Texturing - Praise for OpenGL ES 30 Programming Guide - page 255

Table 9-10 Valid Depth Sized Internal Format Combinations for glTexImage2D

internalFormat format type

GL_DEPTH_COMPONENT16 GL_DEPTH_COMPONENT GL_UNSIGNED_SHORT

GL_DEPTH_COMPONENT16 GL_DEPTH_COMPONENT GL_UNSIGNED_INT

GL_DEPTH_COMPONENT24 GL_DEPTH_COMPONENT GL_UNSIGNED_INT

GL_DEPTH_COMPONENT32F GL_DEPTH_COMPONENT GL_FLOAT

GL_DEPTH24_STENCIL8 GL_DEPTH_STENCIL GL_UNSIGNED_INT_24_8

GL_DEPTH32F_STENCIL8 GL_DEPTH_STENCIL GL_FLOAT_32_UNSIGNED_

INT_24_8_REV

Using Textures in a Shader

Now that we have covered the basics of setting up texturing, let's look at
some sample shader code. The vertex-fragment shader pair in Example 9-3
from the Simple_Texture2D sample demonstrates the basics of how 2D
texturing is done in a shader.

Example 9-3 Vertex and Fragment Shaders for Performing 2D Texturing

// Vertex shader
#version 300 es
layout(location = 0) in vec4 a_position;
layout(location = 1) in vec2 a_texCoord;
out vec2 v_texCoord;
void main()
{
gl_Position = a_position;
v_texCoord = a_texCoord;
}

// Fragment shader
#version 300 es
precision mediump float;
in vec2 v_texCoord;
layout(location = 0) out vec4 outColor;
uniform sampler2D s_texture;
void main()
{
outColor = texture( s_texture, v_texCoord );
}