atdunbg
2c4efc5165
- LightComponent 加 Type（Directional/Point）+ radius；点光位置取 实体 Transform（固有组件首次实际受益） - LightData shader 契约扩为 4×vec4（color/direction/position/params， 每灯 64B，未用字段置零）；UBO 688→816B - 光照循环按类型分支：方向光无衰减；点光 L 指向光源 + 平方距离衰减， 衰减半径外跳过；CSM 阴影只来自第 0 盏方向光 - main.cpp：SunTemple 场景加暖橙火坑光 + 冷蓝填充光（点光）； KeyLight/FillLight 改 designated initializer
132 lines
4.8 KiB
GLSL
132 lines
4.8 KiB
GLSL
#version 450
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const int MAX_LIGHTS = 4;
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struct Light {
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vec4 color; // rgb = 颜色，a = 强度
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vec4 direction; // 方向光：xyz = 方向（已归一）
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vec4 position; // 点光：xyz = 世界位置
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vec4 params; // x = 类型(0=方向,1=点)，y = 衰减半径
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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 = 5) in vec3 fragTangent;
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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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vec4 cameraPos;
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} ubo;
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// 材质纹理槽（binding = Material::Slot）
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layout(set = 1, binding = 0) uniform sampler2D albedoMap;
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layout(set = 1, binding = 1) uniform sampler2D normalMap;
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layout(set = 1, binding = 2) uniform sampler2D specularMap;
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layout(set = 1, binding = 3) uniform sampler2D emissiveMap;
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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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// 法线贴图 → 世界空间法线（TBN 构建）。
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// 无切线数据（零向量）或平法线贴图时退回几何法线。
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vec3 MappedNormal(vec3 geomN, vec3 T, vec2 uv) {
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if (dot(T, T) < 1e-4) return geomN;
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vec3 N = geomN;
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vec3 nT = normalize(T - N * dot(N, T)); // 正交化
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vec3 B = cross(N, nT);
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vec3 sampled = texture(normalMap, uv).xyz * 2.0 - 1.0;
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if (dot(sampled, sampled) < 1e-4) return geomN;
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return normalize(nT * sampled.x + B * sampled.y + N * sampled.z);
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}
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void main() {
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vec3 albedo = texture(albedoMap, fragUV).rgb;
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float specIntensity = texture(specularMap, fragUV).r;
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vec3 emissive = texture(emissiveMap, fragUV).rgb;
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vec3 N = MappedNormal(normalize(fragNormal), fragTangent, fragUV);
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vec3 V = normalize(ubo.cameraPos.xyz - fragWorldPos);
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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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// 按类型分支：方向光无衰减；点光方向指向光源 + 平方距离衰减
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vec3 L;
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float atten = 1.0;
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if (ubo.lights[i].params.x > 0.5) {
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vec3 toLight = ubo.lights[i].position.xyz - fragWorldPos;
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float d = length(toLight);
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if (d >= ubo.lights[i].params.y) continue; // 衰减半径外，跳过
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L = toLight / d;
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float a = clamp(1.0 - (d * d) /
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(ubo.lights[i].params.y * ubo.lights[i].params.y),
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0.0, 1.0);
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atten = a * a; // 平方衰减，边缘更柔和
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} else {
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L = normalize(-ubo.lights[i].direction.xyz);
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}
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float diff = max(dot(N, L), 0.0);
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// Blinn-Phong 高光（半程向量；specular 图做强度系数）
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vec3 H = normalize(L + V);
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float spec = pow(max(dot(N, H), 0.0), 32.0) * specIntensity;
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// 阴影只来自第 0 盏方向光（CSM）
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float shade = (i == 0 && ubo.lights[0].params.x < 0.5)
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? ShadowFactor(N, fragViewDepth) : 1.0;
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result += ubo.lights[i].color.rgb * ubo.lights[i].color.a *
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(albedo * diff + vec3(spec)) * atten * shade;
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}
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// 自发光不经光照/阴影直接叠加
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result += emissive;
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outColor = vec4(result, 1.0);
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outVelocity = fragVelocity;
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}
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