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Add Parallax preview & fix Undo\Redo history

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ExPikaPaka
2026-08-12 10:14:38 +02:00
parent 2db770b672
commit d926f7c490
7 changed files with 819 additions and 367 deletions
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47
resources/shaders/110/texture_displacement_bump.fs
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@@ -5,6 +5,9 @@
#define INTENSITY_CORRECTION 0.6
#define PARALLAX_STEPS 24
#define H_AT(uv) texture2D(height_tex, uv).r
const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
#define LIGHT_TOP_DIFFUSE (0.8 * INTENSITY_CORRECTION)
#define LIGHT_TOP_SPECULAR (0.125 * INTENSITY_CORRECTION)
@@ -30,6 +33,8 @@ uniform float tiling_scale;
uniform float rotation_rad;
uniform vec2 uv_offset;
uniform bool invert;
uniform float midlevel; // the height that means "don't move"; needed by the parallax step
uniform vec3 eye_model_pos; // camera position in this volume's local space, for the view ray
uniform bool use_vertex_uv;
// 2x3 affine (lin = (m00, m01, m10, m11), tr = (m02, m12)) applied to the dragged island's uv; see the
// 140 variant. Identity when nothing is dragged.
@@ -96,10 +101,50 @@ void main()
if (abs(det) > 1e-12)
triangle_normal = normalize(triangle_normal - (dHdx * R1 + dHdy * R2) / det);
} else if (weight > 0.0) {
vec2 uv = project_uv(model_pos.xyz, triangle_normal);
vec3 t, b;
projection_axes(triangle_normal, t, b);
// Parallax occlusion mapping: march the view ray through the height shell and shade at the
// first point where it drops below the displaced surface (see header).
float amp = (invert ? -1.0 : 1.0) * depth_mm * clamp(weight, 0.0, 1.0);
vec3 view_dir = normalize(eye_model_pos - model_pos.xyz);
float v_dot_n = dot(view_dir, triangle_normal);
vec2 uv = project_uv(model_pos.xyz, triangle_normal);
// The shell the displaced surface lives inside, as signed heights along the normal. Taken from
// both ends of h in [0, 1] so it stays correct for an inverted layer or a raised midlevel,
// where the surface sits *below* the undisplaced one.
float h_end_a = amp * (0.0 - midlevel);
float h_end_b = amp * (1.0 - midlevel);
float h_hi = max(h_end_a, h_end_b);
float h_lo = min(h_end_a, h_end_b);
// How far, in mm, sweeping the ray across the shell slides the sample point sideways. Below half
// a texel there is no parallax to find and the march would be pure cost - which is the common
// case of looking straight down at a surface.
float sweep = length(view_dir - triangle_normal * v_dot_n) * (h_hi - h_lo) / max(v_dot_n, 1e-4);
if (v_dot_n > 0.05 && sweep > 0.5 * tiling_scale * height_tex_texel.x) {
// A point at ray parameter s (model_pos + view_dir * s) sits at height s * v_dot_n above the
// undisplaced surface. Start at the top of the shell, where the ray is outside the surface
// by construction, and step inward; the crossing is what this pixel actually sees.
float s = h_hi / v_dot_n;
float ds = (h_hi - h_lo) / (v_dot_n * float(PARALLAX_STEPS));
vec2 prev_uv = project_uv(model_pos.xyz + view_dir * s, triangle_normal);
float prev_gap = h_hi - amp * (H_AT(prev_uv) - midlevel); // >= 0 by construction
for (int i = 0; i < PARALLAX_STEPS; ++i) {
s -= ds;
vec2 cur_uv = project_uv(model_pos.xyz + view_dir * s, triangle_normal);
float gap = s * v_dot_n - amp * (H_AT(cur_uv) - midlevel);
if (gap <= 0.0) {
// Crossed between the last two samples - interpolating the hit is what stops it
// quantising to the step size, and so what keeps the step count affordable.
uv = mix(prev_uv, cur_uv, clamp(prev_gap / max(prev_gap - gap, 1e-6), 0.0, 1.0));
break;
}
prev_uv = cur_uv;
prev_gap = gap;
}
}
float hL = texture2D(height_tex, uv - vec2(height_tex_texel.x, 0.0)).r;
float hR = texture2D(height_tex, uv + vec2(height_tex_texel.x, 0.0)).r;
float hD = texture2D(height_tex, uv - vec2(0.0, height_tex_texel.y)).r;