my screen is 1920 * 1080, i want draw a cover on screen,
but triangle pionter array only can be set -1 to 1, can not 1 to 1920 or 1080,
if i set 1 to 1920 or 1080, its to big cover the sceen....
i want to set pointer array accordding the screen width or height (1920 or 1080 ) ....
//poor english
//sample code
// create shader program ...........
// const GLfloat triangleVertices[] = { -1, -1, 1, -1, 1, 1, -1, 1}; //eg 2
const GLfloat triangleVertices[] = { 1, 1, 1920, 1, 1920, 1080, 1, 1080}; //eg 2
const GLfloat triangleColor[] = { 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1};
glVertexAttribPointer(vPositionHandle, 2, GL_FLOAT, GL_TRUE, 0, triangleVertices);
glEnableVertexAttribArray(vPositionHandle);
glVertexAttribPointer(vColorHandle, 4, GL_FLOAT, GL_TRUE, 0, triangleColor);
glEnableVertexAttribArray(vColorHandle);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);//GL_TRIANGLES