opengl卡通渲染之逐顶点渲染与逐像素渲染

来源：互联网发布：软件开发电脑配置编辑：程序博客网时间：2024/05/17 07:38

逐顶点渲染效果：

逐像素渲染效果

逐顶点渲染顶点shader

attribute vec3 pos;attribute vec2 texcoord;attribute vec3 normal;uniform mat4 M;uniform mat4 P;uniform mat4 V;uniform mat4 NM;uniform vec3 U_LightPos;uniform vec3 U_EyePos;uniform vec4 U_DiffuseLightColor;uniform vec4 U_DiffuseMaterial;uniform vec4 U_SpecularLightColor;uniform vec4 U_SpecularMaterial;varying vec4 V_Color;void main(){//光线方向vec3 L=U_LightPos;L=normalize(L);//法向量转换到世界空间vec3 n=normalize(mat3(NM)*normal);//计算光照强度float intensity=max(0.0,dot(L,n));//根据不同的光照强度，计算出不同的颜色if (intensity > 0.95)          V_Color = vec4(1.0,0.5,0.5,1.0);      else if (intensity > 0.5)          V_Color = vec4(0.6,0.3,0.3,1.0);      else if (intensity > 0.25)          V_Color = vec4(0.4,0.2,0.2,1.0);      else          V_Color = vec4(0.2,0.1,0.1,1.0);  gl_Position=P*V*M*vec4(pos,1.0);}

片元shader

uniform vec4 U_AmbientLightColor;uniform vec4 U_AmbientMaterial;varying vec4 V_Color;void main(){vec4 ambientColor=U_AmbientLightColor*U_AmbientMaterial;gl_FragColor=ambientColor+V_Color;}

逐像素渲染顶点shader

attribute vec3 pos;attribute vec2 texcoord;attribute vec3 normal;uniform mat4 M;uniform mat4 P;uniform mat4 V;uniform mat4 NM;varying vec3 V_Normal;varying vec3 V_WorldPos;void main(){V_Normal=mat3(NM)*normal;vec4 worldPos=M*vec4(pos,1.0);V_WorldPos=worldPos.xyz;gl_Position=P*V*worldPos;}

片元shader

uniform vec3 U_LightPos;uniform vec3 U_EyePos;uniform vec4 U_AmbientLightColor;uniform vec4 U_AmbientMaterial;uniform vec4 U_DiffuseLightColor;uniform vec4 U_DiffuseMaterial;uniform vec4 U_SpecularLightColor;uniform vec4 U_SpecularMaterial;varying vec3 V_Normal;varying vec3 V_WorldPos;void main(){//计算环境光vec4 ambientColor=U_AmbientLightColor*U_AmbientMaterial;//光线方向vec3 L=U_LightPos;L=normalize(L);//法向量转换到世界空间vec3 n=normalize(V_Normal);//根据不同的光照强度给出不同颜色值float diffuseIntensity=max(0.0,dot(L,n));vec4 diffuseColor;    if (diffuseIntensity > 0.95)          diffuseColor = vec4(1.0,0.5,0.5,1.0);      else if (diffuseIntensity > 0.5)          diffuseColor = vec4(0.6,0.3,0.3,1.0);      else if (diffuseIntensity > 0.25)          diffuseColor = vec4(0.4,0.2,0.2,1.0);      else          diffuseColor = vec4(0.2,0.1,0.1,1.0);  gl_FragColor=ambientColor+diffuseColor;}

阅读全文

0 0