我正在尝试使用OpenGL ES 3.0实现一个基本的着色程序，并从各种教程中拼凑出了这段代码。在我的眼里，一切都看起来正确，并且编译也没有问题，但是屏幕上却什么也没有显示。
在添加了法线和光源位置数据之前，它还可以正常渲染，但在添加后就会出问题，而我也找不到解决办法。
有人能看出问题在哪里吗？
import android.opengl.GLES30.*
import android.opengl.GLSurfaceView.Renderer
import android.opengl.Matrix.*
import java.nio.*
import java.nio.ByteBuffer.allocateDirect
import java.nio.ByteOrder.nativeOrder
import javax.microedition.khronos.egl.EGLConfig
import javax.microedition.khronos.opengles.GL10
class GLRenderer:Renderer{
lateinit var vBuf: FloatBuffer
lateinit var nBuf: FloatBuffer
var glProgram = -1
var uMV = -1
var uMVP = -1
var uLightPos = -1
val aPosition = 0
val aNormal = 1
val aColor = 2
val modelM = FloatArray(16)
val viewM = FloatArray(16)
val projM = FloatArray(16)
val mvM = FloatArray(16)
val mvpM = FloatArray(16)
val lPos = FloatArray(4)
val lightPos = floatArrayOf(0f,10f,0f,1f)
override fun onSurfaceCreated(g:GL10,c:EGLConfig) {
glClearColor(0f,0f,0f,1f)
setLookAtM(viewM,0,0f,0f,5f,0f,0f,0f,0f,1f,0f)
val vShader = glCreateShader(GL_VERTEX_SHADER)
val fShader = glCreateShader(GL_FRAGMENT_SHADER)
glShaderSource(vShader,"#version 300 es\n" +
" uniform mat4 u_mvpM; " +
" uniform mat4 u_mvM; " +
" layout(location=0) in vec4 aPos; " +
" layout(location=1) in vec4 aCol; " +
" layout(location=2) in vec3 aNorm; " +
" out vec3 vPos; " +
" out vec4 vCol; " +
" out vec3 vNorm; " +
" void main(){ " +
" vPos = vec3(u_mvM * aPos); " +
" vCol = aCol; " +
" vNorm = vec3(u_mvM * vec4(aNorm,0.0)); " +
" gl_Position = u_mvpM * aPos;} " )
glShaderSource(fShader,"#version 300 es\n" +
" precision mediump float; " +
" uniform vec3 u_LightPos; " +
" in vec3 vPos; " +
" in vec4 vCol; " +
" in vec3 vNorm; " +
" out vec4 fColor; " +
" void main(){ " +
" float distance = length(u_LightPos - vPos); " +
" vec3 lightPos = normalize(u_LightPos - vPos); " +
" float diffuse = max(dot(vNorm,lightPos),0.1)/ " +
" (distance*distance/4.0 + 1.0); " +
" fColor = vCol * diffuse;} " )
glCompileShader(vShader)
glCompileShader(fShader)
glProgram = glCreateProgram()
glAttachShader(glProgram,vShader)
glAttachShader(glProgram,fShader)
glLinkProgram(glProgram)
glUseProgram(glProgram)
uMV = glGetUniformLocation(glProgram,"u_mvM")
uMVP = glGetUniformLocation(glProgram,"u_mvpM")
uLightPos = glGetUniformLocation(glProgram,"u_LightPos")
vBuf = allocateDirect(9*4).order(nativeOrder()).asFloatBuffer().put(floatArrayOf(
0f,1f,0f, -1f,0f,0f, 1f,0f,0f))
nBuf = allocateDirect(9*4).order(nativeOrder()).asFloatBuffer().put(floatArrayOf(
0f,0f,-1f, 0f,0f,-1f, 0f,0f,-1f))
vBuf.position(0)
nBuf.position(0)
}
override fun onSurfaceChanged(g:GL10,w:Int,h:Int) {
glViewport(0,0,w,h)
val ratio = (w/h).toFloat()
frustumM(projM,0,-ratio,ratio,1f,-1f,1f,10f)
}
override fun onDrawFrame(g:GL10){
glClear(GL_COLOR_BUFFER_BIT)
setIdentityM(modelM,0)
multiplyMM(mvM, 0,viewM,0,modelM,0)
multiplyMM(mvpM,0,projM,0,mvM,0)
multiplyMV(lPos,0,mvpM,0,lightPos,0)
glUniformMatrix4fv(uMV, 1,false,mvM, 0)
glUniformMatrix4fv(uMVP,1,false,mvpM,0)
glUniform3f(uLightPos,lPos[0],lPos[1],lPos[2])
glVertexAttribPointer(aPosition,3,GL_FLOAT,false,0,vBuf)
glVertexAttribPointer(aNormal, 3,GL_FLOAT,false,0,nBuf)
glVertexAttrib4f(aColor,1f,1f,1f,1f)
glEnableVertexAttribArray(aPosition)
glEnableVertexAttribArray(aNormal)
glDrawArrays(GL_TRIANGLES,0,vBuf.capacity()/4)
}
}
fColor = vCol * diffuse + 0.5;，你能看到任何东西吗？ - Rabbid76