54 lines
2.0 KiB
GLSL
54 lines
2.0 KiB
GLSL
#version 450 core
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layout(binding = 0) uniform sampler2D heightTexture;
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layout(binding = 1) uniform sampler2D colorTexture;
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in TE_OUT {
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vec3 position;
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vec2 texCoord;
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vec3 normal;
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} fs_in;
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layout(location = 0) out vec4 albedoGbuffer;
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layout(location = 1) out vec4 positionGbuffer;
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layout(location = 2) out vec4 normalGbuffer;
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float getHeight(vec2 uv) {
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return texture(heightTexture, uv).r * 0.025f;
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}
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vec3 calculateNormalsFromHeightTexture() {
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// Calculate height at base_uv
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float height = getHeight(fs_in.texCoord);
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// Calculate normals using height differences around the fragment
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float eps = 1.0f / textureSize(heightTexture, 0).x;
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float hRight = getHeight(fs_in.texCoord + vec2(eps, 0.0));
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float hLeft = getHeight(fs_in.texCoord - vec2(eps, 0.0));
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float hUp = getHeight(fs_in.texCoord + vec2(0.0, eps));
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float hDown = getHeight(fs_in.texCoord - vec2(0.0, eps));
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float heightTL = getHeight(fs_in.texCoord + vec2(-eps, eps));
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float heightT = getHeight(fs_in.texCoord + vec2( 0.0, eps));
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float heightTR = getHeight(fs_in.texCoord + vec2( eps, eps));
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float heightL = getHeight(fs_in.texCoord + vec2(-eps, 0.0));
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float heightR = getHeight(fs_in.texCoord + vec2( eps, 0.0));
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float heightBL = getHeight(fs_in.texCoord + vec2(-eps, -eps));
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float heightB = getHeight(fs_in.texCoord + vec2( 0.0, -eps));
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float heightBR = getHeight(fs_in.texCoord + vec2( eps, -eps));
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float sobelX = (heightTL + 2.0 * heightL + heightBL) - (heightTR + 2.0 * heightR + heightBR);
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float sobelZ = (heightTL + 2.0 * heightT + heightTR) - (heightBL + 2.0 * heightB + heightBR);
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vec3 tangentX = normalize(vec3(eps, 0.0, sobelX));
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vec3 tangentZ = normalize(vec3(0.0, sobelZ, eps));
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// Final normal for the fragment
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return normalize(cross(tangentZ, tangentX));
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}
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void main() {
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albedoGbuffer = texture(colorTexture, vec2(fs_in.texCoord.x, -fs_in.texCoord.y));
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positionGbuffer = vec4(fs_in.position, 1.0f);
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normalGbuffer = vec4(fs_in.normal, 1.0f);
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} |