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GlFilter.java
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GlFilter.java
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package com.daasuu.mp4compose.filter;
import android.content.res.Resources;
import android.opengl.GLES20;
import com.daasuu.mp4compose.gl.GlFramebufferObject;
import com.daasuu.mp4compose.utils.EglUtil;
import java.util.HashMap;
import static android.opengl.GLES20.GL_FLOAT;
/**
* Created by sudamasayuki on 2017/11/14.
*/
public class GlFilter {
public static final String DEFAULT_UNIFORM_SAMPLER = "sTexture";
protected static final String DEFAULT_VERTEX_SHADER =
"attribute highp vec4 aPosition;\n" +
"attribute highp vec4 aTextureCoord;\n" +
"varying highp vec2 vTextureCoord;\n" +
"void main() {\n" +
"gl_Position = aPosition;\n" +
"vTextureCoord = aTextureCoord.xy;\n" +
"}\n";
protected static final String DEFAULT_FRAGMENT_SHADER =
"precision mediump float;\n" +
"varying highp vec2 vTextureCoord;\n" +
"uniform lowp sampler2D sTexture;\n" +
"void main() {\n" +
"gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
"}\n";
private static final float[] VERTICES_DATA = new float[]{
// X, Y, Z, U, V
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f
};
private static final int FLOAT_SIZE_BYTES = 4;
protected static final int VERTICES_DATA_POS_SIZE = 3;
protected static final int VERTICES_DATA_UV_SIZE = 2;
protected static final int VERTICES_DATA_STRIDE_BYTES = (VERTICES_DATA_POS_SIZE + VERTICES_DATA_UV_SIZE) * FLOAT_SIZE_BYTES;
protected static final int VERTICES_DATA_POS_OFFSET = 0 * FLOAT_SIZE_BYTES;
protected static final int VERTICES_DATA_UV_OFFSET = VERTICES_DATA_POS_OFFSET + VERTICES_DATA_POS_SIZE * FLOAT_SIZE_BYTES;
private final String vertexShaderSource;
private String fragmentShaderSource;
private int program;
private int vertexShader;
private int fragmentShader;
private int vertexBufferName;
private final HashMap<String, Integer> handleMap = new HashMap<>();
public GlFilter() {
this(DEFAULT_VERTEX_SHADER, DEFAULT_FRAGMENT_SHADER);
}
public GlFilter(final Resources res, final int vertexShaderSourceResId, final int fragmentShaderSourceResId) {
this(res.getString(vertexShaderSourceResId), res.getString(fragmentShaderSourceResId));
}
public GlFilter(final String vertexShaderSource, final String fragmentShaderSource) {
this.vertexShaderSource = vertexShaderSource;
this.fragmentShaderSource = fragmentShaderSource;
}
public void setup() {
release();
vertexShader = EglUtil.loadShader(vertexShaderSource, GLES20.GL_VERTEX_SHADER);
fragmentShader = EglUtil.loadShader(fragmentShaderSource, GLES20.GL_FRAGMENT_SHADER);
program = EglUtil.createProgram(vertexShader, fragmentShader);
vertexBufferName = EglUtil.createBuffer(VERTICES_DATA);
getHandle("aPosition");
getHandle("aTextureCoord");
getHandle("sTexture");
}
public void setFragmentShaderSource(String fragmentShaderSource) {
this.fragmentShaderSource = fragmentShaderSource;
}
public void setFrameSize(final int width, final int height) {
// do nothing
}
public void release() {
GLES20.glDeleteProgram(program);
program = 0;
GLES20.glDeleteShader(vertexShader);
vertexShader = 0;
GLES20.glDeleteShader(fragmentShader);
fragmentShader = 0;
GLES20.glDeleteBuffers(1, new int[]{vertexBufferName}, 0);
vertexBufferName = 0;
handleMap.clear();
}
//
public void draw(final int texName, final GlFramebufferObject fbo) {
useProgram();
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vertexBufferName);
GLES20.glEnableVertexAttribArray(getHandle("aPosition"));
GLES20.glVertexAttribPointer(getHandle("aPosition"), VERTICES_DATA_POS_SIZE, GL_FLOAT, false, VERTICES_DATA_STRIDE_BYTES, VERTICES_DATA_POS_OFFSET);
GLES20.glEnableVertexAttribArray(getHandle("aTextureCoord"));
GLES20.glVertexAttribPointer(getHandle("aTextureCoord"), VERTICES_DATA_UV_SIZE, GL_FLOAT, false, VERTICES_DATA_STRIDE_BYTES, VERTICES_DATA_UV_OFFSET);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texName);
GLES20.glUniform1i(getHandle("sTexture"), 0);
onDraw();
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
GLES20.glDisableVertexAttribArray(getHandle("aPosition"));
GLES20.glDisableVertexAttribArray(getHandle("aTextureCoord"));
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
}
protected void onDraw() {
}
protected final void useProgram() {
GLES20.glUseProgram(program);
}
protected final int getVertexBufferName() {
return vertexBufferName;
}
protected final int getHandle(final String name) {
final Integer value = handleMap.get(name);
if (value != null) {
return value;
}
int location = GLES20.glGetAttribLocation(program, name);
if (location == -1) {
location = GLES20.glGetUniformLocation(program, name);
}
if (location == -1) {
throw new IllegalStateException("Could not get attrib or uniform location for " + name);
}
handleMap.put(name, location);
return location;
}
private float[] clearColor = new float[]{0f, 0f, 0f, 1f};
public float[] getClearColor() {
return clearColor;
}
public void setClearColor(float red,
float green,
float blue,
float alpha) {
this.clearColor = new float[]{red, green, blue, alpha};
}
}