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>
31 lines
1.6 KiB
GLSL
31 lines
1.6 KiB
GLSL
// tersun.frag — the terrain's sun visibility, on its own, one screen-sized R8 buffer.
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//
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// The ground's shading shader is large: it blends four scanned materials, a photograph
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// and a dozen noise fields. Adding a read of the cascade shadow map to it costs about
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// six milliseconds a frame on this driver — and costs the same whether the map is tapped
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// once or eight times, filtered or texelFetched, compared in hardware or by hand. It is
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// a cliff the big shader falls off, not work it performs. The same read from a small
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// shader is nearly free, so the read happens here instead: this pass rasterises the same
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// CDLOD patches, evaluates the cascades once per pixel, and writes the answer for
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// terrain.frag to look up by fragment coordinate.
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in vec3 v_wpos;
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in vec2 v_huv;
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out float o_sh;
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uniform sampler2D u_height;
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uniform mat4 u_view;
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uniform float u_far_split;
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uniform float u_far_band;
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void main() {
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vec3 p = v_wpos;
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if (p.y < u_clip_y) discard;
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vec3 N = normalize(texture(u_height, v_huv).gba);
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float dist = length(p - u_cam_pos);
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float viewDepth = -(u_view * vec4(p, 1.0)).z;
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// The same tier choice the ground makes, cross-faded over the same band: the near tier
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// keeps its filtered penumbra, the far tier its single tap, and the boundary between
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// them is not a contour you can find on the hillside.
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if (dist > u_far_split + u_far_band) o_sh = sunShadowCheap(p, N, viewDepth);
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else if (dist < u_far_split - u_far_band) o_sh = sunShadow(p, N, viewDepth);
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else o_sh = mix(sunShadow(p, N, viewDepth), sunShadowCheap(p, N, viewDepth),
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smoothstep(u_far_split - u_far_band, u_far_split + u_far_band, dist));
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}
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