Question

我使用纹理altas和此顶点着色器在四边形上渲染纹理：

    "uniform mat4 uMVPMatrix;" +
    "attribute vec4 vPosition;" +
    "attribute vec4 a_Color;" +
    "attribute vec2 a_texCoord;" +
    "varying vec4 v_Color;" + 
    "varying vec2 v_texCoord;" +
    "uniform vec4 u_newColor;" +

    "void main() {" +
    "  float offset = 0.33;" +
    "  gl_Position = uMVPMatrix * vPosition;" +
    "  v_texCoord.x = a_texCoord.x + offset;" +
    "  v_texCoord.y = a_texCoord.y + offset;" +
    "  v_Color = u_newColor;" + 
    "}";

一切正常，我在纹理中渲染第三个，在地图集中显示9的中间拼贴。除了我想要＆＃39;抵消＆＃39;成为一个变量，即我想根据哪个＆＃39;平铺来改变它？我需要纹理图集。

这怎么可能？

Answer 1

添加制服并使用：

"uniform mat4 uMVPMatrix;" +
"attribute vec4 vPosition;" +
"attribute vec4 a_Color;" +
"attribute vec2 a_texCoord;" +
"varying vec4 v_Color;" + 
"varying vec2 v_texCoord;" +
"uniform vec4 u_newColor;" +
"uniform vec2 u_offset ;" + //vec2 so there is a x and y component that you can set

"void main() {" +
"  gl_Position = uMVPMatrix * vPosition;" +
"  v_texCoord = a_texCoord + u_offset;" +
"  v_Color = u_newColor;" + 
"}";

然后用

设置制服

glUniform2f(u_offset_location, xTile, yTile);

opengles在着色器中偏移纹理坐标

1 个答案: