Orkuncakilkaya
cc89fc37a4
A numbers float file adapts decimal literals to a fixed operand or slot, and refuses to promote a computed int to a float implicitly: there it is almost always float bits. Explicit float(x) is always allowed. render3d's numbers are float, converted by tools/migrate/floatbits.py - a whole-program inference of which ints carried IEEE bits (union-find over flows, calls, returns, buffers, nested buffers and lexical scopes) and a rewriter to operators, Math.* and float literals, with float_bits / float_from_bits left only where bits really cross (runtime scratch buffers, mixed buffers). Seed regenerated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
108 lines
4 KiB
Text
108 lines
4 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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var cam_pos: floats = null # x, y, z
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var cam_yaw: float = 0.0 # radians, 0 = looking down -z
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var cam_pitch: float = 0.0
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var cam_fov: float = 0.0 # vertical, radians
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var cam_near: float = 0.0
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var cam_far: float = 0.0
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var cam_aspect: float = 0.0
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var cam_view: floats = null
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var cam_proj: floats = null
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var cam_vp: floats = null
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var cam_inv_vp: floats = null
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var cam_inv_proj: floats = null
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var cam_vp_clean: floats = null # view-projection, kept for depth reconstruction
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var cam_inv_vp_clean: floats = null
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var cam_fwd: floats = null
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var cam_right: floats = null
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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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var cam_planes: floats = null
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function cam_init(aspect: float) -> void {
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cam_pos = v3_new(0.0, 2.0, 0.0)
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cam_view = m4_new(); cam_proj = m4_new(); cam_vp = m4_new(); cam_inv_vp = m4_new(); cam_inv_proj = m4_new()
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cam_vp_clean = m4_new(); cam_inv_vp_clean = m4_new()
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cam_fwd = v3_new(0.0, 0.0, -1.0)
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cam_right = v3_new(1.0, 0.0, 0.0)
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cam_fov = Math.deg_to_rad(42.0)
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cam_near = 0.3
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cam_far = 14000.0
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cam_aspect = aspect
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cam_update()
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}
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function cam_begin_frame(n: int, w: int, h: int) -> void {
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gsl_jitter_frame()
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cam_update()
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}
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function cam_set(x: float, y: float, z: float, yaw_deg: float, pitch_deg: float) -> void {
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v3_set(cam_pos, x, y, z)
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cam_yaw = Math.deg_to_rad(yaw_deg)
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cam_pitch = Math.deg_to_rad(pitch_deg)
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cam_update()
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}
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function cam_update() -> void {
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let cy = Math.cos(cam_yaw); let sy = Math.sin(cam_yaw)
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let cp = Math.cos(cam_pitch); let sp = Math.sin(cam_pitch)
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v3_set(cam_fwd, -(sy * cp), sp, -(cy * cp))
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v3_set(cam_right, cy, 0.0, -sy)
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let at = floats(3)
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v3_add(at, cam_pos, cam_fwd)
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let up = v3_new(0.0, 1.0, 0.0)
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m4_look_at(cam_view, cam_pos, at, up)
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m4_perspective(cam_proj, cam_fov, cam_aspect, cam_near, cam_far)
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m4_mul(cam_vp_clean, cam_proj, cam_view)
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m4_inverse(cam_inv_vp_clean, 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 gsl_jitter_x != 0.0 or gsl_jitter_y != 0.0 {
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cam_proj[8] = cam_proj[8] - gsl_jitter_x
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cam_proj[9] = cam_proj[9] - gsl_jitter_y
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}
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m4_mul(cam_vp, cam_proj, cam_view)
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m4_inverse(cam_inv_vp, cam_vp)
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m4_inverse(cam_inv_proj, cam_proj)
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free(at); free(up)
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cam_planes_update()
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}
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function cam_planes_update() -> void {
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if cam_planes == null { cam_planes = floats(16) }
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let m = 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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cam_planes[p * 4] = a * inv; cam_planes[p * 4 + 1] = b * inv
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cam_planes[p * 4 + 2] = c * inv; 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(x: float, y: float, z: float, r: float) -> bool {
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if 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 = cam_planes[o] * x + cam_planes[o + 1] * y + cam_planes[o + 2] * z + 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(fwd: float, strafe: float, up: float, dyaw: float, dpitch: float) -> void {
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cam_yaw = cam_yaw + dyaw
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cam_pitch = Math.clamp(cam_pitch + dpitch, -1.5, 1.5)
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v3_madd(cam_pos, cam_pos, cam_fwd, fwd)
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v3_madd(cam_pos, cam_pos, cam_right, strafe)
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cam_pos[1] = cam_pos[1] + up
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cam_update()
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}
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