atdunbg
0328d4aaeb
- SceneRenderer::ComputeCascades：相机视锥实用分割（λ=0.6）→ 反投影 取切片角点 → 光空间 AABB 拟合 → 纹素对齐（消除相机移动时阴影边缘 闪烁）→ [0,1] 深度重映射 - Shadow pass 单 pass 渲 3 个 region，每级联 push 各自光空间 VP - Forward：UBO lightSpace[3]+cascadeSplits（视图深度选级联），Set2 三张级联图按 binding 0/1/2 采样；vertex 输出 fragViewDepth - 光源视锥剔除用最远级联（覆盖全阴影范围）；双视锥独立剔除铁律保留 - 旧单张 2048 全场景图退役；近处级联分辨率 ~128px/unit（约 2× 提升） - 编译零错误、validation 零警告、8 秒冒烟通过（10 pass 全活跃）
79 lines
2.6 KiB
GLSL
79 lines
2.6 KiB
GLSL
#version 450
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const int MAX_LIGHTS = 4;
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struct Light {
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vec4 direction;
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vec4 color;
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};
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layout(location = 0) in vec2 fragUV;
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layout(location = 1) in vec3 fragNormal;
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layout(location = 2) in vec3 fragWorldPos;
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layout(location = 3) in float fragViewDepth;
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layout(location = 4) in vec2 fragVelocity;
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layout(location = 0) out vec4 outColor;
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layout(location = 1) out vec2 outVelocity; // TAA velocity 附件
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layout(set = 0, binding = 0) uniform UniformBufferObject {
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mat4 view;
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mat4 proj;
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mat4 lightSpace[3]; // CSM 各级联光空间 VP
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vec4 cascadeSplits; // xyz = 级联 0..2 远边界（视图深度）
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vec4 ambientColor;
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Light lights[MAX_LIGHTS];
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mat4 projNoJitter;
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mat4 prevView;
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mat4 prevProj;
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} ubo;
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layout(set = 1, binding = 0) uniform sampler2D texSampler;
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layout(set = 2, binding = 0) uniform sampler2D shadowMap0; // CSM 级联 0（最近）
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layout(set = 2, binding = 1) uniform sampler2D shadowMap1; // 级联 1
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layout(set = 2, binding = 2) uniform sampler2D shadowMap2; // 级联 2（最远）
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// 第 0 盏灯（KeyLight）的 CSM 阴影因子：0.3 影中 / 1.0 受光。
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// 级联按视图深度选择；采样器均 clamp-to-border 白色：
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// 光视锥外自动 1.0（无阴影），省出界分支。
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float ShadowFactor(vec3 N, float viewDepth) {
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// 级联选择：第一个 viewDepth < split 的级联
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int cascade = 2;
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for (int i = 0; i < 3; ++i) {
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if (viewDepth < ubo.cascadeSplits[i]) { cascade = i; break; }
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}
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vec4 ls = ubo.lightSpace[cascade] * vec4(fragWorldPos, 1.0);
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vec3 proj = ls.xyz / ls.w;
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// NDC [-1,1] → UV [0,1]（ortho 的 w=1）
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vec2 uv = proj.xy * 0.5 + 0.5;
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float closest;
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if (cascade == 0) closest = texture(shadowMap0, uv).r;
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else if (cascade == 1) closest = texture(shadowMap1, uv).r;
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else closest = texture(shadowMap2, uv).r;
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// 斜率缩放 bias：掠射面用更大的 bias 压 acne
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vec3 L = normalize(-ubo.lights[0].direction.xyz);
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float bias = max(0.004 * (1.0 - dot(N, L)), 0.0012);
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return (proj.z - bias > closest) ? 0.3 : 1.0;
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}
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void main() {
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vec3 albedo = texture(texSampler, fragUV).rgb;
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vec3 N = normalize(fragNormal);
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vec3 result = ubo.ambientColor.rgb * albedo;
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for (int i = 0; i < MAX_LIGHTS; ++i) {
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vec3 L = normalize(-ubo.lights[i].direction.xyz);
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float diff = max(dot(N, L), 0.0);
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float shade = (i == 0) ? ShadowFactor(N, fragViewDepth) : 1.0;
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result += ubo.lights[i].color.rgb * ubo.lights[i].color.a * diff * albedo * shade;
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}
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outColor = vec4(result, 1.0);
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outVelocity = fragVelocity;
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}
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