Orkuncakilkaya
f25289db20
`Gl.*` binds the whole OpenGL 4.1 core API — every entry point of the platform gl3.h with every GL_* constant, generated by `ludic-dev glgen` with per-call ABI thunks. Windowed builds get an NSOpenGLContext on the existing window at Retina resolution; headless builds render into an offscreen CGL context, so a program that uses Gl.* renders and screenshots identically under the test harness. It links gl.ll, the thunks and OpenGL.framework only when used; every other build stays byte-identical. packages/ludic.render3d is a physically based renderer written on that surface: HDRI image-based lighting, GPU-generated terrain with scanned PBR materials, CDLOD, cascaded shadows, glTF with skinning, instanced vegetation with impostors, procedural grass, water, SSAO, and an HDR pipeline with bloom, auto-exposure and ACES. It also carries this session's work on it: the terrain at half its cost (10.3 -> 5.4 ms of frame), the streaming hitch that got worse the longer you played, a resize that emptied the world, and the packaging that lets a game use the renderer from its own repository — `ludic assets`, the material manifest shipping with the package, and shader lookup falling back to the install root. See changes/ for each, with its numbers. The camping game that drove all of it has moved out to its own repository, Maroon Lake; examples/rendering/smooth.ludic stays as the renderer's example here. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
40 lines
1.7 KiB
GLSL
40 lines
1.7 KiB
GLSL
in vec2 v_uv;
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out vec4 o_color;
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uniform sampler2D u_sky;
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uniform mat4 u_inv_vp;
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uniform float u_sky_gain;
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uniform float u_sky_sat;
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// a star: one hash per cell of the direction, a few of them bright, a slow twinkle
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float starField(vec3 dir, float t) {
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vec3 p = dir * 230.0;
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vec3 c = floor(p);
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vec3 f = p - c - 0.5;
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float h = fract(sin(dot(c, vec3(12.9898, 78.233, 37.719))) * 43758.5453);
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float h2 = fract(h * 91.7);
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float bright = smoothstep(0.972, 1.0, h);
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float disc = smoothstep(0.42, 0.0, length(f));
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float twinkle = 0.7 + 0.3 * sin(t * (1.5 + 3.0 * h2) + h2 * 40.0);
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return bright * disc * twinkle * (0.5 + h2);
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}
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void main() {
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vec4 a = u_inv_vp * vec4(v_uv * 2.0 - 1.0, 1.0, 1.0);
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vec3 dir = normalize(a.xyz / a.w - u_cam_pos);
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// level 0: the equirect seam (atan wraps) would otherwise pick the smallest mip along one column
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vec3 col = min(textureLod(u_sky, skyUV(dir), 0.0).rgb, vec3(4096.0)) * u_sky_gain;
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float l = dot(col, vec3(0.2126, 0.7152, 0.0722));
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col = max(mix(vec3(l), col, u_sky_sat), vec3(0.0));
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// the photograph's sky dims with the day (daylight.ludic); the night adds its own
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col *= u_ibl_scale;
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float night = 1.0 - smoothstep(0.0, 0.45, u_daylight);
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if (night > 0.0) {
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vec3 nightCol = mix(vec3(0.012, 0.016, 0.034), vec3(0.003, 0.004, 0.010), clamp(dir.y, 0.0, 1.0));
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float stars = starField(dir, u_time) * smoothstep(-0.02, 0.15, dir.y);
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nightCol += stars * vec3(0.55, 0.6, 0.7) * night;
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col += nightCol * night;
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}
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// below the horizon the HDRI ground is replaced by the fog colour
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float below = smoothstep(0.0, -0.08, dir.y);
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vec3 fogCol = skyPrefiltered(vec3(dir.x, 0.02, dir.z), 0.6);
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col = mix(col, fogCol, below);
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o_color = vec4(sane(col), 1.0);
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}
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