我正在努力实现多次轮换。当我执行180度旋转时，代码工作正常，但是当角度值小于该值时，它执行平移或缩放，但不执行旋转。 请在此处提出错误或其他任何替代方法。
public class myRenderer implements Renderer {
private int TexProgram;
private int TexAPosLoc;
private int TexAColorLoc;
private int TexACoordLoc;
private int UMVPLocation;
private int USamplerLocation;
private FloatBuffer VertexFB;
private FloatBuffer ColorFB;
private FloatBuffer TexFB;
private float[] TexMatrix = new float[16];
private float[] TexViewMatrix = new float[16];
private float[] TexProjectionMatrix = new float[16];
private float[] TexMVPMatrix = new float[16];
private int textureId;
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glViewport(0, 0, width, height);
initPlane();
float zNear = 0.1f;
float zFar = 10;
Matrix.setLookAtM(TexViewMatrix, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0);
// Matrix.setLookAtM(rm, rmOffset, eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ)
Matrix.frustumM(TexProjectionMatrix, 0, -0.1f, 0.1f, -0.1f, 0.1f, zNear, zFar);
TexProgram = loadProgram(_planeVertexShaderCode, _planeFragmentShaderCode);
TexAPosLoc = GLES20.glGetAttribLocation(TexProgram, "aPosition");
TexAColorLoc = GLES20.glGetAttribLocation(TexProgram, "aColor");
TexACoordLoc = GLES20.glGetAttribLocation(TexProgram, "aCoord");
UMVPLocation = GLES20.glGetUniformLocation(TexProgram, "uMVP");
USamplerLocation = GLES20.glGetUniformLocation(TexProgram, "uSampler");
int[] textures = new int[1];
GLES20.glGenTextures(1, textures, 0);
textureId = textures[0];
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLES20.glPixelStorei(GLES20.GL_UNPACK_ALIGNMENT, 1);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST); // GL_LINEAR
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
}
public void onDrawFrame(GL10 gl) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
Matrix.setIdentityM(TexMatrix, 0);
for(int i =0; i<2;i++)
{
Matrix.multiplyMM(TexMVPMatrix, 0, TexViewMatrix, 0, TexMatrix, 0);
Matrix.multiplyMM(TexMVPMatrix, 0, TexProjectionMatrix, 0, TexMVPMatrix, 0);
GLES20.glUseProgram(TexProgram);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLES20.glUniform1i(USamplerLocation, 0);
GLES20.glUniformMatrix4fv(UMVPLocation, 1, false, TexMVPMatrix, 0);
GLES20.glVertexAttribPointer(TexAPosLoc, 3, GLES20.GL_FLOAT, false, 12, VertexFB);
GLES20.glEnableVertexAttribArray(TexAPosLoc);
GLES20.glVertexAttribPointer(TexAColorLoc, 4, GLES20.GL_FLOAT, false, 16, ColorFB);
GLES20.glEnableVertexAttribArray(TexAColorLoc);
GLES20.glVertexAttribPointer(TexACoordLoc, 2, GLES20.GL_FLOAT, false, 8, TexFB);
GLES20.glEnableVertexAttribArray(TexACoordLoc);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 3);
Matrix.setIdentityM(TexMatrix, 0);
// Matrix.translateM(TexMatrix,0,0,1,0);
Matrix.rotateM(TexMatrix,0,180.0f,1,0,0);
// Matrix.rotateM(TexMatrix,0,90.0f,1,0,0);
}
// System.gc();
}
private void initPlane() {
float[] planeVFA = {
0.0f, 0.866f, 0.0f, // top
-0.5f, 0f, 0.0f, // bottom left
0.5f, 0f, 0.0f // bottom right
};
float[] planeTFA = {
1,1, 0,1, 1,0, 0,0
};
float[] planeCFA = {
1,0,1,1,
1,1,0,1,
0,1,1,1
};
ByteBuffer planeVBB = ByteBuffer.allocateDirect(planeVFA.length * 4);
planeVBB.order(ByteOrder.nativeOrder());
VertexFB = planeVBB.asFloatBuffer();
VertexFB.put(planeVFA);
VertexFB.position(0);
ByteBuffer planeTBB = ByteBuffer.allocateDirect(planeTFA.length * 4);
planeTBB.order(ByteOrder.nativeOrder());
TexFB = planeTBB.asFloatBuffer();
TexFB.put(planeTFA);
TexFB.position(0);
ByteBuffer planeCBB = ByteBuffer.allocateDirect(planeCFA.length * 4);
planeCBB.order(ByteOrder.nativeOrder());
ColorFB= planeCBB.asFloatBuffer();
ColorFB.put(planeCFA);
ColorFB.position(0);
} // initPlane() ends
private int loadShader(int type, String source) {
int shader = GLES20.glCreateShader(type);
GLES20.glShaderSource(shader, source);
GLES20.glCompileShader(shader);
return shader;
} // loadShader() ends
private int loadProgram(String vertexShaderCode, String fragmentShaderCode) {
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
int program = GLES20.glCreateProgram();
GLES20.glAttachShader(program, vertexShader);
GLES20.glAttachShader(program, fragmentShader);
GLES20.glLinkProgram(program);
return program;
} // loadProgram() ends
private final String _planeVertexShaderCode =
"attribute vec4 aPosition; \n"
+ "attribute vec2 aCoord; \n"
+ "attribute vec4 aColor; \n"
+ "varying vec2 vCoord; \n"
+ "varying vec4 vColor; \n"
+ "uniform mat4 uMVP; \n"
+ "void main() { \n"
+ " gl_Position = uMVP * aPosition; \n"
+ " vCoord = aCoord; \n"
+ " vColor = aColor; \n"
+ "} \n";
private final String _planeFragmentShaderCode =
"#ifdef GL_FRAGMENT_PRECISION_HIGH \n"
+ "precision highp float; \n"
+ "#else \n"
+ "precision mediump float; \n"
+ "#endif \n"
+ "varying vec2 vCoord; \n"
+ "varying vec4 vColor; \n"
+ "uniform sampler2D uSampler; \n"
+ "void main() { \n"
+ " vec4 textureColor; \n"
+ " textureColor = texture2D(uSampler,vCoord); \n"
+ " gl_FragColor = vColor + textureColor; \n"
+ "} \n";
} // myRenderer() ends
此外，请建议我如何改进或优化代码。 纹理和采样器的使用是有意的。