Orkuncakilkaya
19fcf60599
ludic migrate state packages <every example program> packages/ludic.lab/example/plate.ludic 1804 vars into 126 states, 64 into lets; 23498 edits in 460 files Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
91 lines
4.6 KiB
Text
91 lines
4.6 KiB
Text
# ============================================================================
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# camera.ludic — a first-person fly camera (yaw / pitch, metres) and its view /
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# projection matrices. Float bits throughout; see fmath.ludic.
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# ============================================================================
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# the view frustum's four side planes (a, b, c, d), float bits: left, right, bottom, top;
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# from the clean (unjittered) view-projection, column-major m[col * 4 + row]
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function cam_init(render3d_st: mut Render3dState, aspect: float) -> void {
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render3d_st.cam_pos = v3_new(0.0, 2.0, 0.0)
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render3d_st.cam_view = m4_new(); render3d_st.cam_proj = m4_new(); render3d_st.cam_vp = m4_new(); render3d_st.cam_inv_vp = m4_new(); render3d_st.cam_inv_proj = m4_new()
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render3d_st.cam_vp_clean = m4_new(); render3d_st.cam_inv_vp_clean = m4_new()
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render3d_st.cam_fwd = v3_new(0.0, 0.0, -1.0)
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render3d_st.cam_right = v3_new(1.0, 0.0, 0.0)
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render3d_st.cam_fov = Math.deg_to_rad(42.0)
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render3d_st.cam_near = 0.3
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render3d_st.cam_far = 14000.0
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render3d_st.cam_aspect = aspect
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cam_update(render3d_st)
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}
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function cam_begin_frame(render3d_st: mut Render3dState, n: int, w: int, h: int) -> void {
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gsl_jitter_frame(render3d_st)
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cam_update(render3d_st)
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}
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function cam_set(render3d_st: mut Render3dState, x: float, y: float, z: float, yaw_deg: float, pitch_deg: float) -> void {
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v3_set(render3d_st.cam_pos, x, y, z)
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render3d_st.cam_yaw = Math.deg_to_rad(yaw_deg)
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render3d_st.cam_pitch = Math.deg_to_rad(pitch_deg)
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cam_update(render3d_st)
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}
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function cam_update(render3d_st: mut Render3dState) -> void {
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let cy = Math.cos(render3d_st.cam_yaw); let sy = Math.sin(render3d_st.cam_yaw)
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let cp = Math.cos(render3d_st.cam_pitch); let sp = Math.sin(render3d_st.cam_pitch)
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v3_set(render3d_st.cam_fwd, -(sy * cp), sp, -(cy * cp))
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v3_set(render3d_st.cam_right, cy, 0.0, -sy)
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let at = floats(3)
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v3_add(at, render3d_st.cam_pos, render3d_st.cam_fwd)
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let up = v3_new(0.0, 1.0, 0.0)
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m4_look_at(render3d_st.cam_view, render3d_st.cam_pos, at, up)
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m4_perspective(render3d_st.cam_proj, render3d_st.cam_fov, render3d_st.cam_aspect, render3d_st.cam_near, render3d_st.cam_far)
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m4_mul(render3d_st.cam_vp_clean, render3d_st.cam_proj, render3d_st.cam_view)
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m4_inverse(render3d_st.cam_inv_vp_clean, render3d_st.cam_vp_clean)
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# DLSS's sub-pixel jitter (streamline.ludic), in the projection the scene draws with only:
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# culling, depth reconstruction and last frame's matrix keep the clean one
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if render3d_st.gsl_jitter_x != 0.0 or render3d_st.gsl_jitter_y != 0.0 {
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render3d_st.cam_proj[8] = render3d_st.cam_proj[8] - render3d_st.gsl_jitter_x
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render3d_st.cam_proj[9] = render3d_st.cam_proj[9] - render3d_st.gsl_jitter_y
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}
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m4_mul(render3d_st.cam_vp, render3d_st.cam_proj, render3d_st.cam_view)
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m4_inverse(render3d_st.cam_inv_vp, render3d_st.cam_vp)
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m4_inverse(render3d_st.cam_inv_proj, render3d_st.cam_proj)
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free(at); free(up)
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cam_planes_update(render3d_st)
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}
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function cam_planes_update(render3d_st: mut Render3dState) -> void {
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if render3d_st.cam_planes == null { render3d_st.cam_planes = floats(16) }
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let m = render3d_st.cam_vp_clean
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for p in 0 .. 4 {
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var r = 0
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if p >= 2 { r = 1 }
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var sg = 1.0
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if p == 1 or p == 3 { sg = -1.0 }
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var a = m[3] + sg * m[r]
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var b = m[7] + sg * m[4 + r]
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var c = m[11] + sg * m[8 + r]
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var d = m[15] + sg * m[12 + r]
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let inv = 1.0 / Math.sqrt(a * a + b * b + c * c)
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render3d_st.cam_planes[p * 4] = a * inv; render3d_st.cam_planes[p * 4 + 1] = b * inv
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render3d_st.cam_planes[p * 4 + 2] = c * inv; render3d_st.cam_planes[p * 4 + 3] = d * inv
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}
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}
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# is a sphere (float bits) at least partly inside the side planes of the view?
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function cam_sphere_visible(render3d_st: Render3dState, x: float, y: float, z: float, r: float) -> bool {
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if render3d_st.cam_planes == null { return true }
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let nr = -r
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for p in 0 .. 4 {
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let o = p * 4
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let dist = render3d_st.cam_planes[o] * x + render3d_st.cam_planes[o + 1] * y + render3d_st.cam_planes[o + 2] * z + render3d_st.cam_planes[o + 3]
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if dist < nr { return false }
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}
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return true
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}
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# fly: forward/strafe in metres, turn in radians
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function cam_move(render3d_st: mut Render3dState, fwd: float, strafe: float, up: float, dyaw: float, dpitch: float) -> void {
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render3d_st.cam_yaw = render3d_st.cam_yaw + dyaw
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render3d_st.cam_pitch = Math.clamp(render3d_st.cam_pitch + dpitch, -1.5, 1.5)
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v3_madd(render3d_st.cam_pos, render3d_st.cam_pos, render3d_st.cam_fwd, fwd)
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v3_madd(render3d_st.cam_pos, render3d_st.cam_pos, render3d_st.cam_right, strafe)
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render3d_st.cam_pos[1] = render3d_st.cam_pos[1] + up
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cam_update(render3d_st)
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}
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