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Commit 0e34880c authored by Octavian Purdila's avatar Octavian Purdila Committed by Andrew Boie
Browse files

graphics: add support for "single buffering" 



When we don't have enough video memory for double buffering we
fallback to "single buffering".

Change-Id: I8bfab6d8cd6b54f0cc6c67edc41a4c37d8fbd4ba
Signed-off-by: default avatarOctavian Purdila <octavian.purdila@intel.com>
Signed-off-by: default avatarAndrew Boie <andrew.p.boie@intel.com>
parent ea17e320

minui/graphics.c

+10 −2
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ static GGLSurface gr_font_texture; 
static GGLSurface gr_framebuffer[2];

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;
@@ -139,6 +140,12 @@ 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;
@@ -161,7 +168,7 @@ static void get_memory_surface(GGLSurface* ms) { 


static void set_active_framebuffer(unsigned n)

{

    if (n > 1) return;

    if (n > 1 || !double_buffering) return;

    vi.yres_virtual = vi.yres * PIXEL_SIZE;

    vi.yoffset = n * vi.yres;

    vi.bits_per_pixel = PIXEL_SIZE * 8;
@@ -175,6 +182,7 @@ void gr_flip(void) 
    GGLContext *gl = gr_context;



    /* swap front and back buffers */

    if (double_buffering)

        gr_active_fb = (gr_active_fb + 1) & 1;



    /* copy data from the in-memory surface to the buffer we're about