| // This test checks that a shader cannot read from the internal "css_u_texture" sampler, which references the DOM element texture. |
| // This shader should fail to validate because it defines "css_u_texture", which should be an unbound sampler, |
| // since this shader is not referenced from the CSS mix function. |
| |
| precision mediump float; |
| |
| uniform sampler2D css_u_texture; |
| |
| varying vec2 v_texCoord; |
| |
| void main() |
| { |
| // Try to sample the DOM element texture. |
| vec4 color = texture2D(css_u_texture, v_texCoord); |
| |
| // Swap the red and green channels. |
| color.rg = color.gr; |
| |
| gl_FragColor = color; |
| } |
