OpenGL render Texture - Android android.opengl

Android examples for android.opengl:OpenGL Texture

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Description

OpenGL render Texture

Demo Code

/*//from  w  w  w  .  java  2 s.c  om
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import android.graphics.Bitmap;
import android.opengl.GLES20;
import android.opengl.GLUtils;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

public class Main{
    public static void renderTexture(RenderContext context, int texture,
            int viewWidth, int viewHeight) {
        // Use our shader program
        GLES20.glUseProgram(context.shaderProgram);
        checkGlError("glUseProgram");

        // Set viewport
        GLES20.glViewport(0, 0, viewWidth, viewHeight);
        checkGlError("glViewport");

        // Disable blending
        GLES20.glDisable(GLES20.GL_BLEND);

        // Set the vertex attributes
        GLES20.glVertexAttribPointer(context.texCoordHandle, 2,
                GLES20.GL_FLOAT, false, 0, context.texVertices);
        GLES20.glEnableVertexAttribArray(context.texCoordHandle);
        GLES20.glVertexAttribPointer(context.posCoordHandle, 2,
                GLES20.GL_FLOAT, false, 0, context.posVertices);
        GLES20.glEnableVertexAttribArray(context.posCoordHandle);
        checkGlError("vertex attribute setup");

        // Set the input texture
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        checkGlError("glActiveTexture");
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture);
        checkGlError("glBindTexture");
        GLES20.glUniform1i(context.texSamplerHandle, 0);

        // Draw!
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
    }
    private static void checkGlError(String op) {
        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
            throw new RuntimeException(op + ": glError " + error);
        }
    }
}

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