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KMSDRM_VideoInit: add hints for overriding the default video mode

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This commit is contained in:
cmitu 2019-11-17 08:31:23 +00:00
parent 1509ccac91
commit 6113b056a2
1 changed files with 71 additions and 3 deletions
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74
src/video/kmsdrm/SDL_kmsdrmvideo.c
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@ -145,6 +145,28 @@ KMSDRM_Available(void)
return ret;
}
static drmModeModeInfo *
connector_find_mode(drmModeConnector *connector, const char *mode_str, const unsigned int vrefresh)
{
short i;
drmModeModeInfo *mode;
for (i = 0; i < connector->count_modes; i++) {
mode = &connector->modes[i];
if (!strcmp(mode->name, mode_str)) {
/* If the vertical refresh frequency is not specified then return the
* first mode that match with the name. Else, return the mode that match
* the name and the specified vertical refresh frequency.
*/
if (vrefresh == 0)
return mode;
else if (mode->vrefresh == vrefresh)
return mode;
}
}
return NULL;
}
static void
KMSDRM_Destroy(SDL_VideoDevice * device)
{
@ -350,12 +372,19 @@ KMSDRM_VideoInit(_THIS)
SDL_bool found;
int ret = 0;
char *devname;
const char *crtc_override;
const char *mode_override;
SDL_VideoData *vdata = ((SDL_VideoData *)_this->driverdata);
drmModeRes *resources = NULL;
drmModeConnector *connector = NULL;
drmModeEncoder *encoder = NULL;
SDL_DisplayMode current_mode;
SDL_VideoDisplay display;
const char *mode_line_override;
char *hint_video_mode = NULL;
unsigned short hint_vrefresh=0;
char* p;
drmModeModeInfo *override_mode = NULL;
/* Allocate display internal data */
SDL_DisplayData *data = (SDL_DisplayData *) SDL_calloc(1, sizeof(SDL_DisplayData));
@ -472,9 +501,48 @@ KMSDRM_VideoInit(_THIS)
SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Saved crtc_id %u, fb_id %u, (%u,%u), %ux%u",
vdata->saved_crtc->crtc_id, vdata->saved_crtc->buffer_id, vdata->saved_crtc->x,
vdata->saved_crtc->y, vdata->saved_crtc->width, vdata->saved_crtc->height);
data->crtc_id = encoder->crtc_id;
data->cur_mode = vdata->saved_crtc->mode;
vdata->crtc_id = encoder->crtc_id;
crtc_override = SDL_getenv("SDL_VIDEO_KMSDRM_CRTCID");
if (crtc_override)
data->crtc_id = vdata->crtc_id = SDL_atoi(crtc_override);
else
data->crtc_id = vdata->crtc_id = encoder->crtc_id;
mode_override = SDL_getenv("SDL_VIDEO_KMSDRM_MODEID");
if (mode_override)
data->cur_mode = connector->modes[SDL_atoi(mode_override)];
else
data->cur_mode = vdata->saved_crtc->mode;
mode_line_override = SDL_getenv("SDL_VIDEO_KMSDRM_MODELINE");
if (mode_line_override && !mode_override) {
/* Video mode override, formatted as WxH[@vRefresh] */
SDL_LogInfo(SDL_LOG_CATEGORY_VIDEO,"Override video mode received - %s", mode_line_override);
p = strchr(mode_line_override, '@');
if (p == NULL) {
hint_video_mode =strdup(mode_line_override);
} else {
hint_video_mode = strndup(mode_line_override, (unsigned int)(p - mode_line_override));
hint_vrefresh = strtoul(p + 1, NULL, 10);
}
override_mode = connector_find_mode(connector, hint_video_mode, hint_vrefresh);
if (override_mode) {
if ((*override_mode).hdisplay != data->cur_mode.hdisplay ||
(*override_mode).vdisplay != data->cur_mode.vdisplay ||
(*override_mode).vrefresh != data->cur_mode.vrefresh) {
SDL_LogInfo(SDL_LOG_CATEGORY_VIDEO, "Changing video mode to %dx%d @ %d",(*override_mode).hdisplay, (*override_mode).vdisplay, (*override_mode).vrefresh);
current_mode.w = (*override_mode).hdisplay;
current_mode.h = (*override_mode).vdisplay;
current_mode.refresh_rate = (*override_mode).vrefresh;
data->cur_mode = (*override_mode);
}
} else {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Cannot find a suitable video mode on connector %d for mode %s, using default",
connector->connector_id, mode_line_override);
}
}
// select default mode if this one is not valid
if (vdata->saved_crtc->mode_valid == 0) {