85 lines
2.2 KiB
GLSL
85 lines
2.2 KiB
GLSL
#[vertex]
|
|
|
|
#version 450
|
|
|
|
#VERSION_DEFINES
|
|
|
|
layout(push_constant, std430) uniform Params {
|
|
float z_far;
|
|
float z_near;
|
|
vec2 texel_size;
|
|
vec4 screen_rect;
|
|
}
|
|
params;
|
|
|
|
layout(location = 0) out vec2 uv_interp;
|
|
|
|
void main() {
|
|
vec2 base_arr[4] = vec2[](vec2(0.0, 0.0), vec2(0.0, 1.0), vec2(1.0, 1.0), vec2(1.0, 0.0));
|
|
uv_interp = base_arr[gl_VertexIndex];
|
|
vec2 screen_pos = uv_interp * params.screen_rect.zw + params.screen_rect.xy;
|
|
gl_Position = vec4(screen_pos * 2.0 - 1.0, 0.0, 1.0);
|
|
}
|
|
|
|
#[fragment]
|
|
|
|
#version 450
|
|
|
|
#VERSION_DEFINES
|
|
|
|
layout(location = 0) in vec2 uv_interp;
|
|
|
|
layout(set = 0, binding = 0) uniform samplerCube source_cube;
|
|
|
|
layout(push_constant, std430) uniform Params {
|
|
float z_far;
|
|
float z_near;
|
|
vec2 texel_size;
|
|
vec4 screen_rect;
|
|
}
|
|
params;
|
|
|
|
void main() {
|
|
vec2 uv = uv_interp;
|
|
vec2 texel_size = abs(params.texel_size);
|
|
|
|
uv = clamp(uv * (1.0 + 2.0 * texel_size) - texel_size, vec2(0.0), vec2(1.0));
|
|
|
|
vec3 normal = vec3(uv * 2.0 - 1.0, 0.0);
|
|
normal.z = 0.5 * (1.0 - dot(normal.xy, normal.xy)); // z = 1/2 - 1/2 * (x^2 + y^2)
|
|
normal = normalize(normal);
|
|
|
|
normal.y = -normal.y; //needs to be flipped to match projection matrix
|
|
if (params.texel_size.x >= 0.0) { // Sign is used to encode Z flip
|
|
normal.z = -normal.z;
|
|
}
|
|
|
|
float depth = texture(source_cube, normal).r;
|
|
|
|
// absolute values for direction cosines, bigger value equals closer to basis axis
|
|
vec3 unorm = abs(normal);
|
|
|
|
if ((unorm.x >= unorm.y) && (unorm.x >= unorm.z)) {
|
|
// x code
|
|
unorm = normal.x > 0.0 ? vec3(1.0, 0.0, 0.0) : vec3(-1.0, 0.0, 0.0);
|
|
} else if ((unorm.y > unorm.x) && (unorm.y >= unorm.z)) {
|
|
// y code
|
|
unorm = normal.y > 0.0 ? vec3(0.0, 1.0, 0.0) : vec3(0.0, -1.0, 0.0);
|
|
} else if ((unorm.z > unorm.x) && (unorm.z > unorm.y)) {
|
|
// z code
|
|
unorm = normal.z > 0.0 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 0.0, -1.0);
|
|
} else {
|
|
// oh-no we messed up code
|
|
// has to be
|
|
unorm = vec3(1.0, 0.0, 0.0);
|
|
}
|
|
|
|
float depth_fix = 1.0 / dot(normal, unorm);
|
|
|
|
depth = 2.0 * depth - 1.0;
|
|
float linear_depth = 2.0 * params.z_near * params.z_far / (params.z_far + params.z_near + depth * (params.z_far - params.z_near));
|
|
// linear_depth equal to view space depth
|
|
depth = (params.z_far - linear_depth * depth_fix) / params.z_far;
|
|
gl_FragDepth = depth;
|
|
}
|