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Member Since 19 Sep 2011
Offline Last Active Oct 01 2011 09:39 AM

Topics I've Started

"Beginning OpenGL Game Programming 2nd edition" fragment shader compile problems

19 September 2011 - 03:11 PM

Hi guys, I'm hoping smeone can give me some advice.
I recently got "Beginning OpenGL Game Programming 2nd edition" by Luke Bernstead.

The first thing i have been doing is doing is reading through and compiling / running the projects.
When I get to the first one with a fragment shader (Chapter 6) however, it bombs out. After some debugging, I've narrowed it down to the fragment shader.

this is the supplied shader:

#version 130

in vec4 color;
out vec4 outColor;

void main(void) {
	outColor = color;	

I tried changing the shader to something like this, which allows the program to run but everything is rendered black:
void main()
	gl_FragColor = gl_Color;
[as far as I can tell this is deprecated anyway]

I also mentioned the vert shader works; here it is:
#version 130

uniform mat4 projection_matrix;
uniform mat4 modelview_matrix;

in vec3 a_Vertex;
in vec3 a_Color;
out vec4 color;

void main(void) 
	vec4 pos = modelview_matrix * vec4(a_Vertex, 1.0);
	gl_Position = projection_matrix * pos;	
	color = vec4(a_Color, 1.0);

When I investigate what glGetShaderInfoLog says, all i get is:

- Fragment Shader Fai

useful, huh?

Unfortunately, I'm new to this whole thing and after a lot of searching on-line I'm still at an impasse. I hoping by posting here someone would be able to help me.

Oh yeah, my laptop's graphics card is: ATI Radeon HD 4500 series. I ran GPUCapsViewer; which told me that the card is fully shader version 1.3 compatible.

Any help appreciated, am i doing something wrong?!