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