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out vec4 fragColor;
uniform usampler2D objectId;
uniform sampler2D transparentAccum;
uniform sampler2D transparentRevealage;
uniform vec2 invertedViewportSize;
layout(std140) uniform world_block {
WorldData world_data;
};
void main()
{
ivec2 texel = ivec2(gl_FragCoord.xy);
vec2 uv_viewport = gl_FragCoord.xy * invertedViewportSize;
uint object_id = texelFetch(objectId, texel, 0).r;
/* Listing 4 */
vec4 trans_accum = texelFetch(transparentAccum, texel, 0);
float trans_revealage = trans_accum.a;
trans_accum.a = texelFetch(transparentRevealage, texel, 0).r;
#ifdef V3D_SHADING_OBJECT_OUTLINE
float outline = calculate_object_outline(objectId, texel, object_id);
#else /* V3D_SHADING_OBJECT_OUTLINE */
float outline = 1.0;
#endif /* V3D_SHADING_OBJECT_OUTLINE */
vec3 bg_color = background_color(world_data, uv_viewport.y);
/* TODO: Bypass the whole shader if there is no xray pass and no outline pass. */
vec3 trans_color = trans_accum.rgb / clamp(trans_accum.a, 1e-4, 5e4);
vec3 color = mix(trans_color, bg_color, trans_revealage);
color = mix(world_data.object_outline_color.rgb, color, outline);
fragColor = vec4(color, 1.0);
}
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