OpenGL-- Shader 颜色 光照 3 光照贴图 LightMap
光照贴图
原理:
用一个图进行纹理贴图,另一张图用于纹理采样进行镜面光照计算
main.cpp
#include Camera.h
//Camera.h
#pragma once
// Std. Includes
#include Shader.h
//Shader.h
#pragma once
#ifndef TEXTURE_SHADER_H_
#define TEXTURE_SHADER_H_
#include Shader部分
obj.vs
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec3 Normal;
out vec3 FragPos;
out vec2 TexCoords;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
FragPos = vec3(model * vec4(position, 1.0f));
Normal = mat3(transpose(inverse(model))) * normal;
TexCoords = texCoords;
} obj.frag
#version 330 core
struct Material {
sampler2D diffuse;
sampler2D specular;
float shininess;
};
struct Light {
vec3 position;
vec3 ambient;
vec3 diffuse;
vec3 specular;
};
in vec3 FragPos;
in vec3 Normal;
in vec2 TexCoords;
out vec4 color;
uniform vec3 viewPos;
uniform Material material;
uniform Light light;
void main()
{
// Ambient
vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
// Diffuse
vec3 norm = normalize(Normal);
vec3 lightDir = normalize(light.position - FragPos);
float diff = max(dot(norm, lightDir), 0.0);
vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));
// Specular
vec3 viewDir = normalize(viewPos - FragPos);
vec3 reflectDir = reflect(-lightDir, norm);
float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));
color = vec4(ambient + diffuse + specular, 1.0f);
} lamp.vs
#version 330 core
layout (location = 0) in vec3 position;
uniform mat4 model;
uniform mat4 projection;
void main()
{
gl_Position = projection * model * vec4(position, 1.0f);
} lamp.frag
#version 330 core
out vec4 color;
void main()
{
color = vec4(1.0f, 1.0f, 1.0f, 1.0f);
} 源码: VS2015
http://download.csdn.net/detail/yulinxx/9851467