Shaders and gl_Vertex - CopperLicht Forum

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	Shaders and gl_Vertex

walzuu Registered User
Quote
2011-07-15 12:45:36

Hi,

I tried using gl_Vertex in the vertex shader, but it doesn't seem to work in Copperlicht. When using it in the tutorial 5 it gives this error message:

Error loading vertex shader: ERROR: 0:4: 'gl_Vertex' : undeclared identifier
Could not create shader program

Got any ideas what I'm doing wrong? Here's the shader:

var vertex_shader_source = "\
		   ifdef GL_ES                    \n\
		   precision highp float;          \n\
		   endif                          \n\
		   uniform mat4 worldviewproj;     \
		   attribute vec4 vPosition;       \
		   attribute vec4 vNormal;         \
		   attribute vec2 vTexCoord1;      \
		   attribute vec2 vTexCoord2;      \
		   varying vec2 v_texCoord1;       \
		   varying vec2 v_texCoord2;       \
		   void main()                     \
		   {                               \
		    vec4 v = vec4(gl_Vertex);    \
			gl_Position = worldviewproj * vPosition;\
			v_texCoord1 = vTexCoord1.st;   \
			v_texCoord2 = vTexCoord2.st;   \
		   }";

If I change the gl_Vertex to gl_Position, it compiles just fine.

niko Moderator
Quote
2011-07-15 13:28:10

Hm, gl_Vertex doesn't work, no.Not sure why it should, though? Just use gl_Position.

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