d3d9: implement scissor test

gfx/common/d3d9_common.h

@@ -457,6 +457,12 @@ static INLINE void d3d9_set_viewports(LPDIRECT3DDEVICE9 dev,
       IDirect3DDevice9_SetViewport(dev, (D3DVIEWPORT9*)vp);
 }
 
+static INLINE void d3d9_set_scissor_rect(
+      LPDIRECT3DDEVICE9 dev, RECT *rect)
+{
+   IDirect3DDevice9_SetScissorRect(dev, rect);
+}
+
 static INLINE void d3d9_set_render_state(
       LPDIRECT3DDEVICE9 dev, D3DRENDERSTATETYPE state, DWORD value)
 {

gfx/drivers/d3d9.c

@@ -1033,6 +1033,7 @@ static bool d3d9_initialize(d3d9_video_t *d3d, const video_info_t *info)
    d3d_matrix_transpose(&d3d->mvp, &d3d->mvp_transposed);
 
    d3d9_set_render_state(d3d->dev, D3DRS_CULLMODE, D3DCULL_NONE);
+   d3d9_set_render_state(d3d->dev, D3DRS_SCISSORTESTENABLE, TRUE);
 
    return true;
 }

menu/drivers_display/menu_display_d3d9.c

@@ -309,6 +309,40 @@ static bool menu_display_d3d9_font_init_first(
    return true;
 }
 
+void menu_display_d3d9_scissor_begin(video_frame_info_t *video_info, int x, int y, unsigned width, unsigned height)
+{
+   RECT rect = {0};
+   d3d9_video_t *d3d9 = video_info ?
+      (d3d9_video_t*)video_info->userdata : NULL;
+
+   rect.left = x;
+   rect.top = y;
+   rect.right = width + x;
+   rect.bottom = height + y;
+
+   if (!d3d9 || !width || !height)
+      return;
+
+   d3d9_set_scissor_rect(d3d9->dev, &rect);
+}
+
+void menu_display_d3d9_scissor_end(video_frame_info_t *video_info)
+{
+   RECT rect = {0};
+   d3d9_video_t *d3d9 = video_info ?
+      (d3d9_video_t*)video_info->userdata : NULL;
+
+   if (!d3d9)
+      return;
+
+   rect.left = d3d9->vp.x;
+   rect.top = d3d9->vp.y;
+   rect.right = d3d9->vp.width;
+   rect.bottom = d3d9->vp.height;
+
+   d3d9_set_scissor_rect(d3d9->dev, &rect);
+}
+
 menu_display_ctx_driver_t menu_display_ctx_d3d9 = {
    menu_display_d3d9_draw,
    menu_display_d3d9_draw_pipeline,
@@ -324,6 +358,6 @@ menu_display_ctx_driver_t menu_display_ctx_d3d9 = {
    MENU_VIDEO_DRIVER_DIRECT3D9,
    "d3d9",
    false,
-   NULL,
+   menu_display_d3d9_scissor_begin,
-   NULL
+   menu_display_d3d9_scissor_end
 };