I'm using OpenGL 1.4 and GLSL 1.2 via ARB-extensions. Tried to set opacity using uniform variable to vertex shader and assign it to varying variable to use it in fragment shader—surly I see gradient-like opacity (that I don't want), 'cause of varying variable.
Vertex shader looks like:
uniform float opacity;
varying float vopacity;
void main() {
vopacity = opacity;
gl_Position = gl_Vertex;
gl_TexCoord[0] = gl_MultiTexCoord0;
}
and fragment one like:
uniform sampler2D tex;
varying float vopacity;
void main() {
vec4 color = texture2D(tex, gl_TexCoord[0].st);
if (color.a > 0.01)
color.a = vopacity;
//color.a = 0.4; // that works as I want, but it's not a variable
gl_FragColor = color;
}Googled this pretty simple problem all the day without success. I'd be glad if someone point me to the right way.
Thank you!
P.S. to admin/moderator: if I chose the wrong forum section—please move it to "For beginners".
