Merge pull request #2 from abokinsky/master

Dual Depth Peeling Dragon Demo

26 files changed, 505 insertions, 0 deletions

diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_fragment.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_fragment.glsl
new file mode 100644
index 0000000..3ba7cf9
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_fragment.glsl
@@ -0,0 +1,17 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT TempTex;
+
+void main(void)
+{
+	gl_FragColor = textureRect(TempTex, gl_FragCoord.xy);
+	// for occlusion query
+	if (gl_FragColor.a == 0) discard;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_vertex.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_vertex.glsl
new file mode 100644
index 0000000..1d0edfc
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_blend_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_final_fragment.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_final_fragment.glsl
new file mode 100644
index 0000000..ec57117
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_final_fragment.glsl
@@ -0,0 +1,28 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT DepthBlenderTex;
+uniform samplerRECT FrontBlenderTex;
+uniform samplerRECT BackBlenderTex;
+
+void main(void)
+{
+	vec4 frontColor = textureRect(FrontBlenderTex, gl_FragCoord.xy);
+	vec3 backColor = textureRect(BackBlenderTex, gl_FragCoord.xy).rgb;
+	float alphaMultiplier = 1.0 - frontColor.w;
+
+	// front + back
+	gl_FragColor.rgb = frontColor + backColor * alphaMultiplier;
+	
+	// front blender
+	//gl_FragColor.rgb = frontColor + vec3(alphaMultiplier);
+	
+	// back blender
+	//gl_FragColor.rgb = backColor;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_final_vertex.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_final_vertex.glsl
new file mode 100644
index 0000000..1d0edfc
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_final_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_init_fragment.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_init_fragment.glsl
new file mode 100644
index 0000000..1c6234a
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_init_fragment.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+	gl_FragColor.xy = vec2(-gl_FragCoord.z, gl_FragCoord.z);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_init_vertex.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_init_vertex.glsl
new file mode 100644
index 0000000..583aad4
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_init_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = ftransform();
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_fragment.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_fragment.glsl
new file mode 100644
index 0000000..2d61b89
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_fragment.glsl
@@ -0,0 +1,67 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// 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;
+	}
+}
diff --git a/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_vertex.glsl b/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_vertex.glsl
new file mode 100644
index 0000000..b49aeff
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/dual_peeling_peel_vertex.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Dual Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex();
+
+void main(void)
+{
+	gl_Position = ftransform();
+	gl_TexCoord[0].xyz = ShadeVertex();
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_blend_fragment.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_blend_fragment.glsl
new file mode 100644
index 0000000..81385aa
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_blend_fragment.glsl
@@ -0,0 +1,15 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT TempTex;
+
+void main(void)
+{
+	gl_FragColor = textureRect(TempTex, gl_FragCoord.xy);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_blend_vertex.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_blend_vertex.glsl
new file mode 100644
index 0000000..817857b
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_blend_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_final_fragment.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_final_fragment.glsl
new file mode 100644
index 0000000..dbc9a65
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_final_fragment.glsl
@@ -0,0 +1,17 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT ColorTex;
+uniform vec3 BackgroundColor;
+
+void main(void)
+{
+	vec4 frontColor = textureRect(ColorTex, gl_FragCoord.xy);
+	gl_FragColor.rgb = frontColor + BackgroundColor * frontColor.a;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_final_vertex.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_final_vertex.glsl
new file mode 100644
index 0000000..817857b
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_final_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_init_fragment.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_init_fragment.glsl
new file mode 100644
index 0000000..fdaaa79
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_init_fragment.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec4 ShadeFragment();
+
+void main(void)
+{
+	vec4 color = ShadeFragment();
+	gl_FragColor = vec4(color.rgb * color.a, 1.0 - color.a);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_init_vertex.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_init_vertex.glsl
new file mode 100644
index 0000000..b005d0c
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_init_vertex.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex();
+
+void main(void)
+{
+	gl_Position = ftransform();
+	gl_TexCoord[0].xyz = ShadeVertex();
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_peel_fragment.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_peel_fragment.glsl
new file mode 100644
index 0000000..7f58b3e
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_peel_fragment.glsl
@@ -0,0 +1,25 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT DepthTex;
+
+vec4 ShadeFragment();
+
+void main(void)
+{
+	// Bit-exact comparison between FP32 z-buffer and fragment depth
+	float frontDepth = textureRect(DepthTex, gl_FragCoord.xy).r;
+	if (gl_FragCoord.z <= frontDepth) {
+		discard;
+	}
+	
+	// Shade all the fragments behind the z-buffer
+	vec4 color = ShadeFragment();
+	gl_FragColor = vec4(color.rgb * color.a, color.a);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/front_peeling_peel_vertex.glsl b/src/demos/dualDepthPeeling/shaders/front_peeling_peel_vertex.glsl
new file mode 100644
index 0000000..b005d0c
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/front_peeling_peel_vertex.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Depth Peeling
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex();
+
+void main(void)
+{
+	gl_Position = ftransform();
+	gl_TexCoord[0].xyz = ShadeVertex();
+}
diff --git a/src/demos/dualDepthPeeling/shaders/shade_fragment.glsl b/src/demos/dualDepthPeeling/shaders/shade_fragment.glsl
new file mode 100644
index 0000000..94f8dcc
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/shade_fragment.glsl
@@ -0,0 +1,40 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency Fragment Shader
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform float Alpha;
+
+#define COLOR_FREQ 30.0
+#define ALPHA_FREQ 30.0
+
+#if 1
+vec4 ShadeFragment()
+{
+	float xWorldPos = gl_TexCoord[0].x;
+	float yWorldPos = gl_TexCoord[0].y;
+	float diffuse = gl_TexCoord[0].z;
+
+	vec4 color;
+	float i = floor(xWorldPos * COLOR_FREQ);
+	float j = floor(yWorldPos * ALPHA_FREQ);
+	color.rgb = (fmod(i, 2.0) == 0) ? vec3(.4,.85,.0) : vec3(1.0);
+	//color.a = (fmod(j, 2.0) == 0) ? Alpha : 0.2;
+	color.a = Alpha;
+
+	color.rgb *= diffuse;
+	return color;
+}
+#else
+vec4 ShadeFragment()
+{
+	vec4 color;
+	color.rgb = vec3(.4,.85,.0);
+	color.a = Alpha;
+	return color;
+}
+#endif
diff --git a/src/demos/dualDepthPeeling/shaders/shade_vertex.glsl b/src/demos/dualDepthPeeling/shaders/shade_vertex.glsl
new file mode 100644
index 0000000..2f0a4ba
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/shade_vertex.glsl
@@ -0,0 +1,14 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency Vertex Shader
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex()
+{
+	float diffuse = abs(normalize(gl_NormalMatrix * gl_Normal).z);
+	return vec3(gl_Vertex.xy, diffuse);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wavg_final_fragment.glsl b/src/demos/dualDepthPeeling/shaders/wavg_final_fragment.glsl
new file mode 100644
index 0000000..034491c
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wavg_final_fragment.glsl
@@ -0,0 +1,29 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Average Color
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT ColorTex0;
+uniform samplerRECT ColorTex1;
+uniform vec3 BackgroundColor;
+
+void main(void)
+{
+	vec4 SumColor = textureRect(ColorTex0, gl_FragCoord.xy);
+	float n = textureRect(ColorTex1, gl_FragCoord.xy).r;
+
+	if (n == 0.0) {
+		gl_FragColor.rgb = BackgroundColor;
+		return;
+	}
+
+	vec3 AvgColor = SumColor.rgb / SumColor.a;
+	float AvgAlpha = SumColor.a / n;
+
+	float T = pow(1.0-AvgAlpha, n);
+	gl_FragColor.rgb = AvgColor * (1 - T) + BackgroundColor * T;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wavg_final_vertex.glsl b/src/demos/dualDepthPeeling/shaders/wavg_final_vertex.glsl
new file mode 100644
index 0000000..5c07236
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wavg_final_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Average Color
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wavg_init_fragment.glsl b/src/demos/dualDepthPeeling/shaders/wavg_init_fragment.glsl
new file mode 100644
index 0000000..e50aeb0
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wavg_init_fragment.glsl
@@ -0,0 +1,19 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Average Color
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+#extension ARB_draw_buffers : require
+
+vec4 ShadeFragment();
+
+void main(void)
+{
+	vec4 color = ShadeFragment();
+	gl_FragData[0] = vec4(color.rgb * color.a, color.a);
+	gl_FragData[1] = vec4(1.0);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wavg_init_vertex.glsl b/src/demos/dualDepthPeeling/shaders/wavg_init_vertex.glsl
new file mode 100644
index 0000000..3d3d25a
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wavg_init_vertex.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Average Color
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex();
+
+void main(void)
+{
+	gl_Position = ftransform();
+	gl_TexCoord[0].xyz = ShadeVertex();
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wsum_final_fragment.glsl b/src/demos/dualDepthPeeling/shaders/wsum_final_fragment.glsl
new file mode 100644
index 0000000..76c0293
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wsum_final_fragment.glsl
@@ -0,0 +1,18 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Weighted Sums
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+uniform samplerRECT ColorTex;
+uniform vec3 BackgroundColor;
+
+// Sum(A_i * C_i) + C_bg * (1 - Sum(A_i))
+void main(void)
+{
+	vec4 S = textureRect(ColorTex, gl_FragCoord.xy);
+	gl_FragColor.rgb = S.rgb + BackgroundColor * (1.0 - S.a);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wsum_final_vertex.glsl b/src/demos/dualDepthPeeling/shaders/wsum_final_vertex.glsl
new file mode 100644
index 0000000..8264811
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wsum_final_vertex.glsl
@@ -0,0 +1,13 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Weighted Sums
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+void main(void)
+{
+     gl_Position = gl_ModelViewMatrix * gl_Vertex;
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wsum_init_fragment.glsl b/src/demos/dualDepthPeeling/shaders/wsum_init_fragment.glsl
new file mode 100644
index 0000000..5cccb14
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wsum_init_fragment.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Weighted Sums
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec4 ShadeFragment();
+
+void main(void)
+{
+	vec4 color = ShadeFragment();
+	gl_FragColor = vec4(color.rgb * color.a, color.a);
+}
diff --git a/src/demos/dualDepthPeeling/shaders/wsum_init_vertex.glsl b/src/demos/dualDepthPeeling/shaders/wsum_init_vertex.glsl
new file mode 100644
index 0000000..5445325
--- /dev/null
+++ b/src/demos/dualDepthPeeling/shaders/wsum_init_vertex.glsl
@@ -0,0 +1,16 @@
+//--------------------------------------------------------------------------------------
+// Order Independent Transparency with Weighted Sums
+//
+// Author: Louis Bavoil
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+//--------------------------------------------------------------------------------------
+
+vec3 ShadeVertex();
+
+void main(void)
+{
+	gl_Position = ftransform();
+	gl_TexCoord[0].xyz = ShadeVertex();
+}