Merge pull request #45 from dariomanesku/master

Added examples 13-stencil and 14-shadowvolumes.

examples/13-stencil/fs_stencil_color_black.sc

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
+}

examples/13-stencil/fs_stencil_color_lightning.sc

@@ -0,0 +1,79 @@
+$input v_normal, v_view
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_params;
+uniform vec3 u_ambient;
+uniform vec3 u_diffuse;
+uniform vec4 u_color;
+uniform vec4 u_specular_shininess;
+uniform vec4 u_lightPosRadius[5];
+uniform vec4 u_lightRgbInnerR[5];
+
+#define u_ambientPass   u_params.x
+#define u_lightningPass u_params.y
+#define u_alpha         u_params.z
+#define u_lightCount    u_params.w
+#define u_specular      u_specular_shininess.xyz
+#define u_shininess     u_specular_shininess.w
+
+vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
+{
+	float ndotl = dot(_normal, _lightDir);
+	vec3 reflected = 2.0*ndotl*_normal - _lightDir; // reflect(_lightDir, _normal);
+	float rdotv = dot(reflected, _viewDir);
+	return vec2(ndotl, rdotv);
+}
+
+vec4 lit(float _ndotl, float _rdotv, float _m)
+{
+	float diff = max(0.0, _ndotl);
+	float spec = step(0.0, _ndotl) * pow(max(0.0, _rdotv), _m);
+	return vec4(1.0, diff, spec, 1.0);
+}
+
+vec3 calcLight(int _idx, vec3 _view, vec3 _normal, vec3 _viewDir)
+{
+	if (float(_idx) >= u_lightCount)
+		return vec3_splat(0.0);
+
+	vec3 lightPos = mul(u_view, vec4(u_lightPosRadius[_idx].xyz, 1.0)).xyz;
+	vec3 toLight = lightPos - _view;
+	vec3 lightDir = normalize(toLight);
+
+	vec2 bln = blinn(lightDir, _normal, _viewDir);
+	vec4 lc = lit(bln.x, bln.y, u_shininess);
+
+	float dist = max(length(toLight), u_lightPosRadius[_idx].w);
+	float attn = 100.0 * pow(dist, -2.0);
+	vec3 rgb = (lc.y * u_diffuse + lc.z * u_specular) * u_lightRgbInnerR[_idx].rgb * attn;
+
+	return rgb;
+}
+
+void main()
+{
+	vec3 normal = normalize(v_normal);
+	vec3 viewDir = -normalize(v_view);
+
+	vec3 ambientColor = u_ambient * u_ambientPass;
+
+	vec3 lightColor = vec3_splat(0.0);
+	for(int ii = 0; ii < 5; ++ii)
+	{
+		lightColor += calcLight(ii, v_view, normal, viewDir);
+	}
+	lightColor *= u_lightningPass;
+
+	vec3 color = u_color.xyz;
+
+	vec3 ambient = toGamma(ambientColor * color);
+	vec3 diffuse = toGamma(lightColor * color);
+	gl_FragColor.xyz = clamp(ambient + diffuse, 0.0, 1.0);
+
+	gl_FragColor.w = u_alpha;
+}

examples/13-stencil/fs_stencil_color_texture.sc

@@ -0,0 +1,22 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_color;
+SAMPLER2D(u_texColor, 0);
+
+void main()
+{
+	vec4 tcolor = toLinear(texture2D(u_texColor, v_texcoord0));
+
+	if (tcolor.x < 0.1) //OK for now.
+	{
+		discard;
+	}
+
+	gl_FragColor = toGamma(tcolor + u_color);
+}

examples/13-stencil/fs_stencil_texture.sc

@@ -0,0 +1,14 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+SAMPLER2D(u_texColor, 0);
+
+void main()
+{
+	gl_FragColor = texture2D(u_texColor, v_texcoord0);
+}

examples/13-stencil/fs_stencil_texture_lightning.sc

@@ -0,0 +1,80 @@
+$input v_normal, v_view, v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_params;
+uniform vec3 u_ambient;
+uniform vec3 u_diffuse;
+uniform vec4 u_color;
+uniform vec4 u_specular_shininess;
+uniform vec4 u_lightPosRadius[5];
+uniform vec4 u_lightRgbInnerR[5];
+SAMPLER2D(u_texColor, 0);
+
+#define u_ambientPass   u_params.x
+#define u_lightningPass u_params.y
+#define u_alpha         u_params.z
+#define u_lightCount    u_params.w
+#define u_specular      u_specular_shininess.xyz
+#define u_shininess     u_specular_shininess.w
+
+vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
+{
+	float ndotl = dot(_normal, _lightDir);
+	vec3 reflected = 2.0*ndotl*_normal - _lightDir; // reflect(_lightDir, _normal);
+	float rdotv = dot(reflected, _viewDir);
+	return vec2(ndotl, rdotv);
+}
+
+vec4 lit(float _ndotl, float _rdotv, float _m)
+{
+	float diff = max(0.0, _ndotl);
+	float spec = step(0.0, _ndotl) * pow(max(0.0, _rdotv), _m);
+	return vec4(1.0, diff, spec, 1.0);
+}
+
+vec3 calcLight(int _idx, vec3 _view, vec3 _normal, vec3 _viewDir)
+{
+	if (float(_idx) >= u_lightCount)
+		return vec3_splat(0.0);
+
+	vec3 lightPos = mul(u_view, vec4(u_lightPosRadius[_idx].xyz, 1.0)).xyz;
+	vec3 toLight = lightPos - _view;
+	vec3 lightDir = normalize(toLight);
+
+	vec2 bln = blinn(lightDir, _normal, _viewDir);
+	vec4 lc = lit(bln.x, bln.y, u_shininess);
+
+	float dist = max(length(toLight), u_lightPosRadius[_idx].w);
+	float attn = 100.0 * pow(dist, -2.0);
+	vec3 rgb = (lc.y * u_diffuse + lc.z * u_specular) * u_lightRgbInnerR[_idx].rgb * attn;
+
+	return rgb;
+}
+
+void main()
+{
+	vec3 normal = normalize(v_normal);
+	vec3 viewDir = -normalize(v_view);
+
+	vec3 ambientColor = u_ambient * u_ambientPass;
+
+	vec3 lightColor = vec3_splat(0.0);
+	for(int ii = 0; ii < 5; ++ii)
+	{
+		lightColor += calcLight(ii, v_view, normal, viewDir);
+	}
+	lightColor *= u_lightningPass;
+
+	vec3 color = toLinear(texture2D(u_texColor, v_texcoord0)).xyz;
+
+	vec3 ambient = toGamma(ambientColor * color);
+	vec3 diffuse = toGamma(lightColor * color);
+	gl_FragColor.xyz = clamp(ambient + diffuse, 0.0, 1.0);
+
+	gl_FragColor.w = u_alpha;
+}

examples/13-stencil/makefile

@@ -0,0 +1,22 @@
+#
+# Copyright 2013 Dario Manesku. All rights reserved.
+# License: http://www.opensource.org/licenses/BSD-2-Clause
+#
+
+BGFX_DIR=../..
+RUNTIME_DIR=$(BGFX_DIR)/examples/runtime
+BUILD_DIR=../../.build
+
+include $(BGFX_DIR)/premake/shader.mk
+
+geometry: ../runtime/meshes/column.bin
+
+../runtime/meshes/column.bin: column.obj
+	../../tools/bin/geometryc -f column.obj -o ../runtime/meshes/column.bin --packnormal 1
+
+rebuild:
+	@make -s --no-print-directory TARGET=0 clean all
+	@make -s --no-print-directory TARGET=1 clean all
+	@make -s --no-print-directory TARGET=2 clean all
+	@make -s --no-print-directory TARGET=3 clean all
+	@make -s --no-print-directory TARGET=4 clean all

examples/13-stencil/varying.def.sc

@@ -0,0 +1,7 @@
+vec2 v_texcoord0 : TEXCOORD0 = vec2(0.0, 0.0);
+vec3 v_view      : TEXCOORD1 = vec3(0.0, 0.0, 0.0);
+vec3 v_normal    : NORMAL    = vec3(0.0, 0.0, 1.0);
+
+vec3 a_position  : POSITION;
+vec4 a_normal    : NORMAL;
+vec2 a_texcoord0 : TEXCOORD0;

examples/13-stencil/vs_stencil_color.sc

@@ -0,0 +1,13 @@
+$input a_position
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+}

examples/13-stencil/vs_stencil_color_lightning.sc

@@ -0,0 +1,18 @@
+$input a_position, a_normal, a_texcoord0
+$output  v_normal, v_view
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	vec4 normal = a_normal * 2.0f - 1.0f;
+	v_normal = mul(u_modelView, vec4(normal.xyz, 0.0)).xyz;
+	v_view = mul(u_modelView, vec4(a_position, 1.0)).xyz;
+}

examples/13-stencil/vs_stencil_color_texture.sc

@@ -0,0 +1,16 @@
+$input a_position, a_texcoord0
+$output v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+    v_texcoord0 = a_texcoord0;
+}

examples/13-stencil/vs_stencil_texture.sc

@@ -0,0 +1,16 @@
+$input a_position, a_texcoord0
+$output v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+    v_texcoord0 = a_texcoord0;
+}

examples/13-stencil/vs_stencil_texture_lightning.sc

@@ -0,0 +1,20 @@
+$input a_position, a_normal, a_texcoord0
+$output  v_normal, v_view, v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	vec4 normal = a_normal * 2.0f - 1.0f;
+	v_normal = mul(u_modelView, vec4(normal.xyz, 0.0)).xyz;
+	v_view = mul(u_modelView, vec4(a_position, 1.0)).xyz;
+
+    v_texcoord0 = a_texcoord0;
+}

examples/14-shadowvolumes/fs_shadowvolume_color_lightning.sc

@@ -0,0 +1,88 @@
+$input v_normal, v_view, v_pos
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_params;
+uniform vec4 u_svparams;
+uniform vec3 u_ambient;
+uniform vec3 u_diffuse;
+uniform vec4 u_color;
+uniform vec4 u_specular_shininess;
+uniform vec4 u_fog;
+uniform vec4 u_lightPosRadius;
+uniform vec4 u_lightRgbInnerR;
+SAMPLER2D(u_texStencil, 7);
+
+#define u_ambientPass   u_params.x
+#define u_lightningPass u_params.y
+#define u_alpha         u_params.z
+#define u_specular      u_specular_shininess.xyz
+#define u_shininess     u_specular_shininess.w
+
+#define u_fogColor      u_fog.xyz
+#define u_fogDensity    u_fog.w
+
+#define u_useStencilTex u_svparams.x
+
+vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
+{
+	float ndotl = dot(_normal, _lightDir);
+	vec3 reflected = 2.0*ndotl*_normal - _lightDir; // reflect(_lightDir, _normal);
+	float rdotv = dot(reflected, _viewDir);
+	return vec2(ndotl, rdotv);
+}
+
+vec4 lit(float _ndotl, float _rdotv, float _m)
+{
+	float diff = max(0.0, _ndotl);
+	float spec = step(0.0, _ndotl) * pow(max(0.0, _rdotv), _m);
+	return vec4(1.0, diff, spec, 1.0);
+}
+
+vec3 calcLight(vec3 _view, vec3 _normal, vec3 _viewDir)
+{
+	vec3 lightPos = mul(u_view, vec4(u_lightPosRadius.xyz, 1.0)).xyz;
+	vec3 toLight = lightPos - _view;
+	vec3 lightDir = normalize(toLight);
+
+	vec2 bln = blinn(lightDir, _normal, _viewDir);
+	vec4 lc = lit(bln.x, bln.y, u_shininess);
+
+	float dist = max(length(toLight), u_lightPosRadius.w);
+	float attn = 50.0 * pow(dist, -2.0);
+	vec3 rgb = (lc.y * u_diffuse + lc.z * u_specular) * u_lightRgbInnerR.rgb * attn;
+
+	return rgb;
+}
+
+void main()
+{
+	vec3 ambientColor = u_ambient * u_ambientPass;
+
+	vec3 normal = normalize(v_normal);
+	vec3 viewDir = -normalize(v_view);
+	vec3 lightColor = calcLight(v_view, normal, viewDir) * u_lightningPass;
+
+	vec2 ndc = ((v_pos.xy / v_pos.w) + 1.0) / 2.0;
+	vec4 texcolor = texture2D(u_texStencil, ndc);
+	float s = (texcolor.x - texcolor.y) + 2.0 * (texcolor.z - texcolor.w);
+	s *= u_useStencilTex;
+
+	const float LOG2 = 1.442695;
+	float z = length(v_view);
+	float fogFactor = 1.0/exp2(u_fogDensity*u_fogDensity*z*z*LOG2);
+	fogFactor = clamp(fogFactor, 0.0, 1.0);
+
+	vec3 color = u_color.xyz;
+
+	vec3 ambient = toGamma(ambientColor * color);
+	vec3 diffuse = toGamma(lightColor * color);
+	vec3 final   = mix(ambient, ambient + diffuse, float((abs(s) < 0.0001)));
+
+	gl_FragColor.xyz = mix(u_fogColor, final, fogFactor);
+	gl_FragColor.w   = u_alpha;
+}

examples/14-shadowvolumes/fs_shadowvolume_color_texture.sc

@@ -0,0 +1,22 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_color;
+SAMPLER2D(u_texColor, 0);
+
+void main()
+{
+	vec4 tcolor = toLinear(texture2D(u_texColor, v_texcoord0));
+
+	if (tcolor.x < 0.1) //OK for now.
+	{
+		discard;
+	}
+
+	gl_FragColor = toGamma(tcolor + u_color);
+}                           

examples/14-shadowvolumes/fs_shadowvolume_svbackblank.sc

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_FragColor = vec4_splat(1.0);
+}

examples/14-shadowvolumes/fs_shadowvolume_svbackcolor.sc

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_color;
+
+void main()
+{
+	gl_FragColor.xyz = u_color.xyz;
+	gl_FragColor.w = 0.98;
+}

examples/14-shadowvolumes/fs_shadowvolume_svbacktex1.sc

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+vec4 stencilColor(float _k)
+{
+	return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
+			  , float(abs(_k + 1.0) < 0.0001)/255.0
+			  , float(abs(_k - 2.0) < 0.0001)/255.0
+			  , float(abs(_k + 2.0) < 0.0001)/255.0
+			  ); 
+}
+
+void main()
+{
+	float k = 1.0;
+	if (!gl_FrontFacing)
+		k = -k;
+
+	gl_FragColor = stencilColor(k);
+}

examples/14-shadowvolumes/fs_shadowvolume_svbacktex2.sc

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+vec4 stencilColor(float _k)
+{
+	return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
+			  , float(abs(_k + 1.0) < 0.0001)/255.0
+			  , float(abs(_k - 2.0) < 0.0001)/255.0
+			  , float(abs(_k + 2.0) < 0.0001)/255.0
+			  ); 
+}
+
+void main()
+{
+	float k = 2.0;
+	if (!gl_FrontFacing)
+		k = -k;
+
+	gl_FragColor = stencilColor(k);
+}

examples/14-shadowvolumes/fs_shadowvolume_svfrontblank.sc

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_FragColor.xyz = vec3_splat(0.0);
+	gl_FragColor.w = 1.0;
+}

examples/14-shadowvolumes/fs_shadowvolume_svfrontcolor.sc

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_color;
+ 
+void main()
+{
+	gl_FragColor.xyz = u_color.xyz;
+	gl_FragColor.w = 0.98;
+}

examples/14-shadowvolumes/fs_shadowvolume_svfronttex1.sc

@@ -0,0 +1,24 @@
+/*
+* Copyright 2013 Dario Manesku. All rights reserved.
+* License: http://www.opensource.org/licenses/BSD-2-Clause
+*/
+
+#include "../common/common.sh"
+
+vec4 stencilColor(float _k)
+{
+   return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
+			 , float(abs(_k + 1.0) < 0.0001)/255.0
+			 , float(abs(_k - 2.0) < 0.0001)/255.0
+			 , float(abs(_k + 2.0) < 0.0001)/255.0
+			 ); 
+}
+
+void main()
+{
+   float k = -1.0;
+   if (gl_FrontFacing)
+	   k = -k;
+
+   gl_FragColor = stencilColor(k);
+}

examples/14-shadowvolumes/fs_shadowvolume_svfronttex2.sc

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+vec4 stencilColor(float _k)
+{
+	return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
+			, float(abs(_k + 1.0) < 0.0001)/255.0
+			, float(abs(_k - 2.0) < 0.0001)/255.0
+			, float(abs(_k + 2.0) < 0.0001)/255.0
+			); 
+}
+
+void main()
+{
+	float k = -2.0;
+	if (gl_FrontFacing)
+		k = -k;
+
+	gl_FragColor = stencilColor(k);
+}

examples/14-shadowvolumes/fs_shadowvolume_svside.sc

@@ -0,0 +1,24 @@
+$input v_k
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+uniform vec3 u_color;
+
+void main()
+{
+	float k = v_k;
+	if (!gl_FrontFacing)
+		k = -k;
+
+	gl_FragColor.xyzw =
+		vec4( float(abs(k - 1.0) < 0.0001)/255.0
+			, float(abs(k + 1.0) < 0.0001)/255.0
+			, float(abs(k - 2.0) < 0.0001)/255.0
+			, float(abs(k + 2.0) < 0.0001)/255.0
+			);
+}

examples/14-shadowvolumes/fs_shadowvolume_svsideblank.sc

@@ -0,0 +1,13 @@
+$input v_k
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+}

examples/14-shadowvolumes/fs_shadowvolume_svsidecolor.sc

@@ -0,0 +1,15 @@
+$input v_k
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_color;
+
+void main()
+{
+	gl_FragColor.xyz = u_color.xyz;
+	gl_FragColor.w = 0.98;
+}

examples/14-shadowvolumes/fs_shadowvolume_svsidetex.sc

@@ -0,0 +1,34 @@
+$input v_k
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+uniform vec4 u_svparams;
+
+#define u_dfail u_svparams.y
+
+vec4 stencilColor(float _k)
+{
+	return vec4(float(abs(_k - 1.0) < 0.0001)/255.0
+			  , float(abs(_k + 1.0) < 0.0001)/255.0
+			  , float(abs(_k - 2.0) < 0.0001)/255.0
+			  , float(abs(_k + 2.0) < 0.0001)/255.0
+			  );
+}
+
+void main()
+{
+	float k = v_k;
+
+	if (!gl_FrontFacing)
+		k = -k;
+
+	if (u_dfail == 0.0)
+		k = -k;
+
+	gl_FragColor = stencilColor(k);
+}

examples/14-shadowvolumes/fs_shadowvolume_texture.sc

@@ -0,0 +1,14 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+SAMPLER2D(u_texColor, 0);
+
+void main()
+{
+	gl_FragColor = texture2D(u_texColor, v_texcoord0);
+}

examples/14-shadowvolumes/fs_shadowvolume_texture_lightning.sc

@@ -0,0 +1,90 @@
+$input v_normal, v_view, v_texcoord0, v_pos
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+uniform vec4 u_params;
+uniform vec4 u_svparams;
+uniform vec3 u_ambient;
+uniform vec3 u_diffuse;
+uniform vec4 u_color;
+uniform vec4 u_specular_shininess;
+uniform vec4 u_fog;
+uniform vec4 u_lightPosRadius;
+uniform vec4 u_lightRgbInnerR;
+SAMPLER2D(u_texColor, 0);
+SAMPLER2D(u_texStencil, 7);
+
+#define u_ambientPass   u_params.x
+#define u_lightningPass u_params.y
+#define u_alpha         u_params.z
+#define u_specular      u_specular_shininess.xyz
+#define u_shininess     u_specular_shininess.w
+
+#define u_fogColor      u_fog.xyz
+#define u_fogDensity    u_fog.w
+
+#define u_useStencilTex u_svparams.x
+
+vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
+{
+	float ndotl = dot(_normal, _lightDir);
+	vec3 reflected = 2.0*ndotl*_normal - _lightDir; // reflect(_lightDir, _normal);
+	float rdotv = dot(reflected, _viewDir);
+	return vec2(ndotl, rdotv);
+}
+
+vec4 lit(float _ndotl, float _rdotv, float _m)
+{
+	float diff = max(0.0, _ndotl);
+	float spec = step(0.0, _ndotl) * pow(max(0.0, _rdotv), _m);
+	return vec4(1.0, diff, spec, 1.0);
+}
+
+vec3 calcLight(vec3 _view, vec3 _normal, vec3 _viewDir)
+{
+	vec3 lightPos = mul(u_view, vec4(u_lightPosRadius.xyz, 1.0)).xyz;
+	vec3 toLight = lightPos - _view;
+	vec3 lightDir = normalize(toLight);
+
+	vec2 bln = blinn(lightDir, _normal, _viewDir);
+	vec4 lc = lit(bln.x, bln.y, u_shininess);
+
+	float dist = max(length(toLight), u_lightPosRadius.w);
+	float attn = 50.0 * pow(dist, -2.0);
+	vec3 rgb = (lc.y * u_diffuse + lc.z * u_specular) * u_lightRgbInnerR.rgb * attn;
+
+	return rgb;
+}
+
+void main()
+{
+	vec3 ambientColor = u_ambient * u_ambientPass;
+
+	vec3 normal = normalize(v_normal);
+	vec3 viewDir = -normalize(v_view);
+	vec3 lightColor = calcLight(v_view, normal, viewDir) * u_lightningPass;
+
+	vec2 ndc = ((v_pos.xy / v_pos.w) + 1.0) / 2.0;
+	vec4 texcolor = texture2D(u_texStencil, ndc);
+	float s = (texcolor.x - texcolor.y) + 2.0 * (texcolor.z - texcolor.w);
+	s *= u_useStencilTex;
+
+	const float LOG2 = 1.442695;
+	float z = length(v_view);
+	float fogFactor = 1.0/exp2(u_fogDensity*u_fogDensity*z*z*LOG2);
+	fogFactor = clamp(fogFactor, 0.0, 1.0);
+
+	vec3 color = toLinear(texture2D(u_texColor, v_texcoord0)).xyz;
+
+	vec3 ambient = toGamma(ambientColor * color);
+	vec3 diffuse = toGamma(lightColor * color);
+	vec3 final   = mix(ambient, ambient + diffuse, float((abs(s) < 0.0001)));
+
+	gl_FragColor.xyz = mix(u_fogColor, final, fogFactor);
+	gl_FragColor.w   = u_alpha;
+}
+

examples/14-shadowvolumes/makefile

@@ -0,0 +1,25 @@
+#
+# Copyright 2013 Dario Manesku. All rights reserved.
+# License: http://www.opensource.org/licenses/BSD-2-Clause
+#
+
+BGFX_DIR=../..
+RUNTIME_DIR=$(BGFX_DIR)/examples/runtime
+BUILD_DIR=../../.build
+
+include $(BGFX_DIR)/premake/shader.mk
+
+geometry: ../runtime/meshes/bunny_patched.bin ../runtime/meshes/bunny_decimated.bin 
+
+../runtime/meshes/bunny_patched.bin: bunny_patched.obj
+	../../tools/bin/geometryc -f bunny_patched.obj -o ../runtime/meshes/bunny_patched.bin --packnormal 1
+
+../runtime/meshes/bunny_decimated.bin: bunny_decimated.obj
+	../../tools/bin/geometryc -f bunny_decimated.obj -o ../runtime/meshes/bunny_decimated.bin --packnormal 1
+
+rebuild:
+	@make -s --no-print-directory TARGET=0 clean all
+	@make -s --no-print-directory TARGET=1 clean all
+	@make -s --no-print-directory TARGET=2 clean all
+	@make -s --no-print-directory TARGET=3 clean all
+	@make -s --no-print-directory TARGET=4 clean all

examples/14-shadowvolumes/varying.def.sc

@@ -0,0 +1,16 @@
+vec2 v_texcoord0 : TEXCOORD0 = vec2(0.0, 0.0);
+vec4 v_pos       : TEXCOORD1 = vec4(0.0, 0.0, 0.0, 1.0);
+vec3 v_normal    : NORMAL    = vec3(0.0, 0.0, 1.0);
+vec3 v_view      : TEXCOORD2 = vec3(0.0, 0.0, 0.0);
+vec4 v_color0    : COLOR0    = vec4(1.0, 0.0, 0.0, 1.0);
+float v_k        : FOG       = 1.0;
+
+vec3 a_position  : POSITION;
+vec4 a_normal    : NORMAL;
+vec4 a_color0    : COLOR0;
+vec2 a_texcoord0 : TEXCOORD0;
+vec4 i_data0     : TEXCOORD3;
+vec4 i_data1     : TEXCOORD4;
+vec4 i_data2     : TEXCOORD5;
+vec4 i_data3     : TEXCOORD6;
+vec4 i_data4     : TEXCOORD7;

examples/14-shadowvolumes/vs_shadowvolume_color_lightning.sc

@@ -0,0 +1,23 @@
+$input a_position, a_color0, a_normal, a_texcoord0
+$output  v_normal, v_view, v_pos
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+uniform float u_flipV;
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	vec4 normal = a_normal * 2.0f - 1.0f;
+	v_normal = mul(u_modelView, vec4(normal.xyz, 0.0)).xyz;
+	v_view = mul(u_modelView, vec4(a_position, 1.0)).xyz;
+
+	v_pos = gl_Position;
+	v_pos.y *= -u_flipV;
+}

examples/14-shadowvolumes/vs_shadowvolume_color_texture.sc

@@ -0,0 +1,17 @@
+$input a_position, a_texcoord0
+$output v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	v_texcoord0 = a_texcoord0;
+}
+

examples/14-shadowvolumes/vs_shadowvolume_svback.sc

@@ -0,0 +1,23 @@
+$input a_position
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+uniform vec4 u_virtualLightPos_extrusionDist;
+
+#define u_virtualLightPos   u_virtualLightPos_extrusionDist.xyz
+#define u_extrusionDistance u_virtualLightPos_extrusionDist.w
+
+void main()
+{
+	vec3 pos = a_position;
+
+	vec3 toLight = pos - u_virtualLightPos;
+	pos += normalize(toLight) * u_extrusionDistance;
+
+	gl_Position = mul(u_modelViewProj, vec4(pos, 1.0));
+}

examples/14-shadowvolumes/vs_shadowvolume_svfront.sc

@@ -0,0 +1,13 @@
+$input a_position
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
+}

examples/14-shadowvolumes/vs_shadowvolume_svside.sc

@@ -0,0 +1,27 @@
+$input a_position, a_texcoord0
+$output v_k
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+uniform vec4 u_virtualLightPos_extrusionDist;
+
+#define u_virtualLightPos   u_virtualLightPos_extrusionDist.xyz
+#define u_extrusionDistance u_virtualLightPos_extrusionDist.w
+
+void main()
+{
+	vec3 pos = a_position;
+	if (a_texcoord0.x == 1.0)
+	{
+		vec3 toLight = pos - u_virtualLightPos;
+		pos += normalize(toLight) * u_extrusionDistance;
+	}
+	gl_Position = mul(u_modelViewProj, vec4(pos, 1.0));
+
+	v_k = a_texcoord0.y;
+}

examples/14-shadowvolumes/vs_shadowvolume_texture.sc

@@ -0,0 +1,16 @@
+$input a_position, a_texcoord0
+$output v_texcoord0
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	v_texcoord0 = a_texcoord0;
+}

examples/14-shadowvolumes/vs_shadowvolume_texture_lightning.sc

@@ -0,0 +1,25 @@
+$input a_position, a_normal, a_texcoord0
+$output  v_normal, v_view, v_texcoord0, v_pos
+
+/*
+ * Copyright 2013 Dario Manesku. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh" 
+
+uniform float u_flipV;
+
+void main()
+{
+	gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
+
+	vec4 normal = a_normal * 2.0f - 1.0f;
+	v_normal = mul(u_modelView, vec4(normal.xyz, 0.0)).xyz;
+	v_view = mul(u_modelView, vec4(a_position, 1.0)).xyz;
+
+	v_texcoord0 = a_texcoord0;
+
+	v_pos = gl_Position;
+	v_pos.y *= -u_flipV;
+}