Android OpenGL ES 2.0黑色纹理
我在Android上学习gles2.0（我是一个新手:)，我想绘制一个纹理方块，但是我不能。 我GOOGLE了很多，但我无法弄清楚答案，我只得到一个黑色的方块。
我建立了一个GLSurfaceView，然后是一个渲染器：
public class MySurfaceRenderer implements GLSurfaceView.Renderer {
private Context context;
private Sprite sprite1;
@Override
public void onDrawFrame(GL10 gl) {
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
sprite1.Draw();
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
GLES20.glViewport(0, 0, width, height);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA,GLES20.GL_ONE_MINUS_SRC_ALPHA);
GLES20.glClearColor(0.0f, 0.3f, 0.0f, 1.0f);
sprite1 = new Sprite(context, R.drawable.test);
}
}
雪碧类：
public class Sprite {
private static String TAG = "SpriteRender";
private Context context;
private FloatBuffer databuffer;
private FloatBuffer texturebuffer;
// x, y,
float data[] = {-0.5f, -0.5f,
-0.5f, 0.5f,
0.5f, 0.5f,
0.5f, -0.5f};
// u,v
float texturedata[] = {0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f};
private int mProgram;
private int vertexShader;
private int fragmentShader;
private int texture;
private int positionHandler;
private int texCoordHandler;
private int textureHandler;
public Sprite(Context context, int textureid){
this.context = context;
ByteBuffer bb_data = ByteBuffer.allocateDirect(data.length * 4);
bb_data.order(ByteOrder.nativeOrder());
ByteBuffer bb_texture = ByteBuffer.allocateDirect(texturedata.length * 4);
bb_texture.order(ByteOrder.nativeOrder());
databuffer = bb_data.asFloatBuffer();
databuffer.put(data);
databuffer.position(0);
texturebuffer = bb_texture.asFloatBuffer();
texturebuffer.put(texturedata);
texturebuffer.position(0);
vertexShader = ShaderLoader.loadShader(GLES20.GL_VERTEX_SHADER, ShaderLoader.readFromAssert(context, R.raw.tvs));
fragmentShader = ShaderLoader.loadShader(GLES20.GL_FRAGMENT_SHADER, ShaderLoader.readFromAssert(context, R.raw.tfs));
mProgram = GLES20.glCreateProgram();
GLES20.glAttachShader(mProgram, fragmentShader);
GLES20.glAttachShader(mProgram, vertexShader);
GLES20.glLinkProgram(mProgram);
int[] linkStatus = new int[1];
GLES20.glGetProgramiv(mProgram, GLES20.GL_LINK_STATUS, linkStatus, 0);
if (linkStatus[0] == 0){
// Displays error message
}
positionHandler = GLES20.glGetAttribLocation(mProgram, "a_Position");
texCoordHandler = GLES20.glGetAttribLocation(mProgram, "a_TexCoordinate");
textureHandler = GLES20.glGetUniformLocation(mProgram, "u_Texture");
texture = TextureLoader.loadTexture(context, textureid);
}
public void Draw(){
GLES20.glUseProgram(mProgram);
databuffer.position(0);
texturebuffer.position(0);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture);
GLES20.glUniform1i(textureHandler, 0);
GLES20.glEnableVertexAttribArray(texCoordHandler);
GLES20.glEnableVertexAttribArray(positionHandler);
GLES20.glVertexAttribPointer(positionHandler, 2, GLES20.GL_FLOAT, false, 8, databuffer);
GLES20.glVertexAttribPointer(texCoordHandler, 2, GLES20.GL_FLOAT, false, 8, texturebuffer);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_FAN, 0, 4);
}
}
ShaderLoader.loadShader从文件加载着色器（在res / raw中），TextureLoader.loadTexture从资源加载纹理：
public static int loadTexture(Context context, int resource){
int[] texture = new int[1];
GLES20.glGenTextures(1, texture, 0);
BitmapFactory.Options bo = new BitmapFactory.Options();
bo.inScaled = false;
Bitmap tex = BitmapFactory.decodeResource(context.getResources(), resource, bo);
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);
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);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, tex, 0);
tex.recycle();
if(texture[0] == 0){
// Displays error
}
return texture[0];
}
顶点着色器：
attribute vec4 a_Position;
attribute vec2 a_TexCoordinate;
varying vec2 v_TexCoordinate;
void main() {
v_TexCoordinate = a_TexCoordinate;
gl_Position = a_Position;
}
片段着色器：
precision mediump float;
varying vec2 v_TexCoordinate;
uniform sampler2D u_Texture;
void main() {
gl_FragColor = texture2D(u_Texture, v_TexCoordinate);
}
我看了一些东西：
感谢帮助！
我已经想出了答案：
当我加载纹理时，我没有正确传递给OpenGL。
我添加了TextureLoader.loadTexture GLES20.glBindTexture（GLES20.GL_TEXTURE_2D，texture [0]）; 如下所示：
...
Bitmap tex = BitmapFactory.decodeResource(context.getResources(), resource, bo);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture[0]);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
...
现在它正在工作。
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