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out vec4 fragColor;
uniform sampler2D depthBuffer;
uniform sampler2D colorBuffer;
uniform sampler2D normalBuffer;
uniform usampler2D objectId;
uniform vec2 invertedViewportSize;
uniform mat4 WinMatrix; /* inverse WinMatrix */
uniform vec4 viewvecs[3];
uniform vec4 ssao_params;
uniform vec4 ssao_settings;
uniform vec2 curvature_settings;
uniform sampler2D ssao_jitter;
layout(std140) uniform samples_block
{
vec4 ssao_samples[500];
};
#define ssao_samples_num ssao_params.x
#define jitter_tilling ssao_params.yz
#define ssao_iteration ssao_params.w
#define ssao_distance ssao_settings.x
#define ssao_factor_cavity ssao_settings.y
#define ssao_factor_edge ssao_settings.z
#define ssao_attenuation ssao_settings.w
vec3 get_view_space_from_depth(in vec2 uvcoords, in float depth)
{
if (WinMatrix[3][3] == 0.0) {
/* Perspective */
float d = 2.0 * depth - 1.0;
float zview = -WinMatrix[3][2] / (d + WinMatrix[2][2]);
return zview * (viewvecs[0].xyz + vec3(uvcoords, 0.0) * viewvecs[1].xyz);
}
else {
/* Orthographic */
vec3 offset = vec3(uvcoords, depth);
return viewvecs[0].xyz + offset * viewvecs[1].xyz;
}
}
/* forward declaration */
void ssao_factors(in float depth,
in vec3 normal,
in vec3 position,
in vec2 screenco,
out float cavities,
out float edges);
void main()
{
vec2 screenco = vec2(gl_FragCoord.xy) * invertedViewportSize;
ivec2 texel = ivec2(gl_FragCoord.xy);
float cavity = 0.0, edges = 0.0, curvature = 0.0;
#ifdef USE_CAVITY
float depth = texelFetch(depthBuffer, texel, 0).x;
vec3 position = get_view_space_from_depth(screenco, depth);
vec3 normal_viewport = workbench_normal_decode(texelFetch(normalBuffer, texel, 0).rg);
ssao_factors(depth, normal_viewport, position, screenco, cavity, edges);
#endif
#ifdef USE_CURVATURE
curvature = calculate_curvature(
objectId, normalBuffer, texel, curvature_settings.x, curvature_settings.y);
#endif
float final_cavity_factor = clamp((1.0 - cavity) * (1.0 + edges) * (1.0 + curvature), 0.0, 4.0);
/* Using UNORM render target so compress the range. */
fragColor = vec4(final_cavity_factor / CAVITY_BUFFER_RANGE);
}
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