121 lines
3.5 KiB
GLSL
121 lines
3.5 KiB
GLSL
#version 150 core
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uniform sampler2D uColor;
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uniform sampler2D uNormal;
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uniform sampler2D uDepth;
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uniform sampler2D uAmbientOcclusion;
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#define USE_SAMPLER2D_SHADOW 1
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#ifdef USE_SAMPLER2D_SHADOW
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uniform sampler2DShadow uShadowMap;
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#else
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uniform sampler2D uShadowMap;
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#endif
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uniform sampler2D uPosition;
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uniform vec3 uLightDirection;
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uniform mat4 uLightSpaceMatrix;
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uniform mat4 uViewToLightSpaceMatrix;
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uniform float uShadowBias;
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in vec2 ioFragTexCoords;
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out vec3 outColor;
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float ShadowCalculationPCF(vec4 frag_pos_light_space, vec3 frag_normal_light_space) {
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vec3 projected_coordinates = frag_pos_light_space.xyz / frag_pos_light_space.w;
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projected_coordinates = projected_coordinates * 0.5 + 0.5;
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if (abs(projected_coordinates.z) > 1.0 ) {
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return 0.0;
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}
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float current_depth = projected_coordinates.z;
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float bias = 0.00;
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bias = max(0.001 * (1.0 - dot(frag_normal_light_space, uLightDirection)), uShadowBias);
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float shadow = 0.0;
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vec2 texel_size = 1.0 / textureSize(uShadowMap, 0);
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for (int x = -1; x <= 1; ++x) {
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for (int y = -1; y <= 1; ++y) {
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#ifdef USE_SAMPLER2D_SHADOW
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vec2 coordinate = projected_coordinates.xy + vec2(x, y) * texel_size;
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float pcf_depth = texture(uShadowMap, vec3(coordinate, current_depth - bias));
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#else
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float pcf_depth = texture(uShadowMap, projected_coordinates.xy).r;
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#endif
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shadow += current_depth - bias > pcf_depth ? 1.0 : 0.0;
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}
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}
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shadow /= 9.0;
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return shadow;
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}
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float ShadowCalculation(vec4 frag_pos_light_space, vec3 frag_normal_light_space) {
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vec3 projected_coordinates = frag_pos_light_space.xyz / frag_pos_light_space.w;
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projected_coordinates = projected_coordinates * 0.5 + 0.5;
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float current_depth = projected_coordinates.z;
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float bias = 0.01;
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#ifdef USE_SAMPLER2D_SHADOW
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float closest_depth = texture(uShadowMap, vec3(projected_coordinates.xy, current_depth - bias));
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#else
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float closest_depth = texture(uShadowMap, projected_coordinates.xy).r;
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bias = max(0.005 * (1.0 - dot(frag_normal_light_space, uLightDirection)), 0.003);
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#endif
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return current_depth - bias > closest_depth ? 1.0 : 0.0;
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}
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vec3 get_cascade_color (float depth) {
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if (depth < 0.97) {
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return vec3 (1.0, 0.0, 0.0);
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} else if (depth < 0.99) {
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return vec3 (0.0, 1.0, 0.0);
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}
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return vec3 (0.0, 0.0, 1.0);
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}
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void main() {
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vec3 color = texture(uColor, ioFragTexCoords).rgb;
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vec3 normal = texture (uNormal, ioFragTexCoords).xyz;
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float depth = texture (uDepth, ioFragTexCoords).r;
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vec3 position = texture (uPosition, ioFragTexCoords).xyz;
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float ambient_occlusion = texture(uAmbientOcclusion, ioFragTexCoords).r;
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// ambient lighting
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float ambient_strength = 0.2;
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vec3 ambient = ambient_strength * color;
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vec3 light_dir = -uLightDirection;
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// diffuse lighting
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float diff = max(dot(normal, light_dir), 0.0);
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vec3 diffuse = diff * color;
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// specular lighting
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vec3 view_dir = normalize(-position);
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vec3 halfway_dir = normalize(light_dir + view_dir);
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float spec = pow(max(dot(normal, halfway_dir), 0.0), 32);
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vec3 specular = spec * vec3(0.5);
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// shadow (need to transform position and normal to light space)
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vec4 position_light_space = uViewToLightSpaceMatrix * vec4(position, 1.0);
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vec3 normal_light_space = (transpose(inverse(uViewToLightSpaceMatrix)) * vec4(normal, 1.0)).xyz;
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float shadow = ShadowCalculationPCF(position_light_space, normal);
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// vec3 cascade = get_cascade_color(depth);
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// ambient = cascade;
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outColor = (ambient + (1.0 - shadow) * (diffuse + specular)) * ambient_occlusion;
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// outColor = (ambient + (diffuse + specular)) * ambient_occlusion;
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}
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