From aa6b8f66e9a4e919a6a31b4d13ec4beb3055d1c1 Mon Sep 17 00:00:00 2001
From: YunfeiBai <byf1658@gmail.com>
Date: Thu, 3 May 2018 10:46:59 -0700
Subject: [PATCH] Fixed a bug in projective texture shader.

---
 .../OpenGLWindow/Shaders/projectiveTextureInstancingPS.glsl     | 2 +-
 examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.glsl b/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.glsl
index e2da4b4aa..cbcf74d00 100644
--- a/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.glsl
+++ b/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.glsl
@@ -22,7 +22,7 @@ out vec4 color;
 void main(void)
 {
     vec4 projcoords = TextureMVP * vertexPos;
-    vec2 texturecoords = projcoords.xy/max(projcoords.z,0.1);
+    vec2 texturecoords = projcoords.xy/projcoords.w;
 	vec4 texel = fragment.color*texture(Diffuse,texturecoords);
 	vec3 ct,cf;
 	float intensity,at,af;
diff --git a/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.h b/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.h
index 0c5f72438..ce9a8a99e 100644
--- a/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.h
+++ b/examples/OpenGLWindow/Shaders/projectiveTextureInstancingPS.h
@@ -18,7 +18,7 @@ static const char* projectiveTextureInstancingFragmentShader= \
 "void main(void)\n"
 "{\n"
 "    vec4 projcoords = TextureMVP * vertexPos;\n"
-"    vec2 texturecoords = projcoords.xy/max(projcoords.z,0.1);\n"
+"    vec2 texturecoords = projcoords.xy/projcoords.w;\n"
 "	vec4 texel = fragment.color*texture(Diffuse,texturecoords);\n"
 "	vec3 ct,cf;\n"
 "	float intensity,at,af;\n"