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comp: Choose best mode for direct mode by default

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Best mode means: first maximize the rendered pixels, then maximize the refresh rate.
This commit is contained in:
Christoph Haag 2020-02-14 02:10:33 +01:00 committed by Lubosz Sarnecki
parent 7207c50992
commit 36d6b71e8a
1 changed files with 51 additions and 3 deletions
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54
src/xrt/compositor/main/comp_window_direct_mode.cpp
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@ -383,6 +383,51 @@ static void
comp_window_direct_flush(struct comp_window *w)
{}
static int
choose_best_vk_mode_auto(struct comp_window_direct *w,
VkDisplayModePropertiesKHR *mode_properties,
int mode_count)
{
struct
{
uint16_t width = 0;
uint16_t height = 0;
float refresh = 0;
int index = 0;
} best_mode;
// First priority: choose mode that maximizes rendered pixels.
// Second priority: choose mode with highest refresh rate.
for (int i = 0; i < mode_count; i++) {
VkDisplayModePropertiesKHR props = mode_properties[i];
uint16_t width = props.parameters.visibleRegion.width;
uint16_t height = props.parameters.visibleRegion.height;
float refresh = (float)props.parameters.refreshRate / 1000.;
COMP_DEBUG(w->base.c, "Available Vk direct mode %d: %dx%d@%.2f",
i, width, height, refresh);
int max_pixels = best_mode.width * best_mode.height;
int pixels = width * height;
if (pixels > max_pixels) {
best_mode.index = i;
best_mode.width = width;
best_mode.height = height;
best_mode.refresh = refresh;
} else if (pixels == max_pixels &&
refresh > best_mode.refresh) {
best_mode.index = i;
/* update dims because it might be rotated */
best_mode.width = width;
best_mode.height = height;
best_mode.refresh = refresh;
}
}
COMP_DEBUG(w->base.c, "Auto choosing Vk direct mode %d: %dx%d@%.2f",
best_mode.index, best_mode.width, best_mode.height,
best_mode.refresh);
return best_mode.index;
}
static VkDisplayModeKHR
comp_window_direct_get_primary_display_mode(struct comp_window_direct *w,
VkDisplayKHR display)
@ -414,11 +459,14 @@ comp_window_direct_get_primary_display_mode(struct comp_window_direct *w,
return nullptr;
}
VkDisplayModePropertiesKHR props = mode_properties[0];
int chosen_mode =
choose_best_vk_mode_auto(w, mode_properties, mode_count);
VkDisplayModePropertiesKHR props = mode_properties[chosen_mode];
COMP_DEBUG(w->base.c, "found display mode %d %d",
COMP_DEBUG(w->base.c, "found display mode %dx%d@%.2f",
props.parameters.visibleRegion.width,
props.parameters.visibleRegion.height);
props.parameters.visibleRegion.height,
(float)props.parameters.refreshRate / 1000.);
delete[] mode_properties;