0029337: Visualization, TKOpenGl - visual artifacts on Intel Broadwell GPU

[occt.git] / src / Shaders / DeclarationsImpl.glsl

diff --git a/src/Shaders/DeclarationsImpl.glsl b/src/Shaders/DeclarationsImpl.glsl
index eee338b..d3b1642 100644 (file)
--- a/src/Shaders/DeclarationsImpl.glsl
+++ b/src/Shaders/DeclarationsImpl.glsl
@@ -15,6 +15,22 @@
 
 // This file includes implementation of common functions and properties accessors
 
+#if defined(FRAGMENT_SHADER)
+#if defined(OCC_WRITE_WEIGHT_OIT_COVERAGE)
+//! Output color and coverage for accumulation by OIT algorithm.
+void occSetFragColor (in vec4 theColor)
+{
+  float aWeight     = theColor.a * clamp (1e+2 * pow (1.0 - gl_FragCoord.z * occOitDepthFactor, 3.0), 1e-2, 1e+2);
+  occFragCoverage.r = theColor.a * aWeight;
+  occFragColor      = vec4 (theColor.rgb * theColor.a * aWeight, theColor.a);
+}
+#else
+//! Output color.
+void occSetFragColor (in vec4 theColor) { occFragColor = theColor; }
+#endif
+#endif
+
+#if defined(THE_MAX_LIGHTS) && (THE_MAX_LIGHTS > 0)
 // arrays of light sources
 uniform THE_PREC_ENUM ivec2 occLightSourcesTypes[THE_MAX_LIGHTS]; //!< packed light sources types
 uniform               vec4  occLightSources[THE_MAX_LIGHTS * 4];  //!< packed light sources parameters
@@ -30,6 +46,7 @@ float occLight_ConstAttenuation  (in int theId) { return occLightSources[theId *
 float occLight_LinearAttenuation (in int theId) { return occLightSources[theId * 4 + 3].y; }
 float occLight_SpotCutOff        (in int theId) { return occLightSources[theId * 4 + 3].z; }
 float occLight_SpotExponent      (in int theId) { return occLightSources[theId * 4 + 3].w; }
+#endif
 
 // material state
 uniform vec4 occFrontMaterial[5];