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vo_opengl: angle: update the swapchain on resize

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This uses eglPostSubBufferNV to trigger ANGLE to check the window size
and update the size of the swapchain to match, which is recommended
here: https://groups.google.com/d/msg/angleproject/RvyVkjRCQGU/gfKfT64IAgAJ

With the D3D11 backend, using eglPostSubBufferNV with a 0-sized update
region will even skip the Present() call, meaning it won't block for a
vsync period. Hopefully ANGLE will have a less hacky way of doing this
in future. See the relevant ANGLE issue: http://anglebug.com/1438

Fixes #3301
This commit is contained in:
James Ross-Gowan 2016-07-04 21:38:36 +10:00
parent f98e1b0b96
commit 6a3da439cd
1 changed files with 16 additions and 1 deletions
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17
video/out/opengl/context_angle.c
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@ -38,6 +38,7 @@ struct priv {
EGLContext egl_context;
EGLSurface egl_surface;
bool use_es2;
PFNEGLPOSTSUBBUFFERNVPROC eglPostSubBufferNV;
};
static void angle_uninit(MPGLContext *ctx)
@ -288,6 +289,11 @@ static int angle_init(struct MPGLContext *ctx, int flags)
// Configure the underlying Direct3D device
d3d_init(ctx);
if (strstr(exts, "EGL_NV_post_sub_buffer")) {
p->eglPostSubBufferNV =
(PFNEGLPOSTSUBBUFFERNVPROC)eglGetProcAddress("eglPostSubBufferNV");
}
mpgl_load_functions(ctx->gl, get_proc_address, NULL, vo->log);
return 0;
@ -315,7 +321,16 @@ static int angle_reconfig(struct MPGLContext *ctx)
static int angle_control(MPGLContext *ctx, int *events, int request, void *arg)
{
return vo_w32_control(ctx->vo, events, request, arg);
struct priv *p = ctx->priv;
int r = vo_w32_control(ctx->vo, events, request, arg);
// Calling eglPostSubBufferNV with a 0-sized region doesn't present a frame
// or block, but it does update the swapchain to match the window size
// See: https://groups.google.com/d/msg/angleproject/RvyVkjRCQGU/gfKfT64IAgAJ
if ((*events & VO_EVENT_RESIZE) && p->eglPostSubBufferNV)
p->eglPostSubBufferNV(p->egl_display, p->egl_surface, 0, 0, 0, 0);
return r;
}
static void angle_swap_buffers(MPGLContext *ctx)