83 lines
2.9 KiB
GLSL
83 lines
2.9 KiB
GLSL
#version 450 core
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layout(binding = 0) uniform sampler2D heightTexture;
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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(std140, binding = 0) uniform SceneUniforms
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{
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mat4 PV; //camera projection * view matrix
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vec4 eye_w; //world-space eye position
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};
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layout(location = 0) out vec4 FragColor;
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layout(location = 1) out vec4 FragPosition;
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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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//FragColor = vec4(fragNormal, 1.0f);
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float shininess = 1.0f;
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vec3 lightColor = vec3(0.5f);
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vec3 objectColor = vec3(texture(heightTexture, fs_in.texCoord).r);
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// Ambient
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vec3 ambient = vec3(0.15f) * vec3(0.15f);
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// Diffuse
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//vec3 norm = normalize(normal);
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vec3 norm = calculateNormalsFromHeightTexture();
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vec3 lightDir = normalize(vec3(1.0f, 1.0f, -1.0f) - fs_in.position);
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float diff = max(dot(norm, lightDir), 0.0);
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vec3 diffuse = diff * vec3(texture(heightTexture, fs_in.texCoord).r);
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// Specular (Phong)
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vec3 viewDir = normalize(eye_w.xyz - fs_in.position);
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vec3 reflectDir = reflect(-lightDir, norm);
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float spec = pow(max(dot(viewDir, reflectDir), 0.0), shininess);
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vec3 specular = spec * lightColor;
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// Combine results
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vec3 result = ambient + diffuse;
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FragColor = vec4(fs_in.normal, 1.0);
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FragPosition = vec4(fs_in.position, 1.0);
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//FragColor = vec4(vec3(texture(heightTexture, fs_in.texCoord).r), 1.0);
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//FragColor = vec4((fs_in.position * 0.5 + 0.5), 1.0);
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} |