Basic flashlight

shaders/fog.fs

@@ -0,0 +1,73 @@
+#version 330 core
+
+in vec2 vTexCoord;
+in vec3 vWorldPos;
+
+uniform sampler2D texture0;
+
+// --- Soft bubble (kept) ---
+uniform vec3  u_playerPos;
+uniform float u_inner;
+uniform float u_outer;
+uniform float u_minShadow;
+
+// --- Flashlight cone + distance ---
+uniform vec3  u_spotDir;     // normalized camera forward
+uniform float u_spotCos;     // cos(half-angle)
+uniform float u_spotSoft;    // base penumbra width in cos-space
+uniform float u_lightRange;  // bright zone distance (>0)
+uniform float u_lightFade;   // fade width beyond range
+
+// --- NEW: decouple brightness + widen with distance ---
+uniform float u_intensity;   // flashlight peak brightness (independent of range)
+uniform float u_beamSpread;  // additional penumbra growth per unit distance (0..~0.5)
+
+// Alpha cut (trees, grass)
+uniform float u_alphaCutoff;
+
+out vec4 finalColor;
+
+// Helpers
+float remap01(float x, float a, float b) {
+    return clamp((x - a) / max(b - a, 1e-5), 0.0, 1.0);
+}
+float invsq(float d, float r) {
+    float s = d / max(r, 1e-4);
+    return 1.0 / (1.0 + s*s);
+}
+
+void main() {
+    vec4 texel = texture(texture0, vTexCoord);
+    if (texel.a < u_alphaCutoff) discard;
+
+    float dist = length(vWorldPos - u_playerPos);
+
+    // (A) Soft ambient bubble around the player (unchanged)
+    float bubble  = 1.0 - remap01(dist, u_inner, u_outer);          // 1 near, 0 far
+    float ambient = mix(1.0 - clamp(u_minShadow,0.0,1.0), 0.0, 1.0 - bubble);
+
+    // (B) Flashlight cone with penumbra + distance drop + widening
+    vec3  L        = normalize(vWorldPos - u_playerPos);
+    float cosTheta = dot(normalize(u_spotDir), L);
+
+    // Widen penumbra with distance so long ranges don't look like a laser
+    float distNorm = dist / max(u_lightRange, 1e-4);
+    float softWide = clamp(u_spotSoft + u_beamSpread * distNorm, 0.0, 0.8);
+
+    float innerEdge = u_spotCos;
+    float outerEdge = clamp(u_spotCos - softWide, -1.0, 1.0);
+
+    float spotA = smoothstep(outerEdge, innerEdge, cosTheta);
+    spotA *= spotA;  // mild hotspot
+
+    // Distance attenuation: inverse-square * soft fade band
+    float band   = 1.0 - remap01(dist, u_lightRange, u_lightRange + u_lightFade);
+    float lightD = invsq(dist, u_lightRange) * band;
+
+    // Decoupled brightness
+    float flashlight = u_intensity * spotA * lightD;
+
+    // Compose
+    float light = clamp(ambient + flashlight, 0.0, 1.0);
+    finalColor  = vec4(texel.rgb * light, texel.a);
+}