From: kgv <kgv@opencascade.com>
Date: Wed, 9 Sep 2015 11:24:21 +0000 (+0300)
Subject: 0026672: Visualization, TKOpenGl - workaround mobile hardware with extremely low... 
X-Git-Tag: V6_9_1~34
X-Git-Url: http://git.dev.opencascade.org/gitweb/?a=commitdiff_plain;h=f2f478782fb78000820b08b201e8dafcaa614a20;p=occt-copy.git

0026672: Visualization, TKOpenGl - workaround mobile hardware with extremely low precision of mod() in GLSL
---

diff --git a/src/OpenGl/OpenGl_ShaderManager.cxx b/src/OpenGl/OpenGl_ShaderManager.cxx
index 2643f09e68..87117d4186 100644
--- a/src/OpenGl/OpenGl_ShaderManager.cxx
+++ b/src/OpenGl/OpenGl_ShaderManager.cxx
@@ -1638,7 +1638,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  if (int (mod (gl_FragCoord.y + 1.5, 2.0)) == 1)"
+          EOL"  if (int (mod (gl_FragCoord.y - 1023.5, 2.0)) != 1)"
           EOL"  {"
           EOL"    occFragColor = aColorL;"
           EOL"  }"
@@ -1661,7 +1661,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  if (int (mod (gl_FragCoord.x + 1.5, 2.0)) != 1)"
+          EOL"  if (int (mod (gl_FragCoord.x - 1023.5, 2.0)) == 1)"
           EOL"  {"
           EOL"    occFragColor = aColorL;"
           EOL"  }"
@@ -1684,8 +1684,8 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  bool isEvenX = int(mod(floor(gl_FragCoord.x + 1.5), 2.0)) == 1;"
-          EOL"  bool isEvenY = int(mod(floor(gl_FragCoord.y + 1.5), 2.0)) != 1;"
+          EOL"  bool isEvenX = int(mod(floor(gl_FragCoord.x - 1023.5), 2.0)) != 1;"
+          EOL"  bool isEvenY = int(mod(floor(gl_FragCoord.y - 1023.5), 2.0)) == 1;"
           EOL"  if ((isEvenX && isEvenY) || (!isEvenX && !isEvenY))"
           EOL"  {"
           EOL"    occFragColor = aColorL;"