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5 commits

Author SHA1 Message Date
3f1670809c cleanup 2023-04-02 16:59:07 +02:00
6aef8f92d7 move everything to functions 2023-04-02 16:53:04 +02:00
ef25392907 cleanup 2023-04-02 16:39:06 +02:00
e7df6a2776 display cursor position 2023-04-02 15:38:27 +02:00
2242c2c824 grab entire screen(s), lower framerate 2023-04-02 14:54:44 +02:00

View file

@ -1,113 +1,142 @@
#include <signal.h>
#include <assert.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/Xutil.h>
#include <GLFW/glfw3.h>
#include "openvr/openvr.h"
static vr::ETrackingUniverseOrigin TRACKING_UNIVERSE = vr::ETrackingUniverseOrigin::TrackingUniverseStanding;
auto TRACKING_UNIVERSE = vr::ETrackingUniverseOrigin::TrackingUniverseStanding;
#define WIDTH 1024
#define HEIGHT 1024
#define FRAMERATE 30
uint16_t width;
uint16_t height;
bool should_exit = false;
Display *xdisplay;
Window root_window;
vr::IVRSystem *ovr_sys;
vr::IVROverlay *ovr_overlay;
vr::VROverlayHandle_t handle;
vr::VROverlayHandle_t main_overlay;
vr::Texture_t vr_texture;
GLuint overlaytexture;
GLuint screen_texture;
GLFWwindow *gl_window;
void cleanup(int _sig = 0);
int main(int argc, char **argv)
void init_x11()
{
signal(SIGINT, cleanup);
{
xdisplay = XOpenDisplay(nullptr);
assert(xdisplay != nullptr);
printf("Created X11 display\n");
root_window = XRootWindow(xdisplay, 0);
}
{
assert(glfwInit() == true);
glfwWindowHint(GLFW_VISIBLE, false);
gl_window = glfwCreateWindow(WIDTH, HEIGHT, "Overlay", nullptr, nullptr);
assert(gl_window != nullptr);
glfwMakeContextCurrent(gl_window);
printf("Created GLFW context\n");
}
{
vr::EVRInitError init_err;
ovr_sys = vr::VR_Init(&init_err, vr::EVRApplicationType::VRApplication_Overlay);
assert(init_err == 0);
ovr_overlay = vr::VROverlay();
printf("Initialized openvr overlay\n");
}
{
auto overlay_err = ovr_overlay->CreateOverlay("deskpot", "Desktop view", &handle);
assert(overlay_err == 0);
ovr_overlay->ShowOverlay(handle);
ovr_overlay->SetOverlayTextureColorSpace(handle, vr::EColorSpace::ColorSpace_Gamma);
ovr_overlay->SetOverlayWidthInMeters(handle, 0.5f);
uint8_t col[4] = {20, 100, 100, 255};
ovr_overlay->SetOverlayRaw(handle, &col, 1, 1, 4);
printf("Created overlay instance\n");
}
{
vr::HmdMatrix34_t transform;
auto err = ovr_overlay->GetOverlayTransformAbsolute(handle, &TRACKING_UNIVERSE, &transform);
assert(err == 0);
transform.m[1][1] = -1;
err = ovr_overlay->SetOverlayTransformAbsolute(handle, TRACKING_UNIVERSE, &transform);
assert(err == 0);
}
{
glGenTextures(1, &overlaytexture);
glBindTexture(GL_TEXTURE_2D, overlaytexture);
}
vr::Texture_t vr_texture;
vr_texture.eColorSpace = vr::EColorSpace::ColorSpace_Auto;
vr_texture.eType = vr::ETextureType::TextureType_OpenGL;
while (1)
{
auto frame = XGetImage(xdisplay, root_window, 0, 0, WIDTH, HEIGHT, AllPlanes, ZPixmap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WIDTH, HEIGHT, 0, GL_BGRA, GL_UNSIGNED_BYTE, frame->data);
XDestroyImage(frame);
{
vr_texture.handle = (void *)(uintptr_t)overlaytexture;
auto set_err = ovr_overlay->SetOverlayTexture(handle, &vr_texture);
if (set_err)
{
printf("error setting texture: %d\n", set_err);
assert(set_err == 0);
}
}
glfwSwapBuffers(gl_window);
ovr_overlay->WaitFrameSync(20);
}
cleanup();
return 0;
xdisplay = XOpenDisplay(nullptr);
assert(xdisplay != nullptr);
printf("Created X11 display\n");
root_window = XRootWindow(xdisplay, 0);
XWindowAttributes attributes;
XGetWindowAttributes(xdisplay, root_window, &attributes);
width = attributes.width;
height = attributes.height;
}
void cleanup(int _sig)
void init_glfw()
{
assert(glfwInit() == true);
glfwWindowHint(GLFW_VISIBLE, false);
gl_window = glfwCreateWindow(width, height, "Overlay", nullptr, nullptr);
assert(gl_window != nullptr);
glfwMakeContextCurrent(gl_window);
printf("Created GLFW context\n");
glGenTextures(1, &screen_texture);
glBindTexture(GL_TEXTURE_2D, screen_texture);
vr_texture.eColorSpace = vr::EColorSpace::ColorSpace_Auto;
vr_texture.eType = vr::ETextureType::TextureType_OpenGL;
vr_texture.handle = (void *)(uintptr_t)screen_texture;
}
void init_vr()
{
vr::EVRInitError init_err;
ovr_sys = vr::VR_Init(&init_err, vr::EVRApplicationType::VRApplication_Overlay);
assert(init_err == 0);
ovr_overlay = vr::VROverlay();
printf("Initialized openvr overlay\n");
}
void init_overlay()
{
auto overlay_err = ovr_overlay->CreateOverlay("deskpot", "Desktop view", &main_overlay);
assert(overlay_err == 0);
ovr_overlay->ShowOverlay(main_overlay);
ovr_overlay->SetOverlayWidthInMeters(main_overlay, 2.5f);
uint8_t col[4] = {20, 50, 50, 255};
ovr_overlay->SetOverlayRaw(main_overlay, &col, 1, 1, 4);
printf("Created overlay instance\n");
vr::HmdMatrix34_t transform;
auto err = ovr_overlay->GetOverlayTransformAbsolute(main_overlay, &TRACKING_UNIVERSE, &transform);
assert(err == 0);
transform.m[1][1] = -1; // flip Y axis
err = ovr_overlay->SetOverlayTransformAbsolute(main_overlay, TRACKING_UNIVERSE, &transform);
assert(err == 0);
}
void render_desktop()
{
auto frame = XGetImage(xdisplay, root_window, 0, 0, width, height, AllPlanes, ZPixmap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, frame->data);
XDestroyImage(frame);
auto set_err = ovr_overlay->SetOverlayTexture(main_overlay, &vr_texture);
// if (set_err)
// printf("error setting texture: %d\n", set_err);
assert(set_err == 0);
}
void update_cursor()
{
int pix_x, pix_y;
{
Window _t1;
int _t2;
unsigned int _t3;
XQueryPointer(xdisplay, root_window, &_t1, &_t1, &pix_x, &pix_y, &_t2, &_t2, &_t3);
}
// TODO: make this work when aspect ratio is >1 (root window is taller than it is wide)
float ratio = (float)height / (float)width;
float top_edge = 0.5f - ratio / 2.0f;
float x = pix_x / (float)width;
float y = pix_y / (float)width + top_edge;
auto pos = vr::HmdVector2_t{x, y};
ovr_overlay->SetOverlayCursorPositionOverride(main_overlay, &pos);
}
void interrupted(int _sig)
{
should_exit = true;
}
int main()
{
signal(SIGINT, interrupted);
init_x11();
init_glfw();
init_vr();
init_overlay();
while (!should_exit)
{
render_desktop();
update_cursor();
glfwSwapBuffers(gl_window);
usleep(1000000 / FRAMERATE);
}
printf("\nShutting down\n");
vr::VR_Shutdown();
glfwDestroyWindow(gl_window);
glfwTerminate();
exit(0);
}
return 0;
}