68 lines
2.1 KiB
GLSL
68 lines
2.1 KiB
GLSL
shader_type spatial;
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render_mode unshaded, cull_front;
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uniform sampler2D view2texture;
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uniform mat4 model_transform;
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uniform float fovy_degrees = 45;
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uniform float z_near = 0.01;
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uniform float z_far = 60.0;
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uniform float aspect = 1.0;
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varying vec4 global_position;
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varying vec3 normal;
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mat4 get_projection_matrix() {
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float PI = 3.14159265359;
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float rads = fovy_degrees / 2.0 * PI / 180.0;
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float deltaZ = z_far - z_near;
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float sine = sin(rads);
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if (deltaZ == 0.0 || sine == 0.0 || aspect == 0.0)
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return mat4(0.0);
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float cotangent = cos(rads) / sine;
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mat4 matrix = mat4(1.0);
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matrix[0][0] = cotangent / aspect;
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matrix[1][1] = cotangent;
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matrix[2][2] = (z_far + z_near) / deltaZ;
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matrix[2][3] = 1.0; //try +1
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matrix[3][2] = 2.0 * z_near * z_far / deltaZ;
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matrix[3][3] = 0.0;
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return matrix;
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}
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void vertex() {
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global_position = model_transform*vec4(VERTEX, 1.0);
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normal = (model_transform*vec4(NORMAL, 0.0)).xyz;
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VERTEX=vec3(UV.x, UV.y, 0.0);
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COLOR=vec4(1.0);
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}
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float visibility(vec2 uv, vec3 view_pos) {
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vec2 uv_delta = textureLod(view2texture, view_pos.xy, 0.0).xy-uv;
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return step(dot(uv_delta, uv_delta), 0.0025);
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/*
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vec3 depth_delta = textureLod(view2texture, view_pos.xy, 0.0).xyz-vec3(cos(view_pos.z), sin(view_pos.z*7.0), sin(view_pos.z/7.0));
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return step(dot(depth_delta, depth_delta), 0.1);
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*/
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}
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void fragment() {
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vec4 position = get_projection_matrix()*vec4(global_position.xyz, 1.0);
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position.xyz /= position.w;
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vec3 xyz = vec3(0.5-0.5*position.x, 0.5+0.5*position.y, z_near + (z_far - z_near)*position.z);
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float visible = 0.0;
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if (position.x > -1.0 && position.x < 1.0 && position.y > -1.0 && position.y < 1.0) {
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float visibility_multiplier = max(visibility(UV.xy, xyz), max(max(visibility(UV.xy, xyz+vec3(0.001, 0.0, 0.0)), visibility(UV.xy, xyz+vec3(-0.0001, 0.0, 0.0))), max(visibility(UV.xy, xyz+vec3(0.0, 0.001, 0.0)), visibility(UV.xy, xyz+vec3(0.0, -0.0001, 0.0)))));
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//float visibility_multiplier = visibility(UV.xy, xyz);
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float normal_multiplier = clamp(dot(normalize(normal), vec3(0.0, 0.0, 1.0)), 0.0, 1.0);
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visible = normal_multiplier*visibility_multiplier;
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}
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ALBEDO = vec3(xyz.xy, visible);
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}
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