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#ifdef V3D_SHADING_TEXTURE_COLOR
uniform sampler2D image;
uniform float ImageTransparencyCutoff = 0.1;
#endif
uniform mat4 ProjectionMatrix;
uniform mat3 normalWorldMatrix;
uniform float alpha = 0.5;
uniform vec2 invertedViewportSize;
uniform vec4 viewvecs[3];
uniform vec4 materialDiffuseColor;
uniform vec4 materialSpecularColor;
uniform float materialRoughness;
#ifdef NORMAL_VIEWPORT_PASS_ENABLED
in vec3 normal_viewport;
#endif /* NORMAL_VIEWPORT_PASS_ENABLED */
#ifdef V3D_SHADING_TEXTURE_COLOR
in vec2 uv_interp;
#endif
#ifdef V3D_LIGHTING_MATCAP
uniform sampler2D matcapImage;
#endif
layout(std140) uniform world_block {
WorldData world_data;
};
layout(location=0) out vec4 transparentAccum;
layout(location=1) out float revealageAccum; /* revealage actually stored in transparentAccum.a */
void main()
{
vec4 diffuse_color;
vec3 diffuse_light = vec3(1.0);
#ifdef V3D_SHADING_TEXTURE_COLOR
diffuse_color = texture(image, uv_interp);
if (diffuse_color.a < ImageTransparencyCutoff) {
discard;
}
#else
diffuse_color = materialDiffuseColor;
#endif /* V3D_SHADING_TEXTURE_COLOR */
vec2 uv_viewport = gl_FragCoord.xy * invertedViewportSize;
vec3 I_vs = view_vector_from_screen_uv(uv_viewport, viewvecs, ProjectionMatrix);
#ifdef NORMAL_VIEWPORT_PASS_ENABLED
vec3 nor = normalize(normal_viewport);
#endif
#ifdef V3D_LIGHTING_MATCAP
bool flipped = world_data.matcap_orientation != 0;
vec2 matcap_uv = matcap_uv_compute(I_vs, nor, flipped);
diffuse_light = texture(matcapImage, matcap_uv).rgb;
#endif
#ifdef V3D_SHADING_SPECULAR_HIGHLIGHT
vec3 specular_color = get_world_specular_lights(world_data, vec4(materialSpecularColor.rgb, materialRoughness), nor, I_vs);
#else
vec3 specular_color = vec3(0.0);
#endif
#ifdef V3D_LIGHTING_STUDIO
# ifdef STUDIOLIGHT_ORIENTATION_CAMERA
diffuse_light = get_camera_diffuse_light(world_data, nor);
# endif
# ifdef STUDIOLIGHT_ORIENTATION_WORLD
vec3 normal_world = normalWorldMatrix * nor;
diffuse_light = get_world_diffuse_light(world_data, normal_world);
# endif
#endif
vec3 shaded_color = diffuse_light * diffuse_color.rgb + specular_color;
/* Based on :
* McGuire and Bavoil, Weighted Blended Order-Independent Transparency, Journal of
* Computer Graphics Techniques (JCGT), vol. 2, no. 2, 122–141, 2013
*/
/* Listing 4 */
float z = linear_zdepth(gl_FragCoord.z, viewvecs, ProjectionMatrix);
float weight = calculate_transparent_weight(z, alpha);
transparentAccum = vec4(shaded_color * weight, alpha);
revealageAccum = weight;
}
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