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我正在嘗試爲使用GLES20的android應用程序編寫自己的着色器類和矩陣處理類。但是，現在我只能獲取背景顏色。編寫自定義OpenGL ES 2.0着色器/ MatrixHandler，變得空白屏幕
我一直拉着我的頭髮這幾天。我想比較我的類和GL10之間的矩陣操作，以確保它們吐出相同的結果，但是我不能在我的生活中使用api示例MatrixGrabber和MatrixTrackingGL來吐出除了單位矩陣之外的任何東西（儘管渲染正確）。
所以我打算髮布一些代碼，請讓我知道你是否看到任何可能成爲這兩個類的問題！
這裏是我MatrixHandler類：
import java.util.Stack;
import android.opengl.Matrix;
public class MatrixHandler
{
public static float[] mMVPMatrix = new float[16];
public static float[] mProjMatrix = new float[16];
public static float[] mViewMatrix = new float[16];
public static float[] mRotationMatrix = new float[16];
public static Stack<float[]> mvpStack = new Stack<float[]>();
public static Stack<float[]> projStack = new Stack<float[]>();
public static Stack<float[]> viewStack = new Stack<float[]>();
public static Stack<float[]> rotationStack = new Stack<float[]>();
public static void setViewIdentity()
{
Matrix.setIdentityM(mViewMatrix, 0);
}
public static void setProjIdentity()
{
Matrix.setIdentityM(mProjMatrix, 0);
}
public static void setViewport(float left, float right, float bottom, float top, float near, float far)
{
Matrix.frustumM(mProjMatrix, 0,
left, right,
bottom, top,
near, far
);
}
public static void setLookAt(
float eyeX, float eyeY, float eyeZ,
float posX, float posY, float posZ,
float upX, float upY, float upZ
)
{
Matrix.setLookAtM(
mViewMatrix, 0,
eyeX, eyeY, eyeZ,
posX, posY, posZ,
upX, upY, upZ
);
//Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mViewMatrix, 0);
}
public static void translate(float x, float y, float z)
{
Matrix.translateM(mViewMatrix, 0,
x, y, z
);
Matrix.multiplyMM(mMVPMatrix, 0, mViewMatrix, 0, mMVPMatrix, 0);
}
public static void rotate(float a, float x, float y, float z)
{
Matrix.rotateM(mRotationMatrix, 0,
a, x, y, z
);
Matrix.multiplyMM(mMVPMatrix, 0, mRotationMatrix, 0, mMVPMatrix, 0);
}
public static void pushMatrix()
{
mvpStack.push(mMVPMatrix);
projStack.push(mProjMatrix);
viewStack.push(mViewMatrix);
rotationStack.push(mRotationMatrix);
}
public static void popMatrix()
{
mMVPMatrix = mvpStack.pop();
mProjMatrix = projStack.pop();
mViewMatrix = viewStack.pop();
mRotationMatrix = rotationStack.pop();
}
public static void printMatrix(String label, float[] m)
{
System.err.print(label + " : {");
for(float i : m)
{
System.err.print(i + ", ");
}
System.err.println("}");
}
}
這裏是我的Shader類：
import java.nio.FloatBuffer;
import com.bradsproject.appName.MatrixHandler;
import android.opengl.GLES20;
public class Shader
{
private static int mProgram;
static int maPositionHandle;
static int maColorHandle;
static int maTextureHandle;
static int muMVPMatrixHandle;
static int maTexture;
private final static String mVertexShader =
"uniform mat4 uMVPMatrix;" +
"attribute vec3 aPosition;" +
"attribute vec2 aTextureCoord;" +
"attribute vec4 aColor;" +
"varying vec4 vColor;" +
"varying vec2 vTextureCoord;" +
"void main() {" +
" gl_Position = uMVPMatrix * vec4(aPosition, 1.0);" +
" vTextureCoord = aTextureCoord;" +
" vColor = aColor;" +
"}";
private final static String mFragmentShader =
"precision mediump float;" +
"varying vec2 vTextureCoord;" +
"uniform sampler2D sTexture;" +
"varying vec4 vColor;" +
"void main() {" +
" gl_FragColor = texture2D(sTexture, vTextureCoord);" +
"}";
public static void init()
{
mProgram = createProgram(mVertexShader, mFragmentShader);
if (mProgram == 0)
return;
maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
maColorHandle = GLES20.glGetAttribLocation(mProgram, "aColor");
maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
maTexture = GLES20.glGetUniformLocation(mProgram, "sTexture");
muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
}
public static void drawArrays(FloatBuffer mPosition, FloatBuffer mColor, FloatBuffer mTexture, int textureId, int mode)
{
GLES20.glUseProgram(mProgram);
mPosition.position(0);
GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 3 * 4, mPosition);
GLES20.glEnableVertexAttribArray(maPositionHandle);
mColor.position(0);
GLES20.glVertexAttribPointer(maColorHandle, 4, GLES20.GL_FLOAT, false, 4 * 4, mColor);
GLES20.glEnableVertexAttribArray(maColorHandle);
mTexture.position(0);
GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false, 2 * 4, mTexture);
GLES20.glEnableVertexAttribArray(maTextureHandle);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLES20.glUniform1i(maTexture, 0);
GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixHandler.mMVPMatrix, 0);
GLES20.glDrawArrays(mode, 0, mPosition.capacity()/3);
}
private static int createProgram(String vertexSource, String fragmentSource)
{
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
if (vertexShader == 0)
{
System.err.println("Failed to load vertex shader.");
return 0;
}
int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
if (pixelShader == 0)
{
System.err.println("Failed to load fragment shader.");
return 0;
}
int program = GLES20.glCreateProgram();
if (program != 0)
{
GLES20.glAttachShader(program, vertexShader);
checkGlError("glAttachShader");
GLES20.glAttachShader(program, pixelShader);
checkGlError("glAttachShader");
GLES20.glLinkProgram(program);
int[] linkStatus = new int[1];
GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
if (linkStatus[0] != GLES20.GL_TRUE)
{
GLES20.glDeleteProgram(program);
program = 0;
}
}
return program;
}
private static int loadShader(int shaderType, String source)
{
int shader = GLES20.glCreateShader(shaderType);
if (shader != 0)
{
GLES20.glShaderSource(shader, source);
GLES20.glCompileShader(shader);
int[] compiled = new int[1];
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0)
{
GLES20.glDeleteShader(shader);
shader = 0;
}
}
return shader;
}
private static void checkGlError(String op)
{
int error;
while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR)
{
throw new RuntimeException(op + ": glError " + error);
}
}
}
我居然發現了一些錯誤。我會稍後嘗試發佈新的源代碼。 – Brad 2012-08-07 05:46:14