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-rw-r--r--examples/OpenGLWindow/Shaders/linesVS.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/examples/OpenGLWindow/Shaders/linesVS.h b/examples/OpenGLWindow/Shaders/linesVS.h
index 8fc6eb3e7..0054b14cf 100644
--- a/examples/OpenGLWindow/Shaders/linesVS.h
+++ b/examples/OpenGLWindow/Shaders/linesVS.h
@@ -5,10 +5,11 @@ static const char* linesVertexShader= \
"uniform mat4 ProjectionMatrix;\n"
"uniform vec4 colour;\n"
"in vec4 position;\n"
+"in vec4 colourIn;\n"
"out vec4 colourV;\n"
"void main (void)\n"
"{\n"
-" colourV = colour;\n"
+" colourV = (colour[3] == -1) ? colourIn : colour;\n"
" gl_Position = ProjectionMatrix * ModelViewMatrix * position;\n"
" \n"
"}\n"