OpenGL ES 3.0 vertex shader (ii)

　

vec4 a_position ;   inch VEC4 A_color;
Out VEC4 V_color;
void== U_mvpmatrix * a_position;}

Above is a vertex shader code.

 + ES

Appears in the first line of the vertex shader file, indicating that the shaded language version is 3.0 (Shading Language 3.0)

Uniform mat4 U_mvpmatrix;

Creates a uniform variable U_mvpmatrix that is used to store the combined model view projection matrix.

inch VEC4 a_position;  in Vec4 a_color;

Input to the vertex shader as a property of the vertex shader.

A_position is the position property of the input vertex, and A_color is the color attribute of the input vertex.

 out VEC4 v_color;

Output vertex color

Gl_position is a built-in auto-declaration variable that the shader must write to the transform location to pass to it.

Void Main is the entry point for a vertex or fragment shader.

V_color = A_color;

We read the Vertex property input A_color write its vertex color output v_color.

gl_position = U_mvpmatrix * a_position;

Change the position of vertices by gl_position.

　

OpenGL ES 3.0 vertex shader (ii)