65 lines
2.0 KiB
GLSL
65 lines
2.0 KiB
GLSL
#pragma language glsl4
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uniform sampler2D g_color_sampler;
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uniform sampler2D g_position_sampler;
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uniform sampler2D g_normal_sampler;
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uniform sampler2D noise_sampler;
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uniform mat4 projection2;
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uniform vec3 sample_kernel[64];
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const vec2 noise_scale = vec2(1024.0 / 4.0, 1024 / 4.0);
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const float bias = 0.05;
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const float radius = 0.5;
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const int samples = 64;
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varying vec4 PixelTexture;
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out vec4 out_color;
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layout (std430) readonly buffer SSAOKernelLayout
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{
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vec4 SSAOKernel[];
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};
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void pixelmain()
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{
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vec3 color = texture(g_color_sampler, PixelTexture.xy).xyz;
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vec3 position = texture(g_position_sampler, PixelTexture.xy).xyz;
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vec3 normal = normalize(texture(g_normal_sampler, PixelTexture.xy).xyz);
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vec3 noise = normalize(vec3(texture(noise_sampler, PixelTexture.xy * noise_scale).xy, 0));
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vec3 tangent = normalize(noise - normal * dot(noise, normal));
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vec3 bitangent = cross(normal, tangent);
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mat3 TBN = mat3(tangent, bitangent, normal);
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float occlusion = 0.0;
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for (int i = 0; i < samples; i++) {
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vec3 sample_position = TBN * SSAOKernel[i].xyz;
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sample_position = sample_position * radius + position;
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vec4 offset = vec4(sample_position, 1.0);
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offset = projection2 * offset;
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offset.xyz = offset.xyz / offset.w;
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offset.xyz = offset.xyz * vec3(0.5, -0.5, 0.5) + 0.5;
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float sample_depth = texture(g_position_sampler, offset.xy).z;
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float range_check = smoothstep(0.0, 1.0, radius / abs(position.z - sample_depth));
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occlusion += (sample_depth >= sample_position.z + bias ? 1.0 : 0.0) * range_check;
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}
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occlusion = 1.0 - (occlusion / samples);
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out_color = vec4(color * vec3(pow(occlusion, 20) + 0.75), 1.0);
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//out_color = vec4(vec3(-position.z * 0.0001), 1.0);
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//out_color = vec4(vec3(-position.z * 0.0001), 1.0);
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//vec4 foo = projection2 * vec4(position, 1.0);
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//foo.xyz = foo.xyz / foo.w;
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//out_color = vec4(foo.xy * 0.5 + 0.5, 0.0, 1.0);
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//out_color = vec4(normal, 1);
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//out_color = vec4(SSAOKernel[].xyz * 8, 1.0);
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}
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