52 lines
1.3 KiB
GLSL
52 lines
1.3 KiB
GLSL
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#version 330 core
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layout (location = 0) in ivec3 in_position;
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layout (location = 1) in int voxel_id;
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layout (location = 2) in int face_id;
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layout (location = 3) in int ao_id;
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layout (location = 4) in int flip_id;
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uniform mat4 m_proj;
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uniform mat4 m_view;
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uniform mat4 m_model;
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out vec3 voxel_color;
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out vec2 uv;
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out float shading;
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const float ao_values[4] = float[4](0.1, 0.25, 0.1, 1.0);
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const float face_shading[6] = float[6](
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1.0, 0.5, // top bottom
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0.5, 0.8, // right left
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0.5, 0.8 // front back
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);
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const vec2 uv_coords[4] = vec2[4](
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vec2(0, 0), vec2(0, 1),
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vec2(1, 0), vec2(1, 1)
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);
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const int uv_indices[24] = int[24](
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1, 0, 2, 1, 2, 3, // tex coord indices for vertices of an even face
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3, 0, 2, 3, 1, 0, // odd face
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3, 1, 0, 3, 0, 2, // even flipped face
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1, 2, 3, 1, 0, 2 // odd flipped face
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);
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vec3 hash31(float p) {
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vec3 p3 = fract(vec3(p * 21.2) * vec3(0.1031, 0.1030, 0.0973));
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p3 += dot(p3, p3.yzx + 33.33);
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return fract((p3.xxy + p3.yzz) * p3.zyx) + 0.05;
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}
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void main() {
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int uv_index = gl_VertexID % 6 + ((face_id & 1) + flip_id * 2) * 6;
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uv = uv_coords[uv_indices[uv_index]];
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voxel_color = hash31(voxel_id);
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shading = face_shading[face_id] * ao_values[ao_id];
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gl_Position = m_proj * m_view * m_model * vec4(in_position, 1.0);
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}
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