diff options
Diffstat (limited to 'minuitwrp/graphics.c')
| -rw-r--r-- | minuitwrp/graphics.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/minuitwrp/graphics.c b/minuitwrp/graphics.c index b30a92ef0..dc79db881 100644 --- a/minuitwrp/graphics.c +++ b/minuitwrp/graphics.c @@ -51,6 +51,8 @@ #define PIXEL_SIZE 2 #endif +#define NUM_BUFFERS 2 + // #define PRINT_SCREENINFO 1 // Enables printing of screen info to log typedef struct { @@ -63,9 +65,10 @@ typedef struct { static GRFont *gr_font = 0; static GGLContext *gr_context = 0; static GGLSurface gr_font_texture; -static GGLSurface gr_framebuffer[2]; +static GGLSurface gr_framebuffer[NUM_BUFFERS]; static GGLSurface gr_mem_surface; static unsigned gr_active_fb = 0; +static unsigned double_buffering = 0; static int gr_fb_fd = -1; static int gr_vt_fd = -1; @@ -199,6 +202,12 @@ static int get_framebuffer(GGLSurface *fb) fb++; + /* check if we can use double buffering */ + if (vi.yres * fi.line_length * 2 > fi.smem_len) + return fd; + + double_buffering = 1; + fb->version = sizeof(*fb); fb->width = vi.xres; fb->height = vi.yres; @@ -230,8 +239,8 @@ static void get_memory_surface(GGLSurface* ms) { static void set_active_framebuffer(unsigned n) { - if (n > 1) return; - vi.yres_virtual = vi.yres * 2; + if (n > 1 || !double_buffering) return; + vi.yres_virtual = vi.yres * NUM_BUFFERS; vi.yoffset = n * vi.yres; // vi.bits_per_pixel = PIXEL_SIZE * 8; if (ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) { @@ -244,7 +253,8 @@ void gr_flip(void) GGLContext *gl = gr_context; /* swap front and back buffers */ - gr_active_fb = (gr_active_fb + 1) & 1; + if (double_buffering) + gr_active_fb = (gr_active_fb + 1) & 1; #ifdef BOARD_HAS_FLIPPED_SCREEN /* flip buffer 180 degrees for devices with physicaly inverted screens */ |