ui/gtk-gl-area.c

   1 /*
   2  * GTK UI -- glarea opengl code.
   3  *
   4  * Requires 3.16+ (GtkGLArea widget).
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qemu-common.h"
  12
  13 #include "trace.h"
  14
  15 #include "ui/console.h"
  16 #include "ui/gtk.h"
  17 #include "ui/egl-helpers.h"
  18
  19 #include "sysemu/sysemu.h"
  20
  21 static void gtk_gl_area_set_scanout_mode(VirtualConsole *vc, bool scanout)
  22 {
  23     if (vc->gfx.scanout_mode == scanout) {
  24         return;
  25     }
  26
  27     vc->gfx.scanout_mode = scanout;
  28     if (!vc->gfx.scanout_mode) {
  29         if (vc->gfx.fbo_id) {
  30             glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  31                                       GL_COLOR_ATTACHMENT0_EXT,
  32                                       GL_TEXTURE_2D, 0, 0);
  33             glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
  34             glDeleteFramebuffers(1, &vc->gfx.fbo_id);
  35             vc->gfx.fbo_id = 0;
  36         }
  37         if (vc->gfx.surface) {
  38             surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
  39             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
  40         }
  41     }
  42 }
  43
  44 /** DisplayState Callbacks (opengl version) **/
  45
  46 void gd_gl_area_draw(VirtualConsole *vc)
  47 {
  48     int ww, wh, y1, y2;
  49
  50     if (!vc->gfx.gls) {
  51         return;
  52     }
  53
  54     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
  55     ww = gtk_widget_get_allocated_width(vc->gfx.drawing_area);
  56     wh = gtk_widget_get_allocated_height(vc->gfx.drawing_area);
  57
  58     if (vc->gfx.scanout_mode) {
  59         if (!vc->gfx.fbo_id) {
  60             return;
  61         }
  62
  63         glBindFramebuffer(GL_READ_FRAMEBUFFER, vc->gfx.fbo_id);
  64         /* GtkGLArea sets GL_DRAW_FRAMEBUFFER for us */
  65
  66         glViewport(0, 0, ww, wh);
  67         y1 = vc->gfx.y0_top ? 0 : vc->gfx.h;
  68         y2 = vc->gfx.y0_top ? vc->gfx.h : 0;
  69         glBlitFramebuffer(0, y1, vc->gfx.w, y2,
  70                           0, 0, ww, wh,
  71                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
  72     } else {
  73         if (!vc->gfx.ds) {
  74             return;
  75         }
  76         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
  77
  78         surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, ww, wh);
  79         surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
  80     }
  81 }
  82
  83 void gd_gl_area_update(DisplayChangeListener *dcl,
  84                    int x, int y, int w, int h)
  85 {
  86     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
  87
  88     if (!vc->gfx.gls || !vc->gfx.ds) {
  89         return;
  90     }
  91
  92     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
  93     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
  94     vc->gfx.glupdates++;
  95 }
  96
  97 void gd_gl_area_refresh(DisplayChangeListener *dcl)
  98 {
  99     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 100
 101     if (!vc->gfx.gls) {
 102         if (!gtk_widget_get_realized(vc->gfx.drawing_area)) {
 103             return;
 104         }
 105         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
 106         vc->gfx.gls = console_gl_init_context();
 107         if (vc->gfx.ds) {
 108             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
 109         }
 110     }
 111
 112     graphic_hw_update(dcl->con);
 113
 114     if (vc->gfx.glupdates) {
 115         vc->gfx.glupdates = 0;
 116         gtk_gl_area_set_scanout_mode(vc, false);
 117         gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
 118     }
 119 }
 120
 121 void gd_gl_area_switch(DisplayChangeListener *dcl,
 122                        DisplaySurface *surface)
 123 {
 124     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 125     bool resized = true;
 126
 127     trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
 128
 129     if (vc->gfx.ds &&
 130         surface_width(vc->gfx.ds) == surface_width(surface) &&
 131         surface_height(vc->gfx.ds) == surface_height(surface)) {
 132         resized = false;
 133     }
 134
 135     if (vc->gfx.gls) {
 136         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
 137         surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
 138         surface_gl_create_texture(vc->gfx.gls, surface);
 139     }
 140     vc->gfx.ds = surface;
 141
 142     if (resized) {
 143         gd_update_windowsize(vc);
 144     }
 145 }
 146
 147 QEMUGLContext gd_gl_area_create_context(DisplayChangeListener *dcl,
 148                                         QEMUGLParams *params)
 149 {
 150     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 151     GdkWindow *window;
 152     GdkGLContext *ctx;
 153     GError *err = NULL;
 154
 155     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
 156     window = gtk_widget_get_window(vc->gfx.drawing_area);
 157     ctx = gdk_window_create_gl_context(window, &err);
 158     gdk_gl_context_set_required_version(ctx,
 159                                         params->major_ver,
 160                                         params->minor_ver);
 161     gdk_gl_context_realize(ctx, &err);
 162     return ctx;
 163 }
 164
 165 void gd_gl_area_destroy_context(DisplayChangeListener *dcl, QEMUGLContext ctx)
 166 {
 167     /* FIXME */
 168 }
 169
 170 void gd_gl_area_scanout_texture(DisplayChangeListener *dcl,
 171                                 uint32_t backing_id,
 172                                 bool backing_y_0_top,
 173                                 uint32_t backing_width,
 174                                 uint32_t backing_height,
 175                                 uint32_t x, uint32_t y,
 176                                 uint32_t w, uint32_t h)
 177 {
 178     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 179
 180     vc->gfx.x = x;
 181     vc->gfx.y = y;
 182     vc->gfx.w = w;
 183     vc->gfx.h = h;
 184     vc->gfx.tex_id = backing_id;
 185     vc->gfx.y0_top = backing_y_0_top;
 186
 187     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
 188
 189     if (vc->gfx.tex_id == 0 || vc->gfx.w == 0 || vc->gfx.h == 0) {
 190         gtk_gl_area_set_scanout_mode(vc, false);
 191         return;
 192     }
 193
 194     gtk_gl_area_set_scanout_mode(vc, true);
 195     if (!vc->gfx.fbo_id) {
 196         glGenFramebuffers(1, &vc->gfx.fbo_id);
 197     }
 198
 199     glBindFramebuffer(GL_FRAMEBUFFER_EXT, vc->gfx.fbo_id);
 200     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
 201                               GL_TEXTURE_2D, vc->gfx.tex_id, 0);
 202 }
 203
 204 void gd_gl_area_scanout_flush(DisplayChangeListener *dcl,
 205                           uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 206 {
 207     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 208
 209     gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
 210 }
 211
 212 void gtk_gl_area_init(void)
 213 {
 214     display_opengl = 1;
 215 }
 216
 217 QEMUGLContext gd_gl_area_get_current_context(DisplayChangeListener *dcl)
 218 {
 219     return gdk_gl_context_get_current();
 220 }
 221
 222 int gd_gl_area_make_current(DisplayChangeListener *dcl,
 223                             QEMUGLContext ctx)
 224 {
 225     gdk_gl_context_make_current(ctx);
 226     return 0;
 227 }