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Clean example

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Bastien
2018-09-22 19:01:05 +02:00
parent 1f7f5e87b2
commit e03a9a5a9f
1 changed files with 23 additions and 100 deletions
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119
examples/opengl/main.c
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@@ -34,7 +34,8 @@ GLuint gen_cubes()
glNewList(list, GL_COMPILE); glNewList(list, GL_COMPILE);
for(float a = 0.0f; a < 360.0f; a += 20.0f){ for (float a = 0.0f; a < 360.0f; a += 20.0f)
{
glPushMatrix(); glPushMatrix();
glRotatef(a, 0, 1, 0); glRotatef(a, 0, 1, 0);
@@ -58,52 +59,19 @@ GLuint gen_cubes()
return list; return list;
} }
void draw_crosshairs(float len, float cx, float cy)
{
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glBegin(GL_LINES);
float l = len/2.0f;
glVertex3f(cx - l, cy, 0.0);
glVertex3f(cx + l, cy, 0.0);
glVertex3f(cx, cy - l, 0.0);
glVertex3f(cx, cy + l, 0.0);
glEnd();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
void draw_scene(GLuint list) void draw_scene(GLuint list)
{ {
// draw cubes // draw cubes
glCallList(list); glCallList(list);
} }
static inline void
print_matrix(float m[])
{
printf("[[%0.4f, %0.4f, %0.4f, %0.4f],\n"
"[%0.4f, %0.4f, %0.4f, %0.4f],\n"
"[%0.4f, %0.4f, %0.4f, %0.4f],\n"
"[%0.4f, %0.4f, %0.4f, %0.4f]]\n",
m[0], m[4], m[8], m[12],
m[1], m[5], m[9], m[13],
m[2], m[6], m[10], m[14],
m[3], m[7], m[11], m[15]);
}
int main(int argc, char** argv) int main(int argc, char** argv)
{ {
int hmd_w, hmd_h;
ohmd_context * ctx = ohmd_ctx_create(); ohmd_context * ctx = ohmd_ctx_create();
int num_devices = ohmd_ctx_probe(ctx); int num_devices = ohmd_ctx_probe(ctx);
if(num_devices < 0){ if (num_devices < 0)
{
printf("failed to probe devices: %s\n", ohmd_ctx_get_error(ctx)); printf("failed to probe devices: %s\n", ohmd_ctx_get_error(ctx));
return 1; return 1;
} }
@@ -112,48 +80,30 @@ int main(int argc, char** argv)
// If OHMD_IDS_AUTOMATIC_UPDATE is set to 0, ohmd_ctx_update() must be called at least 10 times per second. // If OHMD_IDS_AUTOMATIC_UPDATE is set to 0, ohmd_ctx_update() must be called at least 10 times per second.
// It is enabled by default. // It is enabled by default.
int auto_update = 1; int auto_update = 1;
ohmd_device_settings_seti(settings, OHMD_IDS_AUTOMATIC_UPDATE, &auto_update); ohmd_device_settings_seti(settings, OHMD_IDS_AUTOMATIC_UPDATE, &auto_update);
ohmd_device * hmd = ohmd_list_open_device_s(ctx, 0, settings); ohmd_device * hmd = ohmd_list_open_device_s(ctx, 0, settings);
if(!hmd){ if (!hmd)
{
printf("failed to open device: %s\n", ohmd_ctx_get_error(ctx)); printf("failed to open device: %s\n", ohmd_ctx_get_error(ctx));
return 1; return 1;
} }
int hmd_w = 0;
int hmd_h = 0;
ohmd_device_geti(hmd, OHMD_SCREEN_HORIZONTAL_RESOLUTION, &hmd_w); ohmd_device_geti(hmd, OHMD_SCREEN_HORIZONTAL_RESOLUTION, &hmd_w);
ohmd_device_geti(hmd, OHMD_SCREEN_VERTICAL_RESOLUTION, &hmd_h); ohmd_device_geti(hmd, OHMD_SCREEN_VERTICAL_RESOLUTION, &hmd_h);
float ipd;
ohmd_device_getf(hmd, OHMD_EYE_IPD, &ipd);
float viewport_scale[2];
float distortion_coeffs[4];
float aberr_scale[3];
float sep;
float left_lens_center[2];
float right_lens_center[2];
//viewport is half the screen
ohmd_device_getf(hmd, OHMD_SCREEN_HORIZONTAL_SIZE, &(viewport_scale[0]));
viewport_scale[0] /= 2.0f;
ohmd_device_getf(hmd, OHMD_SCREEN_VERTICAL_SIZE, &(viewport_scale[1]));
//distortion coefficients
ohmd_device_getf(hmd, OHMD_UNIVERSAL_DISTORTION_K, &(distortion_coeffs[0]));
ohmd_device_getf(hmd, OHMD_UNIVERSAL_ABERRATION_K, &(aberr_scale[0]));
//calculate lens centers (assuming the eye separation is the distance between the lens centers)
ohmd_device_getf(hmd, OHMD_LENS_HORIZONTAL_SEPARATION, &sep);
ohmd_device_getf(hmd, OHMD_LENS_VERTICAL_POSITION, &(left_lens_center[1]));
ohmd_device_getf(hmd, OHMD_LENS_VERTICAL_POSITION, &(right_lens_center[1]));
left_lens_center[0] = viewport_scale[0] - sep/2.0f;
right_lens_center[0] = sep/2.0f;
//assume calibration was for lens view to which ever edge of screen is further away from lens center
float warp_scale = (left_lens_center[0] > right_lens_center[0]) ? left_lens_center[0] : right_lens_center[0];
float warp_adj = 1.0f;
ohmd_device_settings_destroy(settings); ohmd_device_settings_destroy(settings);
struct lvrcInstance * compositor = lvrcCreateInstance(hmd); struct lvrcInstance * compositor = lvrcCreateInstance(hmd);
const int window_w = hmd_w/2;
const int window_h = hmd_h;
gl_ctx gl; gl_ctx gl;
init_gl(&gl, hmd_w, hmd_h); init_gl(&gl, window_w, window_h);
GLuint list = gen_cubes(); GLuint list = gen_cubes();
@@ -178,9 +128,9 @@ int main(int argc, char** argv)
create_fbo(eye_w, eye_h, &right_fbo, right_color_tex, &right_depth_tex); create_fbo(eye_w, eye_h, &right_fbo, right_color_tex, &right_depth_tex);
bool done = false; bool done = false;
bool crosshair_overlay = false;
while(!done){
while (!done)
{
ohmd_ctx_update(ctx); ohmd_ctx_update(ctx);
lvrcBeginFrame(compositor); lvrcBeginFrame(compositor);
@@ -207,12 +157,6 @@ int main(int argc, char** argv)
glClearColor(0.0, 0.0, 0.0, 1.0); glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw_scene(list); draw_scene(list);
if (crosshair_overlay) {
glClear(GL_DEPTH_BUFFER_BIT);
glLineWidth(2.0*OVERSAMPLE_SCALE);
glColor4f(1.0, 0.5, 0.0, 1.0);
draw_crosshairs(0.1, 2*left_lens_center[0]/viewport_scale[0] - 1.0f, 2*left_lens_center[1]/viewport_scale[1] - 1.0f);
}
// set hmd rotation, for right eye. // set hmd rotation, for right eye.
glMatrixMode(GL_PROJECTION); glMatrixMode(GL_PROJECTION);
@@ -228,12 +172,6 @@ int main(int argc, char** argv)
glViewport(0, 0, eye_w, eye_h); glViewport(0, 0, eye_w, eye_h);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw_scene(list); draw_scene(list);
if (crosshair_overlay) {
glClear(GL_DEPTH_BUFFER_BIT);
glLineWidth(5.0);
glColor4f(1.0, 0.5, 0.0, 1.0);
draw_crosshairs(0.1, 2*right_lens_center[0]/viewport_scale[0] - 1.0f, 2*right_lens_center[1]/viewport_scale[1] - 1.0f);
}
// Clean up common draw state // Clean up common draw state
glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0); glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
@@ -241,7 +179,7 @@ int main(int argc, char** argv)
glDisable(GL_DEPTH_TEST); glDisable(GL_DEPTH_TEST);
// Setup ortho state. // Setup ortho state.
glViewport(0, 0, hmd_w, hmd_h); glViewport(0, 0, window_w, window_h);
glEnable(GL_TEXTURE_2D); glEnable(GL_TEXTURE_2D);
glColor4d(1, 1, 1, 1); glColor4d(1, 1, 1, 1);
@@ -255,26 +193,13 @@ int main(int argc, char** argv)
glBindTexture(GL_TEXTURE_2D, left_color_tex); glBindTexture(GL_TEXTURE_2D, left_color_tex);
glBegin(GL_QUADS); glBegin(GL_QUADS);
glTexCoord2d( 0, 0); glTexCoord2d( 0, 0);
glVertex3d( -1, -1, 0); glVertex3d( -1, -1, 1);
glTexCoord2d( 1, 0); glTexCoord2d( 1, 0);
glVertex3d( 0, -1, 0); glVertex3d( 1, -1, 1);
glTexCoord2d( 1, 1); glTexCoord2d( 1, 1);
glVertex3d( 0, 1, 0); glVertex3d( 1, 1, 1);
glTexCoord2d( 0, 1); glTexCoord2d( 0, 1);
glVertex3d( -1, 1, 0); glVertex3d( -1, 1, 1);
glEnd();
// Draw right eye
glBindTexture(GL_TEXTURE_2D, right_color_tex);
glBegin(GL_QUADS);
glTexCoord2d( 0, 0);
glVertex3d( 0, -1, 0);
glTexCoord2d( 1, 0);
glVertex3d( 1, -1, 0);
glTexCoord2d( 1, 1);
glVertex3d( 1, 1, 0);
glTexCoord2d( 0, 1);
glVertex3d( 0, 1, 0);
glEnd(); glEnd();
// Clean up state. // Clean up state.
@@ -282,8 +207,6 @@ int main(int argc, char** argv)
glDisable(GL_TEXTURE_2D); glDisable(GL_TEXTURE_2D);
glUseProgram(0); glUseProgram(0);
glFinish();
// Da swap-dawup! // Da swap-dawup!
eglSwapBuffers(gl.egl_display, gl.egl_surface); eglSwapBuffers(gl.egl_display, gl.egl_surface);