Base canvas usage.
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package com.codigoparallevar.minicards;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.view.View;
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class DrawView extends View {
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Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
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public DrawView(Context context) {
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super(context);
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paint.setColor(Color.RED);
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}
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@Override
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public void onDraw(Canvas canvas){
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canvas.drawLine(0, 0, 20, 20, paint);
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canvas.drawLine(20, 0, 0, 20, paint);
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}
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}
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package com.codigoparallevar.minicards;
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import android.opengl.GLSurfaceView;
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import android.graphics.Color;
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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import com.codigoparallevar.minicards.rendering.MyGLSurfaceView;
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public class TestActivity extends AppCompatActivity {
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private GLSurfaceView mGLView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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// Create a GLSurfaceView instance and set it
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// as the ContentView for this Activity.
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mGLView = new MyGLSurfaceView(this);
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setContentView(mGLView);
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DrawView drawView = new DrawView(this);
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drawView.setBackgroundColor(Color.BLACK);
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setContentView(drawView);
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}
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}
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package com.codigoparallevar.minicards.rendering;
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import android.content.Context;
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import android.opengl.GLSurfaceView;
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public class MyGLSurfaceView extends GLSurfaceView {
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private final MyGlRenderer mRenderer;
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public MyGLSurfaceView(Context context) {
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super(context);
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setEGLContextClientVersion(2);
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mRenderer = new MyGlRenderer();
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setRenderer(mRenderer);
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setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
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}
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}
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package com.codigoparallevar.minicards.rendering;
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import android.opengl.GLES20;
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import android.opengl.GLSurfaceView;
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import android.util.Log;
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import javax.microedition.khronos.egl.EGLConfig;
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import javax.microedition.khronos.opengles.GL10;
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class MyGlRenderer implements GLSurfaceView.Renderer {
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private Triangle mTriangle;
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private Square mSquare;
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@Override
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public void onSurfaceCreated(GL10 gl10, EGLConfig eglConfig) {
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GLES20.glClearColor(0.75f, 0.81f, 1.0f, 1.0f);
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mTriangle = new Triangle();
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mSquare = new Square();
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}
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@Override
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public void onSurfaceChanged(GL10 gl10, int width, int height) {
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GLES20.glViewport(0, 0, width, height);
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}
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@Override
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public void onDrawFrame(GL10 gl10) {
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GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
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mTriangle.draw();
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}
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public static int loadShader(int type, String shaderCode){
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// create a vertex shader type (GLES20.GL_VERTEX_SHADER)
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// or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
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int shader = GLES20.glCreateShader(type);
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// add the source code to the shader and compile it
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GLES20.glShaderSource(shader, shaderCode);
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GLES20.glCompileShader(shader);
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return shader;
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}
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}
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package com.codigoparallevar.minicards.rendering;
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import android.opengl.GLES20;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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import java.nio.ShortBuffer;
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import java.sql.SQLInvalidAuthorizationSpecException;
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public class Square {
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private final String vertexShaderCode =
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"attribute vec4 vPosition;" +
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"void main(){" +
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"gl_Position = vPosition;" +
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"}";
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private final String fragmentShaderCode =
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"precision medium float;" +
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"uniform vec4 vColor;" +
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"void main(){" +
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"gl_FragColor = vColor;" +
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"}";
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private final int mProgram;
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private FloatBuffer vertexBuffer;
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private ShortBuffer drawListBuffer;
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static final int COORDS_PER_VERTEX = 3;
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static float squareCoords[] = {
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-0.5f, 0.5f, 0.0f, // top left
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-0.5f, -0.5f, 0.0f, // bottom left
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0.5f, -0.5f, 0.0f, // bottom right
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0.5f, 0.5f, 0.0f, // top right
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};
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private short drawOrder[] = { 0, 1, 2, 0, 2, 3 }; // order to draw vertices
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public Square(){
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ByteBuffer bb = ByteBuffer.allocateDirect(squareCoords.length * 4);
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bb.order(ByteOrder.nativeOrder());
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vertexBuffer = bb.asFloatBuffer();
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vertexBuffer.put(squareCoords);
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vertexBuffer.position(0);
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ByteBuffer dlb = ByteBuffer.allocateDirect(drawOrder.length * 2);
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dlb.order(ByteOrder.nativeOrder());
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drawListBuffer = dlb.asShortBuffer();
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drawListBuffer.put(drawOrder);
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drawListBuffer.position(0);
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int vertexShader = MyGlRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
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vertexShaderCode);
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int fragmentShader = MyGlRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
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fragmentShaderCode);
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mProgram = GLES20.glCreateProgram();
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GLES20.glAttachShader(mProgram, vertexShader);
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GLES20.glAttachShader(mProgram, fragmentShader);
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GLES20.glLinkProgram(mProgram);
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}
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}
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@ -1,80 +0,0 @@
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package com.codigoparallevar.minicards.rendering;
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import android.opengl.GLES20;
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import android.util.Log;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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public class Triangle {
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private final String vertexShaderCode =
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"attribute vec4 vPosition;" +
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"void main(){" +
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"gl_Position = vPosition;" +
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"}";
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private final String fragmentShaderCode =
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"precision mediump float;" +
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"uniform vec4 vColor;" +
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"void main(){" +
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"gl_FragColor = vColor;" +
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"}";
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private FloatBuffer vertexBuffer;
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private final int mProgram;
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static final int COORDS_PER_VERTEX = 3;
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static float triangleCoords[] = {
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0.0f, 0.622008459f, 0.0f, // top
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-0.5f, -0.311004243f, 0.0f, // bottom left
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0.5f, -0.311004243f, 0.0f // bottom right
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};
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// Set color with red, green, blue and alpha (opacity) values
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float color[] = { 0.63671875f, 0.76953125f, 0.22265625f, 1.0f };
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private int mPositionHandle;
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private int mColorHandle;
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private final int vertexCount = triangleCoords.length / COORDS_PER_VERTEX;
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private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex
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public Triangle(){
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ByteBuffer bb = ByteBuffer.allocateDirect(triangleCoords.length * 4);
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bb.order(ByteOrder.nativeOrder());
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vertexBuffer = bb.asFloatBuffer();
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vertexBuffer.put(triangleCoords);
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vertexBuffer.position(0);
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int vertexShader = MyGlRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
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vertexShaderCode);
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int fragmentShader = MyGlRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
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fragmentShaderCode);
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mProgram = GLES20.glCreateProgram();
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GLES20.glAttachShader(mProgram, vertexShader);
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GLES20.glAttachShader(mProgram, fragmentShader);
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GLES20.glLinkProgram(mProgram);
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}
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public void draw(){
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GLES20.glUseProgram(mProgram);
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mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
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GLES20.glEnableVertexAttribArray(mPositionHandle);
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GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
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GLES20.GL_FLOAT, false,
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vertexStride, vertexBuffer);
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mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");
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GLES20.glUniform4fv(mColorHandle, 1, color, 0);
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Log.d("Triangle", "VB "+ vertexBuffer.get(1));
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GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vertexCount);
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GLES20.glDisableVertexAttribArray(mPositionHandle);
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}
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}
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