sdl: handle activate events

[libpicofe.git] / gl.c

diff --git a/gl.c b/gl.c
index 2360a0c..92b39f7 100644 (file)
--- a/gl.c
+++ b/gl.c
@@ -136,22 +136,24 @@ int gl_flip(const void *fb, int w, int h)
 {
        static int old_w, old_h;
 
-       if (w != old_w || h != old_h) {
-               float f_w = (float)w / 1024.0f;
-               float f_h = (float)h / 512.0f;
-               texture[1*2 + 0] = f_w;
-               texture[2*2 + 1] = f_h;
-               texture[3*2 + 0] = f_w;
-               texture[3*2 + 1] = f_h;
-               old_w = w;
-               old_h = h;
+       if (fb != NULL) {
+               if (w != old_w || h != old_h) {
+                       float f_w = (float)w / 1024.0f;
+                       float f_h = (float)h / 512.0f;
+                       texture[1*2 + 0] = f_w;
+                       texture[2*2 + 1] = f_h;
+                       texture[3*2 + 0] = f_w;
+                       texture[3*2 + 1] = f_h;
+                       old_w = w;
+                       old_h = h;
+               }
+
+               glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
+                       GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
+               if (gl_have_error("glTexSubImage2D"))
+                       return -1;
        }
 
-       glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
-               GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
-       if (gl_have_error("glTexSubImage2D"))
-               return -1;
-
        glVertexPointer(3, GL_FLOAT, 0, vertices);
        glTexCoordPointer(2, GL_FLOAT, 0, texture);
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);