OpenGL ES 3.0 Vertex coloring tool (2), opengles

OpenGL ES 3.0 Vertex coloring tool (2), opengles

# Version 300 esuniform mat4 u_mvpMatrix; in vec4 a_position; in vec4 a_color;
Out vec4 v_color;
Void main () {v_color = a_color; gl_Position = u_mvpMatrix * a_position ;}

The above is a piece of vertex coloring code.

# Version 300 es

The first line in the vertex coloring file indicates that the color language version is 3.0 (shading language 3.0)

Uniform mat4 u_mvpMatrix;

Create an uniform variable u_mvpMatrix for storing the projection matrix of the composite model view.

In vec4 a_position; in vec4 a_color;

Input to the vertex shader as the attribute of the vertex shader.

A_position is the position attribute 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 automatic declaration variable, and the colorant must write the transformed position and pass it to it.

Void main is the entry point of a vertex or fragment shader.

V_color = a_color;

We read the vertex attribute input a_color and write its vertex color output v_color.

Gl_Position = u_mvpMatrix * a_position;

Use gl_Position to change the vertex position.