Manual

Examples

Multitexture

The following code sample shows how shaders can access two different textures simultaneously using two sampler2D uniform variables.

The command to run this example would be:

<texture file="crate.jpg" name="crate">
<texture file="stone.jpg" name="stone">
    <program>
        <shader file="multitexture.vert" />
        <shader file="multitexture.frag" />
        <translate x="-1.0">
            <box>
                <uniform type="mat4" name="MVPMatrix" />
                <uniform type="sampler2D" name="left" link="crate" />
                <uniform type="sampler2D" name="right" link="stone" />
            </box>
        </translate>
        <translate x="+1.0">
            <box>
                <uniform type="mat4" name="MVPMatrix" />
                <uniform type="sampler2D" name="left" link="stone" />
                <uniform type="sampler2D" name="right" link="crate" />
            </box>
        </translate>
    </program>
</texture>
</texture>

#version 130
uniform mat4 MVPMatrix;
in vec4 MCVertex;
in vec3 TexCoord0;
out vec3 TexCoord;

void main() {
	TexCoord = TexCoord0;
	gl_Position = MVPMatrix * MCVertex;
}

#version 130
uniform sampler2D left, right;
in vec3 TexCoord;
out vec4 FragColor;

void main() {
	if (TexCoord.s < 0.5) {
		FragColor = texture(left, TexCoord.st);
	} else {
		FragColor = texture(right, TexCoord.st);
	}
}