Use triangle strips for drawing surfaces.

diff --git a/egl-compositor.c b/egl-compositor.c
index e4f838a..09793b8 100644 (file)
--- a/egl-compositor.c
+++ b/egl-compositor.c
@@ -40,7 +40,7 @@ repaint(void *data)
        struct wl_surface *surface;
        struct surface_data *sd;
        GLint vertices[12];
-       GLint tex_coords[8] = { 1, 0,  1, 1,  0, 1,  0, 0 };
+       GLint tex_coords[8] = { 1, 0,  1, 1,  0, 0,  0, 1 };
        GLuint indices[4] = { 0, 1, 2, 3 };
               
        /* This part is where we actually copy the buffer to screen.
@@ -64,11 +64,11 @@ repaint(void *data)
                vertices[5] = 0;
 
                vertices[6] = sd->map.x + sd->map.width;
-               vertices[7] = sd->map.y + sd->map.height;
+               vertices[7] = sd->map.y;
                vertices[8] = 0;
 
                vertices[9] = sd->map.x + sd->map.width;
-               vertices[10] = sd->map.y;
+               vertices[10] = sd->map.y + sd->map.height;
                vertices[11] = 0;
 
                glBindTexture(GL_TEXTURE_2D, sd->texture);
@@ -80,7 +80,7 @@ repaint(void *data)
                glEnableClientState(GL_TEXTURE_COORD_ARRAY);
                glVertexPointer(3, GL_INT, 0, vertices);
                glTexCoordPointer(2, GL_INT, 0, tex_coords);
-               glDrawElements(GL_QUADS, 4, GL_UNSIGNED_INT, indices);
+               glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_INT, indices);
        }
        wl_surface_iterator_destroy(iterator);