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example: extract helpers into separate file

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Simon Ser 2019-09-25 14:08:07 +03:00
parent 42b58e8802
commit a7128585fe
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GPG key ID: 0FDE7BE0E88F5E48
4 changed files with 115 additions and 97 deletions
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98
example/common.c Normal file
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#include <drm_fourcc.h>
#include <stddef.h>
#include <sys/mman.h>
#include <xf86drm.h>
#include "common.h"
drmModeConnector *pick_connector(int drm_fd, drmModeRes *drm_res)
{
int i;
drmModeConnector *connector;
for (i = 0; i < drm_res->count_connectors; i++) {
connector = drmModeGetConnector(drm_fd, drm_res->connectors[i]);
if (connector->connection == DRM_MODE_CONNECTED) {
return connector;
}
drmModeFreeConnector(connector);
}
return NULL;
}
drmModeCrtc *pick_crtc(int drm_fd, drmModeRes *drm_res,
drmModeConnector *connector)
{
drmModeEncoder *enc;
uint32_t crtc_id;
/* TODO: don't blindly use current CRTC */
enc = drmModeGetEncoder(drm_fd, connector->encoder_id);
crtc_id = enc->crtc_id;
drmModeFreeEncoder(enc);
return drmModeGetCrtc(drm_fd, crtc_id);
}
void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res, uint32_t crtc_id)
{
int i;
for (i = 0; i < drm_res->count_crtcs; i++) {
if (drm_res->crtcs[i] == crtc_id) {
continue;
}
drmModeSetCrtc(drm_fd, drm_res->crtcs[i],
0, 0, 0, NULL, 0, NULL);
}
}
uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha)
{
int ret;
uint32_t fb_id;
uint32_t *data;
size_t i;
struct drm_mode_create_dumb create = {
.width = width,
.height = height,
.bpp = 32,
.flags = 0,
};
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
if (ret < 0) {
return 0;
}
uint32_t fmt = with_alpha ? DRM_FORMAT_ARGB8888 : DRM_FORMAT_XRGB8888;
uint32_t handles[4] = { create.handle };
uint32_t strides[4] = { create.pitch };
uint32_t offsets[4] = { 0 };
ret = drmModeAddFB2(drm_fd, width, height, fmt, handles, strides,
offsets, &fb_id, 0);
if (ret < 0) {
return 0;
}
struct drm_mode_map_dumb map = { .handle = create.handle };
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
if (ret < 0) {
return 0;
}
data = mmap(0, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
map.offset);
if (data == MAP_FAILED) {
return 0;
}
for (i = 0; i < create.size / sizeof(uint32_t); i++) {
data[i] = color;
}
munmap(data, create.size);
return fb_id;
}

15
example/common.h Normal file
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#ifndef EXAMPLE_COMMON_H
#define EXAMPLE_COMMON_H
#include <stdbool.h>
#include <stdint.h>
#include <xf86drmMode.h>
drmModeConnector *pick_connector(int drm_fd, drmModeRes *drm_res);
drmModeCrtc *pick_crtc(int drm_fd, drmModeRes *drm_res,
drmModeConnector *connector);
void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res, uint32_t crtc_id);
uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha);
#endif

2
example/meson.build
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@ -1,5 +1,5 @@
executable(
'simple',
files('simple.c'),
files('common.c', 'simple.c'),
dependencies: [liftoff],
)

97
example/simple.c
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@ -6,102 +6,7 @@
#include <unistd.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <sys/mman.h>
#include <drm_fourcc.h>
static drmModeConnector *pick_connector(int drm_fd, drmModeRes *drm_res)
{
int i;
drmModeConnector *connector;
for (i = 0; i < drm_res->count_connectors; i++) {
connector = drmModeGetConnector(drm_fd, drm_res->connectors[i]);
if (connector->connection == DRM_MODE_CONNECTED) {
return connector;
}
drmModeFreeConnector(connector);
}
return NULL;
}
static drmModeCrtc *pick_crtc(int drm_fd, drmModeRes *drm_res,
drmModeConnector *connector)
{
drmModeEncoder *enc;
uint32_t crtc_id;
/* TODO: don't blindly use current CRTC */
enc = drmModeGetEncoder(drm_fd, connector->encoder_id);
crtc_id = enc->crtc_id;
drmModeFreeEncoder(enc);
return drmModeGetCrtc(drm_fd, crtc_id);
}
static void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res,
uint32_t crtc_id)
{
int i;
for (i = 0; i < drm_res->count_crtcs; i++) {
if (drm_res->crtcs[i] == crtc_id) {
continue;
}
drmModeSetCrtc(drm_fd, drm_res->crtcs[i],
0, 0, 0, NULL, 0, NULL);
}
}
static uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha)
{
int ret;
uint32_t fb_id;
uint32_t *data;
size_t i;
struct drm_mode_create_dumb create = {
.width = width,
.height = height,
.bpp = 32,
.flags = 0,
};
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
if (ret < 0) {
return 0;
}
uint32_t fmt = with_alpha ? DRM_FORMAT_ARGB8888 : DRM_FORMAT_XRGB8888;
uint32_t handles[4] = { create.handle };
uint32_t strides[4] = { create.pitch };
uint32_t offsets[4] = { 0 };
ret = drmModeAddFB2(drm_fd, width, height, fmt, handles, strides,
offsets, &fb_id, 0);
if (ret < 0) {
return 0;
}
struct drm_mode_map_dumb map = { .handle = create.handle };
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
if (ret < 0) {
return 0;
}
data = mmap(0, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
map.offset);
if (data == MAP_FAILED) {
return 0;
}
for (i = 0; i < create.size / sizeof(uint32_t); i++) {
data[i] = color;
}
munmap(data, create.size);
return fb_id;
}
#include "common.h"
/* ARGB 8:8:8:8 */
static const uint32_t colors[] = {