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Fix how the lens vector is incorporated, fix formatting

This commit is contained in:
wheaney 2024-04-04 10:20:25 -07:00
parent 7c6d7ef84d
commit 88a97542e0
1 changed files with 55 additions and 59 deletions
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40
gnome/breezydesktop@org.xronlinux/IMUAdjust.frag
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@ -45,14 +45,16 @@ vec3 applyLookAhead(
in vec3 velocity, in vec3 velocity,
in vec3 accel, in vec3 accel,
in float t, in float t,
in float t_squared) { in float t_squared
) {
return position + velocity * t + 0.5 * accel * t_squared; return position + velocity * t + 0.5 * accel * t_squared;
} }
vec3 rateOfChange( vec3 rateOfChange(
in vec3 v1, in vec3 v1,
in vec3 v2, in vec3 v2,
in float delta_time) { in float delta_time
) {
return (v1 - v2) / delta_time; return (v1 - v2) / delta_time;
} }
@ -68,7 +70,8 @@ void PS_IMU_Transform(vec4 pos, vec2 texcoord, out vec4 color) {
aspect_ratio /= 2; aspect_ratio /= 2;
lens_y_offset = lens_distance_ratio / 3; lens_y_offset = lens_distance_ratio / 3;
if (right_display) lens_y_offset = -lens_y_offset; if(right_display)
lens_y_offset = -lens_y_offset;
if(sbs_content) { if(sbs_content) {
// source video is SBS, left-half of the screen goes to the left lens, right-half to the right lens // source video is SBS, left-half of the screen goes to the left lens, right-half to the right lens
if(right_display) if(right_display)
@ -109,20 +112,14 @@ void PS_IMU_Transform(vec4 pos, vec2 texcoord, out vec4 color) {
color = texture2D(uDesktopTexture, texcoord); color = texture2D(uDesktopTexture, texcoord);
// } // }
} else { } else {
float lens_fov_z_offset_rads = atan(lens_z_offset/screen_distance); float fov_y_half_width = tan(half_fov_y_rads);
float fov_z_pos = tan(half_fov_z_rads - lens_fov_z_offset_rads) * screen_distance; float fov_y_width = fov_y_half_width * 2;
float fov_z_neg = -tan(half_fov_z_rads + lens_fov_z_offset_rads) * screen_distance; float fov_z_half_width = tan(half_fov_z_rads);
float fov_z_width = fov_z_pos - fov_z_neg; float fov_z_width = fov_z_half_width * 2;
float vec_y = -texcoord.x * fov_y_width + fov_y_half_width;
float lens_fov_y_offset_rads = atan(lens_y_offset/screen_distance); float vec_z = -texcoord.y * fov_z_width + fov_z_half_width;
float fov_y_pos = tan(half_fov_y_rads - lens_fov_y_offset_rads) * screen_distance;
float fov_y_neg = -tan(half_fov_y_rads + lens_fov_y_offset_rads) * screen_distance;
float fov_y_width = fov_y_pos - fov_y_neg;
float vec_x = screen_distance;
float vec_y = -texcoord.x * fov_y_width + fov_y_pos;
float vec_z = -texcoord.y * fov_z_width + fov_z_pos;
vec3 texcoord_vector = vec3(vec_x, vec_y, vec_z);
vec3 lens_vector = vec3(lens_distance_ratio, lens_y_offset, lens_z_offset); vec3 lens_vector = vec3(lens_distance_ratio, lens_y_offset, lens_z_offset);
vec3 texcoord_vector = vec3(1.0, vec_y, vec_z);
// then rotate the vector using each of the snapshots provided // then rotate the vector using each of the snapshots provided
vec3 rotated_vector_t0 = applyQuaternionToVector(imu_quat_data[0], texcoord_vector); vec3 rotated_vector_t0 = applyQuaternionToVector(imu_quat_data[0], texcoord_vector);
@ -146,7 +143,8 @@ void PS_IMU_Transform(vec4 pos, vec2 texcoord, out vec4 color) {
float look_ahead_ms_squared = pow(look_ahead_ms, 2); float look_ahead_ms_squared = pow(look_ahead_ms, 2);
// apply most recent velocity and acceleration to most recent position to get a predicted position // apply most recent velocity and acceleration to most recent position to get a predicted position
vec3 res = applyLookAhead(rotated_vector_t0, velocity_t0, accel_t0, look_ahead_ms, look_ahead_ms_squared); vec3 res = applyLookAhead(rotated_vector_t0, velocity_t0, accel_t0, look_ahead_ms, look_ahead_ms_squared) -
rotated_lens_vector;
bool looking_behind = res.x < 0.0; bool looking_behind = res.x < 0.0;
@ -154,14 +152,12 @@ void PS_IMU_Transform(vec4 pos, vec2 texcoord, out vec4 color) {
// so the vector is pointing at a coordinate on the screen // so the vector is pointing at a coordinate on the screen
float display_distance = (sbs_enabled ? display_north_offset : 1.0) - rotated_lens_vector.x; float display_distance = (sbs_enabled ? display_north_offset : 1.0) - rotated_lens_vector.x;
res *= display_distance / res.x; res *= display_distance / res.x;
res += rotated_lens_vector;
// adjust x and y by how much our lens moved from its original offset
res += rotated_lens_vector - lens_vector;
// deconstruct the rotated and scaled vector back to a texcoord (just inverse operations of the first conversion // deconstruct the rotated and scaled vector back to a texcoord (just inverse operations of the first conversion
// above) // above)
texcoord.x = (fov_y_pos - res.y) / fov_y_width; texcoord.x = (fov_y_half_width - res.y) / fov_y_width;
texcoord.y = (fov_z_pos - res.z) / fov_z_width; texcoord.y = (fov_z_half_width - res.z) / fov_z_width;
// apply the screen offsets now // apply the screen offsets now
float texcoord_width = texcoord_x_max - texcoord_x_min; float texcoord_width = texcoord_x_max - texcoord_x_min;