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65 lines
1.9 KiB
65 lines
1.9 KiB
#version 450
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const int MAX_LIGHTS = 10;
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layout(location = 0) in vec3 v_Normal;
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layout(location = 1) in vec4 v_Position;
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layout(location = 0) out vec4 o_Target;
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struct Light {
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mat4 proj;
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vec4 pos;
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vec4 color;
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};
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layout(set = 0, binding = 0) uniform Globals {
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mat4 u_ViewProj;
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uvec4 u_NumLights;
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};
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layout(set = 0, binding = 1) uniform Lights {
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Light u_Lights[MAX_LIGHTS];
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};
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layout(set = 0, binding = 2) uniform texture2DArray t_Shadow;
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layout(set = 0, binding = 3) uniform samplerShadow s_Shadow;
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layout(set = 1, binding = 0) uniform Entity {
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mat4 u_World;
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vec4 u_Color;
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};
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float fetch_shadow(int light_id, vec4 homogeneous_coords) {
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if (homogeneous_coords.w <= 0.0) {
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return 1.0;
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}
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// compensate for the Y-flip difference between the NDC and texture coordinates
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const vec2 flip_correction = vec2(0.5, -0.5);
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// compute texture coordinates for shadow lookup
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vec4 light_local = vec4(
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homogeneous_coords.xy * flip_correction/homogeneous_coords.w + 0.5,
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light_id,
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homogeneous_coords.z / homogeneous_coords.w
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);
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// do the lookup, using HW PCF and comparison
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return texture(sampler2DArrayShadow(t_Shadow, s_Shadow), light_local);
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}
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void main() {
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vec3 normal = normalize(v_Normal);
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vec3 ambient = vec3(0.05, 0.05, 0.05);
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// accumulate color
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vec3 color = ambient;
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for (int i=0; i<int(u_NumLights.x) && i<MAX_LIGHTS; ++i) {
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Light light = u_Lights[i];
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// project into the light space
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float shadow = fetch_shadow(i, light.proj * v_Position);
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// compute Lambertian diffuse term
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vec3 light_dir = normalize(light.pos.xyz - v_Position.xyz);
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float diffuse = max(0.0, dot(normal, light_dir));
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// add light contribution
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color += shadow * diffuse * light.color.xyz;
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}
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// multiply the light by material color
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o_Target = vec4(color, 1.0) * u_Color;
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}
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