[Qemu-devel] [PATCH 2/4] console: add opengl rendering helper functions

[Gerd Hoffmann <kraxel@redhat.com>]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/ui/console.h |  23 ++++++++++
 ui/Makefile.objs     |   5 ++
 ui/console-gl.c      | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 ui/console-gl.c

diff --git a/include/ui/console.h b/include/ui/console.h
index 22ef8ca..5cb169c 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -9,6 +9,11 @@
 #include "qapi-types.h"
 #include "qapi/error.h"
 
+#ifdef CONFIG_OPENGL
+#include <GL/gl.h>
+#include <GL/glext.h>
+#endif
+
 /* keyboard/mouse support */
 
 #define MOUSE_EVENT_LBUTTON 0x01
@@ -118,6 +123,11 @@ struct DisplaySurface {
     pixman_format_code_t format;
     pixman_image_t *image;
     uint8_t flags;
+#ifdef CONFIG_OPENGL
+    GLenum glformat;
+    GLenum gltype;
+    GLuint texture;
+#endif
 };
 
 typedef struct QemuUIInfo {
@@ -320,6 +330,19 @@ void qemu_console_copy(QemuConsole *con, int src_x, int src_y,
 DisplaySurface *qemu_console_surface(QemuConsole *con);
 DisplayState *qemu_console_displaystate(QemuConsole *console);
 
+#ifdef CONFIG_OPENGL
+/* console-gl.c */
+bool console_gl_check_format(DisplayChangeListener *dcl,
+                             pixman_format_code_t format);
+void surface_gl_create_texture(DisplaySurface *surface);
+void surface_gl_update_texture(DisplaySurface *surface,
+                               int x, int y, int w, int h);
+void surface_gl_render_texture(DisplaySurface *surface);
+void surface_gl_destroy_texture(DisplaySurface *surface);
+void surface_gl_setup_viewport(DisplaySurface *surface,
+                               int ww, int wh);
+#endif
+
 /* sdl.c */
 void sdl_display_init(DisplayState *ds, int full_screen, int no_frame);
 
diff --git a/ui/Makefile.objs b/ui/Makefile.objs
index 13b5cfb..3173778 100644
--- a/ui/Makefile.objs
+++ b/ui/Makefile.objs
@@ -24,4 +24,9 @@ sdl.mo-objs := sdl2.o sdl2-input.o sdl2-2d.o
 endif
 sdl.mo-cflags := $(SDL_CFLAGS)
 
+ifeq ($(CONFIG_OPENGL),y)
+common-obj-y += console-gl.o
+libs_softmmu += $(OPENGL_LIBS)
+endif
+
 gtk.o-cflags := $(GTK_CFLAGS) $(VTE_CFLAGS)
diff --git a/ui/console-gl.c b/ui/console-gl.c
new file mode 100644
index 0000000..470dd61
--- /dev/null
+++ b/ui/console-gl.c
@@ -0,0 +1,127 @@
+/*
+ * QEMU graphical console -- opengl helper bits
+ *
+ * Copyright (c) 2004 Fabrice Bellard
+ *
+ * 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"
+
+bool console_gl_check_format(DisplayChangeListener *dcl,
+                             pixman_format_code_t format)
+{
+    switch (format) {
+    case PIXMAN_x8r8g8b8:
+    case PIXMAN_a8r8g8b8:
+    case PIXMAN_r5g6b5:
+        return true;
+    default:
+        return false;
+    }
+}
+
+void surface_gl_create_texture(DisplaySurface *surface)
+{
+    switch (surface->format) {
+    case PIXMAN_x8r8g8b8:
+    case PIXMAN_a8r8g8b8:
+        surface->glformat = GL_BGRA;
+        surface->gltype = GL_UNSIGNED_BYTE;
+        break;
+    case PIXMAN_r5g6b5:
+        surface->glformat = GL_RGB;
+        surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
+        break;
+    default:
+        g_assert_not_reached();
+    }
+
+    glGenTextures(1, &surface->texture);
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, surface->texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
+                 surface_width(surface),
+                 surface_height(surface),
+                 0, surface->glformat, surface->gltype,
+                 surface_data(surface));
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+}
+
+void surface_gl_update_texture(DisplaySurface *surface,
+                               int x, int y, int w, int h)
+{
+    uint8_t *data = (void *)surface_data(surface);
+
+    glTexSubImage2D(GL_TEXTURE_2D, 0,
+                    0, y,
+                    surface_width(surface), h,
+                    surface->glformat, surface->gltype,
+                    data + surface_stride(surface) * y);
+}
+
+void surface_gl_render_texture(DisplaySurface *surface)
+{
+    glClearColor(0.0, 0.0, 0.0, 0);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glBegin(GL_QUADS);
+    glTexCoord2i(0, 1);  glVertex3i(-1, -1, 0);
+    glTexCoord2i(0, 0);  glVertex3i(-1, 1, 0);
+    glTexCoord2i(1, 0);  glVertex3i(1, 1, 0);
+    glTexCoord2i(1, 1);  glVertex3i(1, -1, 0);
+    glEnd();
+}
+
+void surface_gl_destroy_texture(DisplaySurface *surface)
+{
+    if (!surface || !surface->texture) {
+        return;
+    }
+    glDeleteTextures(1, &surface->texture);
+    surface->texture = 0;
+}
+
+void surface_gl_setup_viewport(DisplaySurface *surface,
+                               int ww, int wh)
+{
+    int gw, gh, stripe;
+    float sw, sh;
+
+    gw = surface_width(surface);
+    gh = surface_height(surface);
+
+    sw = (float)ww/gw;
+    sh = (float)wh/gh;
+    if (sw < sh) {
+        stripe = wh - wh*sw/sh;
+        glViewport(0, stripe / 2, ww, wh - stripe);
+    } else {
+        stripe = ww - ww*sh/sw;
+        glViewport(stripe / 2, 0, ww - stripe, wh);
+    }
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
-- 
1.8.3.1