OpenGL ES 2紋理渲染黑色

Question

我正在努力在由2個三角形組成的四邊形上渲染2D紋理。然而，即使我將紋理和紋理座標傳遞給着色器，它仍呈現爲黑色。任何幫助是極大的讚賞！

渲染功能：

public void render(float[] mvpMatrix) { 
    // Add program to OpenGL environment. 
    GLES20.glUseProgram(mGLProgram); 

    // Get handle to vertex shader's aPosition member 
    // and enable a handle to the triangle vertices. 
    int mPositionHandle = GLES20.glGetAttribLocation(mGLProgram, "aPosition"); 
    GLES20.glEnableVertexAttribArray(mPositionHandle); 

    // Prepare the vertex coordinate data. 
    GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX, 
      GLES20.GL_FLOAT, false, vertexStride, vertexBuffer 
    ); 

    // Pass the texture coordinates. 
    int mTextureCoordinateHandle = GLES20.glGetAttribLocation(mGLProgram, "aTexCoordinate"); 
    GLES20.glEnableVertexAttribArray(mTextureCoordinateHandle); 

    // Prepare the uv coordinate data. 
    GLES20.glVertexAttribPointer(mTextureCoordinateHandle, UV_SIZE, 
      GLES20.GL_FLOAT, false, 0, uvBuffer 
    ); 

    // Get handle to fragment shader's aColor member and set color for drawing the triangle. 
    int mColorHandle = GLES20.glGetUniformLocation(mGLProgram, "uColor"); 
    GLES20.glUniform4fv(mColorHandle, 1, color, 0); 

    // Tell the texture uniform sampler to use this texture 
    // in the shader by binding to texture unit 0. 
    int mTextureUniformHandle = GLES20.glGetUniformLocation(mGLProgram, "uTexture"); 
    GLES20.glUniform1i(mTextureUniformHandle, 0); 

    // Get handle to shape's transformation matrix. 
    int mMVPMatrixHandle = GLES20.glGetUniformLocation(mGLProgram, "uMVPMatrix"); 
    GLError.checkGlError("glGetUniformLocation"); 

    // Apply the projection and view transformation. 
    GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0); 
    GLError.checkGlError("glUniformMatrix4fv"); 

    // Set the active texture unit to texture unit 0. 
    GLES20.glActiveTexture(GLES20.GL_TEXTURE0); 

    // Bind the texture to this unit. 
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture); 

    // Render the sprite. 
    GLES20.glDrawElements(
      GLES20.GL_TRIANGLES, indices.length, 
      GLES20.GL_UNSIGNED_SHORT, indiceBuffer 
    ); 

    // Disable vertex array. 
    GLES20.glDisableVertexAttribArray(mPositionHandle); 
    GLES20.glDisableVertexAttribArray(mTextureCoordinateHandle); 
} 

的UV和指標：

private float uvs[] = { 
     0.0f, 1.0f, 
     1.0f, 1.0f, 
     0.0f, 0.0f, 
     1.0f, 0.0f 
}; 

private short indices[] = { 
     0, 1, 2, 0, 2, 3 
}; 

創建UV字節的緩衝區：

// Initialize byte buffer for the uvs. 
ByteBuffer ub = ByteBuffer.allocateDirect(
     // Number of uv values * 4 bytes per float. 
     uvs.length * 4 
); 

ub.order(ByteOrder.nativeOrder()); 
uvBuffer = ub.asFloatBuffer(); 
uvBuffer.put(uvs); 
uvBuffer.position(0); 

紋理裝載機：

public static int loadTexture(Context context, final int id, final int resource) { 
    final int[] texture = new int[1]; 

    GLES20.glGenTextures(id, texture, 0); 

    if (texture[0] == 0) { 
     throw new RuntimeException("Error loading texture bro. " + texture[0]); 
    } 

    final BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inScaled = false; 

    // Decode the bitmap automagically. 
    final Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resource, options); 

    // Bind the texture as texture 2d. 
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture[0]); 

    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST); 
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST); 

    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0); 

    bitmap.recycle(); 

    return texture[0]; 
} 

頂點着色器：

uniform mat4 uMVPMatrix; 

attribute vec2 aTexCoordinate; 
attribute vec4 aPosition; 

varying vec2 vTexCoordinate; 

void main() { 
    // Pass the texture coordinate. 
    vTexCoordinate = aTexCoordinate; 

    // Determine the position of the render. 
    gl_Position = uMVPMatrix * aPosition; 
} 

片段着色器：

precision mediump float; 

uniform sampler2D uTexture; 
uniform vec4 uColor; 

varying vec2 vTexCoordinate; 

void main() { 
    gl_FragColor = texture2D(uTexture, vTexCoordinate); 
} 

Answer 1

哎呦我的錯！由於某種原因，UV_COORD常數爲1而不是2。好方法花4個小時！