From 390ef63a8da4c3e89b2f61526b641b1b2b82f42d Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sat, 18 Feb 2012 16:59:52 +0100
Subject: unify shader names(2)

---
 .../dualDepthPeeling/shader/dual_peeling_peel.fp   | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/demos/dualDepthPeeling/shader/dual_peeling_peel.fp

(limited to 'src/demos/dualDepthPeeling/shader/dual_peeling_peel.fp')

diff --git a/src/demos/dualDepthPeeling/shader/dual_peeling_peel.fp b/src/demos/dualDepthPeeling/shader/dual_peeling_peel.fp
new file mode 100644
index 0000000..2d61b89
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shader/dual_peeling_peel.fp
@@ -0,0 +1,67 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: sdkfeedback@nvidia.com
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+#extension ARB_draw_buffers : require
+
+uniform samplerRECT DepthBlenderTex;
+uniform samplerRECT FrontBlenderTex;
+
+#define MAX_DEPTH 1.0
+
+vec4 ShadeFragment();
+
+void main(void)
+{
+	// window-space depth interpolated linearly in screen space
+	float fragDepth = gl_FragCoord.z;
+
+	vec2 depthBlender = textureRect(DepthBlenderTex, gl_FragCoord.xy).xy;
+	vec4 forwardTemp = textureRect(FrontBlenderTex, gl_FragCoord.xy);
+	
+	// Depths and 1.0-alphaMult always increase
+	// so we can use pass-through by default with MAX blending
+	gl_FragData[0].xy = depthBlender;
+	
+	// Front colors always increase (DST += SRC*ALPHA_MULT)
+	// so we can use pass-through by default with MAX blending
+	gl_FragData[1] = forwardTemp;
+	
+	// Because over blending makes color increase or decrease,
+	// we cannot pass-through by default.
+	// Each pass, only one fragment writes a color greater than 0
+	gl_FragData[2] = vec4(0.0);
+
+	float nearestDepth = -depthBlender.x;
+	float farthestDepth = depthBlender.y;
+	float alphaMultiplier = 1.0 - forwardTemp.w;
+
+	if (fragDepth < nearestDepth || fragDepth > farthestDepth) {
+		// Skip this depth in the peeling algorithm
+		gl_FragData[0].xy = vec2(-MAX_DEPTH);
+		return;
+	}
+	
+	if (fragDepth > nearestDepth && fragDepth < farthestDepth) {
+		// This fragment needs to be peeled again
+		gl_FragData[0].xy = vec2(-fragDepth, fragDepth);
+		return;
+	}
+	
+	// If we made it here, this fragment is on the peeled layer from last pass
+	// therefore, we need to shade it, and make sure it is not peeled any farther
+	vec4 color = ShadeFragment();
+	gl_FragData[0].xy = vec2(-MAX_DEPTH);
+	
+	if (fragDepth == nearestDepth) {
+		gl_FragData[1].xyz += color.rgb * color.a * alphaMultiplier;
+		gl_FragData[1].w = 1.0 - alphaMultiplier * (1.0 - color.a);
+	} else {
+		gl_FragData[2] += color;
+	}
+}
-- 
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