qemu/ui/sdl2-gl.c

   1 /*
   2  * QEMU SDL display driver -- opengl support
   3  *
   4  * Copyright (c) 2014 Red Hat
   5  *
   6  * Authors:
   7  *     Gerd Hoffmann <kraxel@redhat.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu-common.h"
  30 #include "ui/console.h"
  31 #include "ui/input.h"
  32 #include "ui/sdl2.h"
  33 #include "sysemu/sysemu.h"
  34
  35 #include <epoxy/gl.h>
  36
  37 static void sdl2_set_scanout_mode(struct sdl2_console *scon, bool scanout)
  38 {
  39     if (scon->scanout_mode == scanout) {
  40         return;
  41     }
  42
  43     scon->scanout_mode = scanout;
  44     if (!scon->scanout_mode) {
  45         if (scon->fbo_id) {
  46             glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  47                                       GL_COLOR_ATTACHMENT0_EXT,
  48                                       GL_TEXTURE_2D, 0, 0);
  49             glDeleteFramebuffers(1, &scon->fbo_id);
  50             glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
  51             scon->fbo_id = 0;
  52         }
  53         if (scon->surface) {
  54             surface_gl_destroy_texture(scon->gls, scon->surface);
  55             surface_gl_create_texture(scon->gls, scon->surface);
  56         }
  57     }
  58 }
  59
  60 static void sdl2_gl_render_surface(struct sdl2_console *scon)
  61 {
  62     int ww, wh;
  63
  64     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
  65     sdl2_set_scanout_mode(scon, false);
  66
  67     SDL_GetWindowSize(scon->real_window, &ww, &wh);
  68     surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh);
  69
  70     surface_gl_render_texture(scon->gls, scon->surface);
  71     SDL_GL_SwapWindow(scon->real_window);
  72 }
  73
  74 void sdl2_gl_update(DisplayChangeListener *dcl,
  75                     int x, int y, int w, int h)
  76 {
  77     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
  78
  79     assert(scon->opengl);
  80
  81     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
  82     surface_gl_update_texture(scon->gls, scon->surface, x, y, w, h);
  83     scon->updates++;
  84 }
  85
  86 void sdl2_gl_switch(DisplayChangeListener *dcl,
  87                     DisplaySurface *new_surface)
  88 {
  89     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
  90     DisplaySurface *old_surface = scon->surface;
  91
  92     assert(scon->opengl);
  93
  94     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
  95     surface_gl_destroy_texture(scon->gls, scon->surface);
  96
  97     scon->surface = new_surface;
  98
  99     if (!new_surface) {
 100         console_gl_fini_context(scon->gls);
 101         scon->gls = NULL;
 102         sdl2_window_destroy(scon);
 103         return;
 104     }
 105
 106     if (!scon->real_window) {
 107         sdl2_window_create(scon);
 108         scon->gls = console_gl_init_context();
 109     } else if (old_surface &&
 110                ((surface_width(old_surface)  != surface_width(new_surface)) ||
 111                 (surface_height(old_surface) != surface_height(new_surface)))) {
 112         sdl2_window_resize(scon);
 113     }
 114
 115     surface_gl_create_texture(scon->gls, scon->surface);
 116 }
 117
 118 void sdl2_gl_refresh(DisplayChangeListener *dcl)
 119 {
 120     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
 121
 122     assert(scon->opengl);
 123
 124     graphic_hw_update(dcl->con);
 125     if (scon->updates && scon->surface) {
 126         scon->updates = 0;
 127         sdl2_gl_render_surface(scon);
 128     }
 129     sdl2_poll_events(scon);
 130 }
 131
 132 void sdl2_gl_redraw(struct sdl2_console *scon)
 133 {
 134     assert(scon->opengl);
 135
 136     if (scon->surface) {
 137         sdl2_gl_render_surface(scon);
 138     }
 139 }
 140
 141 QEMUGLContext sdl2_gl_create_context(DisplayChangeListener *dcl,
 142                                      QEMUGLParams *params)
 143 {
 144     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
 145     SDL_GLContext ctx;
 146
 147     assert(scon->opengl);
 148
 149     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
 150
 151     SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
 152     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,
 153                         SDL_GL_CONTEXT_PROFILE_CORE);
 154     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, params->major_ver);
 155     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, params->minor_ver);
 156
 157     ctx = SDL_GL_CreateContext(scon->real_window);
 158     return (QEMUGLContext)ctx;
 159 }
 160
 161 void sdl2_gl_destroy_context(DisplayChangeListener *dcl, QEMUGLContext ctx)
 162 {
 163     SDL_GLContext sdlctx = (SDL_GLContext)ctx;
 164
 165     SDL_GL_DeleteContext(sdlctx);
 166 }
 167
 168 int sdl2_gl_make_context_current(DisplayChangeListener *dcl,
 169                                  QEMUGLContext ctx)
 170 {
 171     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
 172     SDL_GLContext sdlctx = (SDL_GLContext)ctx;
 173
 174     assert(scon->opengl);
 175
 176     return SDL_GL_MakeCurrent(scon->real_window, sdlctx);
 177 }
 178
 179 QEMUGLContext sdl2_gl_get_current_context(DisplayChangeListener *dcl)
 180 {
 181     SDL_GLContext sdlctx;
 182
 183     sdlctx = SDL_GL_GetCurrentContext();
 184     return (QEMUGLContext)sdlctx;
 185 }
 186
 187 void sdl2_gl_scanout(DisplayChangeListener *dcl,
 188                      uint32_t backing_id, bool backing_y_0_top,
 189                      uint32_t x, uint32_t y,
 190                      uint32_t w, uint32_t h)
 191 {
 192     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
 193
 194     assert(scon->opengl);
 195     scon->x = x;
 196     scon->y = y;
 197     scon->w = w;
 198     scon->h = h;
 199     scon->tex_id = backing_id;
 200     scon->y0_top = backing_y_0_top;
 201
 202     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
 203
 204     if (scon->tex_id == 0 || scon->w == 0 || scon->h == 0) {
 205         sdl2_set_scanout_mode(scon, false);
 206         return;
 207     }
 208
 209     sdl2_set_scanout_mode(scon, true);
 210     if (!scon->fbo_id) {
 211         glGenFramebuffers(1, &scon->fbo_id);
 212     }
 213
 214     glBindFramebuffer(GL_FRAMEBUFFER_EXT, scon->fbo_id);
 215     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
 216                               GL_TEXTURE_2D, scon->tex_id, 0);
 217 }
 218
 219 void sdl2_gl_scanout_flush(DisplayChangeListener *dcl,
 220                            uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 221 {
 222     struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
 223     int ww, wh, y1, y2;
 224
 225     assert(scon->opengl);
 226     if (!scon->scanout_mode) {
 227         return;
 228     }
 229     if (!scon->fbo_id) {
 230         return;
 231     }
 232
 233     SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
 234
 235     glBindFramebuffer(GL_READ_FRAMEBUFFER, scon->fbo_id);
 236     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 237
 238     SDL_GetWindowSize(scon->real_window, &ww, &wh);
 239     glViewport(0, 0, ww, wh);
 240     y1 = scon->y0_top ? 0 : scon->h;
 241     y2 = scon->y0_top ? scon->h : 0;
 242     glBlitFramebuffer(0, y1, scon->w, y2,
 243                       0, 0, ww, wh,
 244                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 245     glBindFramebuffer(GL_FRAMEBUFFER_EXT, scon->fbo_id);
 246
 247     SDL_GL_SwapWindow(scon->real_window);
 248 }