texture_gles_program (GdkGLContextPaintData *paint_data)
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{
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if (paint_data->texture_2d_quad_program.program == 0)
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make_program (&paint_data->texture_2d_quad_program,
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"/org/gtk/libgdk/glsl/gles2-texture.vs.glsl",
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"/org/gtk/libgdk/glsl/gles2-texture.fs.glsl");
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if (paint_data->current_program != &paint_data->texture_2d_quad_program)
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{
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paint_data->current_program = &paint_data->texture_2d_quad_program;
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glUseProgram (paint_data->current_program->program);
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}
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}
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static void
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use_texture_2d_program (GdkGLContextPaintData *paint_data)
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{
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const char *vertex_shader_path = paint_data->is_legacy
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? "/org/gtk/libgdk/glsl/gl2-texture-2d.vs.glsl"
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: "/org/gtk/libgdk/glsl/gl3-texture-2d.vs.glsl";
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const char *fragment_shader_path = paint_data->is_legacy
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? "/org/gtk/libgdk/glsl/gl2-texture-2d.fs.glsl"
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: "/org/gtk/libgdk/glsl/gl3-texture-2d.fs.glsl";
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if (paint_data->texture_2d_quad_program.program == 0)
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make_program (&paint_data->texture_2d_quad_program, vertex_shader_path, fragment_shader_path);
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if (paint_data->current_program != &paint_data->texture_2d_quad_program)
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{
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paint_data->current_program = &paint_data->texture_2d_quad_program;
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glUseProgram (paint_data->current_program->program);
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}
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}
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static void
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use_texture_rect_program (GdkGLContextPaintData *paint_data)
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{
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const char *vertex_shader_path = paint_data->is_legacy
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? "/org/gtk/libgdk/glsl/gl2-texture-rect.vs.glsl"
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: "/org/gtk/libgdk/glsl/gl3-texture-rect.vs.glsl";
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const char *fragment_shader_path = paint_data->is_legacy
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? "/org/gtk/libgdk/glsl/gl2-texture-rect.fs.glsl"
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: "/org/gtk/libgdk/glsl/gl3-texture-rect.vs.glsl";
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if (paint_data->texture_rect_quad_program.program == 0)
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make_program (&paint_data->texture_rect_quad_program, vertex_shader_path, fragment_shader_path);
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if (paint_data->current_program != &paint_data->texture_rect_quad_program)
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{
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paint_data->current_program = &paint_data->texture_rect_quad_program;
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glUseProgram (paint_data->current_program->program);
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}
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}
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void
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gdk_gl_texture_quads (GdkGLContext *paint_context,
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guint texture_target,
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int n_quads,
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GdkTexturedQuad *quads,
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gboolean flip_colors)
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{
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GdkGLContextPaintData *paint_data = gdk_gl_context_get_paint_data (paint_context);
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GdkGLContextProgram *program;
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GdkWindow *window = gdk_gl_context_get_window (paint_context);
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int window_scale = gdk_window_get_scale_factor (window);
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float w = gdk_window_get_width (window) * window_scale;
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float h = gdk_window_get_height (window) * window_scale;
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int i;
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float *vertex_buffer_data;
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bind_vao (paint_data);
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if (paint_data->tmp_vertex_buffer == 0)
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glGenBuffers(1, &paint_data->tmp_vertex_buffer);
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if (paint_data->use_es)
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use_texture_gles_program (paint_data);
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else
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{
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if (texture_target == GL_TEXTURE_RECTANGLE_ARB)
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use_texture_rect_program (paint_data);
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else
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use_texture_2d_program (paint_data);
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}
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program = paint_data->current_program;
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/* Use texture unit 0 */
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glActiveTexture (GL_TEXTURE0);
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glUniform1i(program->map_location, 0);
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/* Flip 'R' and 'B' colors on GLES, if necessary */
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if (gdk_gl_context_get_use_es (paint_context))
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glUniform1i (program->flip_location, flip_colors ? 1 : 0);
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glEnableVertexAttribArray (program->position_location);
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glEnableVertexAttribArray (program->uv_location);
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glBindBuffer (GL_ARRAY_BUFFER, paint_data->tmp_vertex_buffer);
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glVertexAttribPointer (program->position_location, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, NULL);
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glVertexAttribPointer (program->uv_location, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, (void *) (sizeof(float) * 2));
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#define VERTEX_SIZE 4
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#define QUAD_N_VERTICES 6
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#define QUAD_SIZE (VERTEX_SIZE * QUAD_N_VERTICES)
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vertex_buffer_data = g_new (float, n_quads * QUAD_SIZE);
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for (i = 0; i < n_quads; i++)
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{
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GdkTexturedQuad *quad = &quads[i];
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float vertex_data[] = {
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(quad->x1 * 2) / w - 1, (quad->y1 * 2) / h - 1, quad->u1, quad->v1,
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(quad->x1 * 2) / w - 1, (quad->y2 * 2) / h - 1, quad->u1, quad->v2,
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(quad->x2 * 2) / w - 1, (quad->y1 * 2) / h - 1, quad->u2, quad->v1,
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(quad->x2 * 2) / w - 1, (quad->y2 * 2) / h - 1, quad->u2, quad->v2,
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(quad->x1 * 2) / w - 1, (quad->y2 * 2) / h - 1, quad->u1, quad->v2,
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(quad->x2 * 2) / w - 1, (quad->y1 * 2) / h - 1, quad->u2, quad->v1,
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};
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float *vertex = &vertex_buffer_data[i * QUAD_SIZE];
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memcpy (vertex, vertex_data, sizeof(vertex_data));
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}
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glBufferData (GL_ARRAY_BUFFER, sizeof(float) * n_quads * QUAD_SIZE, vertex_buffer_data, GL_STREAM_DRAW);
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glDrawArrays (GL_TRIANGLES, 0, n_quads * QUAD_N_VERTICES);
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g_free (vertex_buffer_data);
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glDisableVertexAttribArray (program->position_location);
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glDisableVertexAttribArray (program->uv_location);
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}
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/* x,y,width,height describes a rectangle in the gl render buffer
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coordinate space, and its top left corner is drawn at the current
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position according to the cairo translation. */
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/**
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* gdk_cairo_draw_from_gl:
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* @cr: a cairo context
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* @window: The window we're rendering for (not necessarily into)
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* @source: The GL ID of the source buffer
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* @source_type: The type of the @source
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* @buffer_scale: The scale-factor that the @source buffer is allocated for
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* @x: The source x position in @source to start copying from in GL coordinates
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* @y: The source y position in @source to start copying from in GL coordinates
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* @width: The width of the region to draw
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* @height: The height of the region to draw
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*
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* This is the main way to draw GL content in GTK+. It takes a render buffer ID
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* (@source_type == #GL_RENDERBUFFER) or a texture id (@source_type == #GL_TEXTURE)
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* and draws it onto @cr with an OVER operation, respecting the current clip.
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* The top left corner of the rectangle specified by @x, @y, @width and @height
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* will be drawn at the current (0,0) position of the cairo_t.
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*
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* This will work for *all* cairo_t, as long as @window is realized, but the
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* fallback implementation that reads back the pixels from the buffer may be
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* used in the general case. In the case of direct drawing to a window with
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* no special effects applied to @cr it will however use a more efficient
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* approach.
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*
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* For #GL_RENDERBUFFER the code will always fall back to software for buffers
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* with alpha components, so make sure you use #GL_TEXTURE if using alpha.
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*
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* Calling this may change the current GL context.
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*
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* Since: 3.16
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*/
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void
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gdk_cairo_draw_from_gl (cairo_t *cr,
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GdkWindow *window,
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int source,
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int source_type,
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int buffer_scale,
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int x,
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int y,
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int width,
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int height)
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{
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GdkGLContext *paint_context, *current_context;
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cairo_surface_t *image;
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cairo_matrix_t matrix;
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int dx, dy, window_scale;
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gboolean trivial_transform;
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cairo_surface_t *group_target;
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GdkWindow *direct_window, *impl_window;
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guint framebuffer;
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int alpha_size = 0;
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cairo_region_t *clip_region;
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GdkGLContextPaintData *paint_data;
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GLsync sync;
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impl_window = window->impl_window;
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window_scale = gdk_window_get_scale_factor (impl_window);
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paint_context = gdk_window_get_paint_gl_context (window, NULL);
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if (paint_context == NULL)
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{
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g_warning ("gdk_cairo_draw_gl_render_buffer failed - no paint context");
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return;
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}
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clip_region = gdk_cairo_region_from_clip (cr);
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current_context = gdk_gl_context_get_current ();
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if ((current_context != NULL) && (current_context != paint_context) &&
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gdk_gl_context_has_sync (current_context))
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sync = glFenceSync (GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
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else
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sync = NULL;
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gdk_gl_context_make_current (paint_context);
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if (sync)
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{
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glWaitSync (sync, 0, GL_TIMEOUT_IGNORED);
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glDeleteSync (sync);
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sync = NULL;
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}
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paint_data = gdk_gl_context_get_paint_data (paint_context);
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if (paint_data->tmp_framebuffer == 0)
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glGenFramebuffers (1, &paint_data->tmp_framebuffer);
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if (source_type == GL_RENDERBUFFER)
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{
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glBindRenderbuffer (GL_RENDERBUFFER, source);
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glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_ALPHA_SIZE, &alpha_size);
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}
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else if (source_type == GL_TEXTURE)
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{
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glBindTexture (GL_TEXTURE_2D, source);
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if (gdk_gl_context_has_tex_param (paint_context))
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &alpha_size);
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else
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alpha_size = 1;
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}
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else
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{
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g_warning ("Unsupported gl source type %d\n", source_type);
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return;
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}
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group_target = cairo_get_group_target (cr);
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direct_window = cairo_surface_get_user_data (group_target, &direct_key);
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cairo_get_matrix (cr, &matrix);
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dx = matrix.x0;
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dy = matrix.y0;
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/* Trivial == integer-only translation */
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trivial_transform =
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(double)dx == matrix.x0 && (double)dy == matrix.y0 &&
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matrix.xx == 1.0 && matrix.xy == 0.0 &&
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matrix.yx == 0.0 && matrix.yy == 1.0;
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/* For direct paint of non-alpha renderbuffer, we can
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just do a bitblit */
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if ((_gdk_gl_flags & GDK_GL_SOFTWARE_DRAW_GL) == 0 &&
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source_type == GL_RENDERBUFFER &&
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alpha_size == 0 &&
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direct_window != NULL &&
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direct_window->current_paint.use_gl &&
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gdk_gl_context_has_framebuffer_blit (paint_context) &&
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trivial_transform &&
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clip_region != NULL)
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{
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int unscaled_window_height;
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int i;
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/* Create a framebuffer with the source renderbuffer and
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make it the current target for reads */
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framebuffer = paint_data->tmp_framebuffer;
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glBindFramebuffer (GL_FRAMEBUFFER, framebuffer);
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glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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GL_RENDERBUFFER, source);
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glBindFramebuffer (GL_DRAW_FRAMEBUFFER, 0);
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/* Translate to impl coords */
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cairo_region_translate (clip_region, dx, dy);
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glEnable (GL_SCISSOR_TEST);
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gdk_window_get_unscaled_size (impl_window, NULL, &unscaled_window_height);
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/* We can use glDrawBuffer on OpenGL only; on GLES 2.0 we are already
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* double buffered so we don't need it...
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*/
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if (!gdk_gl_context_get_use_es (paint_context))
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glDrawBuffer (GL_BACK);
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else
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{
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int maj, min;
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gdk_gl_context_get_version (paint_context, &maj, &min);
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/* ... but on GLES 3.0 we can use the vectorized glDrawBuffers
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* call.
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*/
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if ((maj * 100 + min) >= 300)
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{
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static const GLenum buffers[] = { GL_BACK };
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glDrawBuffers (G_N_ELEMENTS (buffers), buffers);
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}
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}
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#define FLIP_Y(_y) (unscaled_window_height - (_y))
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for (i = 0; i < cairo_region_num_rectangles (clip_region); i++)
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{
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cairo_rectangle_int_t clip_rect, dest;
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cairo_region_get_rectangle (clip_region, i, &clip_rect);
|
|
clip_rect.x *= window_scale;
|
|
clip_rect.y *= window_scale;
|
|
clip_rect.width *= window_scale;
|
|
clip_rect.height *= window_scale;
|
|
|
|
glScissor (clip_rect.x, FLIP_Y (clip_rect.y + clip_rect.height),
|
|
clip_rect.width, clip_rect.height);
|
|
|
|
dest.x = dx * window_scale;
|
|
dest.y = dy * window_scale;
|
|
dest.width = width * window_scale / buffer_scale;
|
|
dest.height = height * window_scale / buffer_scale;
|
|
|
|
if (gdk_rectangle_intersect (&clip_rect, &dest, &dest))
|
|
{
|
|
int clipped_src_x = x + (dest.x - dx * window_scale);
|
|
int clipped_src_y = y + (height - dest.height - (dest.y - dy * window_scale));
|
|
glBlitFramebuffer (clipped_src_x, clipped_src_y,
|
|
(clipped_src_x + dest.width), (clipped_src_y + dest.height),
|
|
dest.x, FLIP_Y(dest.y + dest.height),
|
|
dest.x + dest.width, FLIP_Y(dest.y),
|
|
GL_COLOR_BUFFER_BIT, GL_NEAREST);
|
|
if (impl_window->current_paint.flushed_region)
|
|
{
|
|
cairo_rectangle_int_t flushed_rect;
|
|
|
|
flushed_rect.x = dest.x / window_scale;
|
|
flushed_rect.y = dest.y / window_scale;
|
|
flushed_rect.width = (dest.x + dest.width + window_scale - 1) / window_scale - flushed_rect.x;
|
|
flushed_rect.height = (dest.y + dest.height + window_scale - 1) / window_scale - flushed_rect.y;
|
|
|
|
cairo_region_union_rectangle (impl_window->current_paint.flushed_region,
|
|
&flushed_rect);
|
|
cairo_region_subtract_rectangle (impl_window->current_paint.need_blend_region,
|
|
&flushed_rect);
|
|
}
|
|
}
|
|
}
|
|
|
|
glDisable (GL_SCISSOR_TEST);
|
|
|
|
glBindFramebuffer (GL_FRAMEBUFFER, 0);
|
|
|
|
#undef FLIP_Y
|
|
|
|
}
|
|
/* For direct paint of alpha or non-alpha textures we can use texturing */
|
|
else if ((_gdk_gl_flags & GDK_GL_SOFTWARE_DRAW_GL) == 0 &&
|
|
source_type == GL_TEXTURE &&
|
|
direct_window != NULL &&
|
|
direct_window->current_paint.use_gl &&
|
|
trivial_transform &&
|
|
clip_region != NULL)
|
|
{
|
|
int unscaled_window_height;
|
|
GLint texture_width;
|
|
GLint texture_height;
|
|
int i, n_rects, n_quads;
|
|
GdkTexturedQuad *quads;
|
|
cairo_rectangle_int_t clip_rect;
|
|
|
|
/* Translate to impl coords */
|
|
cairo_region_translate (clip_region, dx, dy);
|
|
|
|
glBindTexture (GL_TEXTURE_2D, source);
|
|
|
|
if (gdk_gl_context_get_use_es (paint_context) ||
|
|
!gdk_gl_context_has_tex_param (paint_context))
|
|
{
|
|
texture_width = width;
|
|
texture_height = height;
|
|
}
|
|
else
|
|
{
|
|
glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &texture_width);
|
|
glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &texture_height);
|
|
}
|
|
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
glEnable (GL_SCISSOR_TEST);
|
|
|
|
gdk_window_get_unscaled_size (impl_window, NULL, &unscaled_window_height);
|
|
|
|
#define FLIP_Y(_y) (unscaled_window_height - (_y))
|
|
|
|
cairo_region_get_extents (clip_region, &clip_rect);
|
|
|
|
glScissor (clip_rect.x * window_scale, FLIP_Y ((clip_rect.y + clip_rect.height) * window_scale),
|
|
clip_rect.width * window_scale, clip_rect.height * window_scale);
|
|
|
|
n_quads = 0;
|
|
n_rects = cairo_region_num_rectangles (clip_region);
|
|
quads = g_new (GdkTexturedQuad, n_rects);
|
|
for (i = 0; i < n_rects; i++)
|
|
{
|
|
cairo_rectangle_int_t dest;
|
|
|
|
cairo_region_get_rectangle (clip_region, i, &clip_rect);
|
|
|
|
clip_rect.x *= window_scale;
|
|
clip_rect.y *= window_scale;
|
|
clip_rect.width *= window_scale;
|
|
clip_rect.height *= window_scale;
|
|
|
|
dest.x = dx * window_scale;
|
|
dest.y = dy * window_scale;
|
|
dest.width = width * window_scale / buffer_scale;
|
|
dest.height = height * window_scale / buffer_scale;
|
|
|
|
if (gdk_rectangle_intersect (&clip_rect, &dest, &dest))
|
|
{
|
|
int clipped_src_x = x + (dest.x - dx * window_scale);
|
|
int clipped_src_y = y + (height - dest.height - (dest.y - dy * window_scale));
|
|
GdkTexturedQuad quad = {
|
|
dest.x, FLIP_Y(dest.y),
|
|
dest.x + dest.width, FLIP_Y(dest.y + dest.height),
|
|
clipped_src_x / (float)texture_width, (clipped_src_y + dest.height) / (float)texture_height,
|
|
(clipped_src_x + dest.width) / (float)texture_width, clipped_src_y / (float)texture_height,
|
|
};
|
|
|
|
quads[n_quads++] = quad;
|
|
|
|
if (impl_window->current_paint.flushed_region)
|
|
{
|
|
cairo_rectangle_int_t flushed_rect;
|
|
|
|
flushed_rect.x = dest.x / window_scale;
|
|
flushed_rect.y = dest.y / window_scale;
|
|
flushed_rect.width = (dest.x + dest.width + window_scale - 1) / window_scale - flushed_rect.x;
|
|
flushed_rect.height = (dest.y + dest.height + window_scale - 1) / window_scale - flushed_rect.y;
|
|
|
|
cairo_region_union_rectangle (impl_window->current_paint.flushed_region,
|
|
&flushed_rect);
|
|
cairo_region_subtract_rectangle (impl_window->current_paint.need_blend_region,
|
|
&flushed_rect);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (n_quads > 0)
|
|
gdk_gl_texture_quads (paint_context, GL_TEXTURE_2D, n_quads, quads, FALSE);
|
|
|
|
g_free (quads);
|
|
|
|
if (alpha_size != 0)
|
|
glDisable (GL_BLEND);
|
|
|
|
#undef FLIP_Y
|
|
|
|
}
|
|
else
|
|
{
|
|
/* Software fallback */
|
|
int major, minor, version;
|
|
|
|
gdk_gl_context_get_version (paint_context, &major, &minor);
|
|
version = major * 100 + minor;
|
|
|
|
/* TODO: Use glTexSubImage2D() and do a row-by-row copy to replace
|
|
* the GL_UNPACK_ROW_LENGTH support
|
|
*/
|
|
if (gdk_gl_context_get_use_es (paint_context) &&
|
|
!(version >= 300 || gdk_gl_context_has_unpack_subimage (paint_context)))
|
|
goto out;
|
|
|
|
/* TODO: avoid reading back non-required data due to dest clip */
|
|
image = cairo_surface_create_similar_image (cairo_get_target (cr),
|
|
(alpha_size == 0) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32,
|
|
width, height);
|
|
|
|
cairo_surface_set_device_scale (image, buffer_scale, buffer_scale);
|
|
|
|
framebuffer = paint_data->tmp_framebuffer;
|
|
glBindFramebuffer (GL_FRAMEBUFFER, framebuffer);
|
|
|
|
if (source_type == GL_RENDERBUFFER)
|
|
{
|
|
/* Create a framebuffer with the source renderbuffer and
|
|
make it the current target for reads */
|
|
glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
|
|
GL_RENDERBUFFER, source);
|
|
}
|
|
else
|
|
{
|
|
glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
|
|
GL_TEXTURE_2D, source, 0);
|
|
}
|
|
|
|
glPixelStorei (GL_PACK_ALIGNMENT, 4);
|
|
glPixelStorei (GL_PACK_ROW_LENGTH, cairo_image_surface_get_stride (image) / 4);
|
|
|
|
/* The implicit format conversion is going to make this path slower */
|
|
if (!gdk_gl_context_get_use_es (paint_context))
|
|
glReadPixels (x, y, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
|
|
cairo_image_surface_get_data (image));
|
|
else if (gdk_gl_context_has_texture_format_bgra (paint_context) && G_BYTE_ORDER == G_LITTLE_ENDIAN)
|
|
glReadPixels (x, y, width, height, GL_BGRA, GL_UNSIGNED_BYTE,
|
|
cairo_image_surface_get_data (image));
|
|
else
|
|
glReadPixels (x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE,
|
|
cairo_image_surface_get_data (image));
|
|
|
|
glPixelStorei (GL_PACK_ROW_LENGTH, 0);
|
|
|
|
glBindFramebuffer (GL_FRAMEBUFFER, 0);
|
|
|
|
cairo_surface_mark_dirty (image);
|
|
|
|
/* Invert due to opengl having different origin */
|
|
cairo_scale (cr, 1, -1);
|
|
cairo_translate (cr, 0, -height / buffer_scale);
|
|
|
|
cairo_set_source_surface (cr, image, 0, 0);
|
|
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
|
|
cairo_paint (cr);
|
|
|
|
cairo_surface_destroy (image);
|
|
}
|
|
|
|
out:
|
|
if (clip_region)
|
|
cairo_region_destroy (clip_region);
|
|
|
|
}
|
|
|
|
/* This is always called with the paint context current */
|
|
void
|
|
gdk_gl_texture_from_surface (cairo_surface_t *surface,
|
|
cairo_region_t *region)
|
|
{
|
|
GdkGLContext *paint_context;
|
|
cairo_surface_t *image;
|
|
double device_x_offset, device_y_offset;
|
|
cairo_rectangle_int_t rect, e;
|
|
int n_rects, i;
|
|
GdkWindow *window;
|
|
int unscaled_window_height;
|
|
unsigned int texture_id;
|
|
int window_scale;
|
|
double sx, sy;
|
|
float umax, vmax;
|
|
gboolean use_texture_rectangle;
|
|
guint target;
|
|
paint_context = gdk_gl_context_get_current ();
|
|
if ((_gdk_gl_flags & GDK_GL_SOFTWARE_DRAW_SURFACE) == 0 &&
|
|
paint_context &&
|
|
GDK_GL_CONTEXT_GET_CLASS (paint_context)->texture_from_surface &&
|
|
GDK_GL_CONTEXT_GET_CLASS (paint_context)->texture_from_surface (paint_context, surface, region))
|
|
return;
|
|
|
|
/* Software fallback */
|
|
use_texture_rectangle = gdk_gl_context_use_texture_rectangle (paint_context);
|
|
|
|
window = gdk_gl_context_get_window (paint_context);
|
|
window_scale = gdk_window_get_scale_factor (window);
|
|
gdk_window_get_unscaled_size (window, NULL, &unscaled_window_height);
|
|
|
|
sx = sy = 1;
|
|
cairo_surface_get_device_scale (window->current_paint.surface, &sx, &sy);
|
|
|
|
cairo_surface_get_device_offset (surface,
|
|
&device_x_offset, &device_y_offset);
|
|
|
|
glGenTextures (1, &texture_id);
|
|
if (use_texture_rectangle)
|
|
target = GL_TEXTURE_RECTANGLE_ARB;
|
|
else
|
|
target = GL_TEXTURE_2D;
|
|
|
|
glBindTexture (target, texture_id);
|
|
glEnable (GL_SCISSOR_TEST);
|
|
|
|
glTexParameteri (target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri (target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri (target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameteri (target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
n_rects = cairo_region_num_rectangles (region);
|
|
|
|
#define FLIP_Y(_y) (unscaled_window_height - (_y))
|
|
|
|
for (i = 0; i < n_rects; i++)
|
|
{
|
|
cairo_region_get_rectangle (region, i, &rect);
|
|
|
|
glScissor (rect.x * window_scale, FLIP_Y ((rect.y + rect.height) * window_scale),
|
|
rect.width * window_scale, rect.height * window_scale);
|
|
|
|
e = rect;
|
|
e.x *= sx;
|
|
e.y *= sy;
|
|
e.x += (int)device_x_offset;
|
|
e.y += (int)device_y_offset;
|
|
e.width *= sx;
|
|
e.height *= sy;
|
|
image = cairo_surface_map_to_image (surface, &e);
|
|
|
|
gdk_gl_context_upload_texture (paint_context, image, e.width, e.height, target);
|
|
|
|
cairo_surface_unmap_image (surface, image);
|
|
|
|
if (use_texture_rectangle)
|
|
{
|
|
umax = rect.width * sx;
|
|
vmax = rect.height * sy;
|
|
}
|
|
else
|
|
{
|
|
umax = 1.0;
|
|
vmax = 1.0;
|
|
}
|
|
|
|
{
|
|
GdkTexturedQuad quad = {
|
|
rect.x * window_scale, FLIP_Y(rect.y * window_scale),
|
|
(rect.x + rect.width) * window_scale, FLIP_Y((rect.y + rect.height) * window_scale),
|
|
0, 0,
|
|
umax, vmax,
|
|
};
|
|
|
|
/* We don't want to combine the quads here, because they have different textures.
|
|
* And we don't want to upload the unused source areas to make it one texture. */
|
|
gdk_gl_texture_quads (paint_context, target, 1, &quad, TRUE);
|
|
}
|
|
}
|
|
|
|
#undef FLIP_Y
|
|
|
|
glDisable (GL_SCISSOR_TEST);
|
|
glDeleteTextures (1, &texture_id);
|
|
}
|