sdl2: add support for display rendering using opengl.

Add new sdl2-gl.c file, with display
rendering functions using opengl.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
new file mode 100644
index 0000000000..b604c0671e
--- /dev/null
+++ b/ui/sdl2-gl.c
@@ -0,0 +1,112 @@
+/*
+ * QEMU SDL display driver -- opengl support
+ *
+ * Copyright (c) 2014 Red Hat
+ *
+ * Authors:
+ *     Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu-common.h"
+#include "ui/console.h"
+#include "ui/input.h"
+#include "ui/sdl2.h"
+#include "sysemu/sysemu.h"
+
+static void sdl2_gl_render_surface(struct sdl2_console *scon)
+{
+    int ww, wh;
+
+    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
+
+    SDL_GetWindowSize(scon->real_window, &ww, &wh);
+    surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh);
+
+    surface_gl_render_texture(scon->gls, scon->surface);
+    SDL_GL_SwapWindow(scon->real_window);
+}
+
+void sdl2_gl_update(DisplayChangeListener *dcl,
+                    int x, int y, int w, int h)
+{
+    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
+
+    assert(scon->opengl);
+
+    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
+    surface_gl_update_texture(scon->gls, scon->surface, x, y, w, h);
+    scon->updates++;
+}
+
+void sdl2_gl_switch(DisplayChangeListener *dcl,
+                    DisplaySurface *new_surface)
+{
+    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
+    DisplaySurface *old_surface = scon->surface;
+
+    assert(scon->opengl);
+
+    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
+    surface_gl_destroy_texture(scon->gls, scon->surface);
+
+    scon->surface = new_surface;
+
+    if (!new_surface) {
+        console_gl_fini_context(scon->gls);
+        scon->gls = NULL;
+        sdl2_window_destroy(scon);
+        return;
+    }
+
+    if (!scon->real_window) {
+        sdl2_window_create(scon);
+        scon->gls = console_gl_init_context();
+    } else if (old_surface &&
+               ((surface_width(old_surface)  != surface_width(new_surface)) ||
+                (surface_height(old_surface) != surface_height(new_surface)))) {
+        sdl2_window_resize(scon);
+    }
+
+    surface_gl_create_texture(scon->gls, scon->surface);
+}
+
+void sdl2_gl_refresh(DisplayChangeListener *dcl)
+{
+    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
+
+    assert(scon->opengl);
+
+    graphic_hw_update(dcl->con);
+    if (scon->updates && scon->surface) {
+        scon->updates = 0;
+        sdl2_gl_render_surface(scon);
+    }
+    sdl2_poll_events(scon);
+}
+
+void sdl2_gl_redraw(struct sdl2_console *scon)
+{
+    assert(scon->opengl);
+
+    if (scon->surface) {
+        sdl2_gl_render_surface(scon);
+    }
+}