核心shader实现
const char* vs = { "attribute vec3 inVertex;" "attribute vec3 inNormal;"//法线 "uniform mat4 MVPMatrix;" "uniform vec3 LightDirection;"//光的方向 "uniform vec3 EyePosition;" "varying vec2 TexCoord;" "void main()" "{" "gl_Position=MVPMatrix*vec4(inVertex,1.0);" "vec3 eyeDirection=normalize(EyePosition-inVertex);" "TexCoord.x=dot(LightDirection,inNormal);"//dot(x, y): 点积，各分量分别相乘 后 相加 "TexCoord.y=dot(eyeDirection,inNormal);" "}" }; const char* ps = { "precision lowp float;" "uniform sampler2D sTexture;" "varying vec2 TexCoord;" "const vec3 cBaseColor=vec3(1,1,1);" "void main()" "{" "gl_FragColor=vec4(cBaseColor*texture2D(sTexture, TexCoord).rgb,1.0);" "}" };渲染函数 virtual void onRender(Program_CELL& shader,CELL3RDCamera& camera) { static float angle = 0; matrix4 matRot(1); matRot.rotateY(angle); matrix4 matTrans; matTrans.translate(0,5,0); matrix4 matScale(1); matScale.scale(0.3f,0.3f,0.3f); //总的模型变换矩阵 matrix4 matModel = matTrans*matRot*matScale; angle += 1.0f; //观察点坐标 也就是眼睛的位置 float4 vMsEyePos = float4(0, 0, 125, 1)*matModel; _device.setUniform3fv(shader.EyePosition,1,&vMsEyePos.x); //从世界空间转换方向光到模型空间 float4 vMsLightDir = float4(1, 2, 1, 0)*matModel;//光的入射方向 //归一化 float3 vMsLightDirS = normalize(float3(vMsLightDir.x,vMsLightDir.y,vMsLightDir.z)); _device.setUniform3fv(shader.LightDirection,1,&vMsLightDirS.x); //光源位置 float4 vMsLightPos = float4(50,20,40,1); vMsLightPos = vMsLightPos*matModel; matrix4 MVP = camera._matProj*camera._matView*matModel; _device.setUniformMatrix4fv(shader.MVPMatrix,1,false,MVP.data()); VertexBumpMap* vert = &_arVertexs.front(); _device.attributePointer(shader.inVertex,3,GL_FLOAT,GL_FALSE,sizeof(VertexBumpMap),vert); _device.attributePointer(shader.inNormal, 3, GL_FLOAT, GL_FALSE, sizeof(VertexBumpMap), &vert[0]._normal); _device.drawElements(GL_TRIANGLES,_arFaces.size()*3,GL_UNSIGNED_SHORT,&_arFaces.front()); }