GLUtil.java
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package com.sw.laryngoscope.glsurface;
import android.opengl.GLES20;
import java.nio.IntBuffer;
public class GLUtil {
private static final String TAG = "GLUtil";
/**
* 顶点着色器
*/
private static String VERTEX_SHADER =
" attribute vec4 attr_position;\n" +
" attribute vec2 attr_tc;\n" +
" varying vec2 tc;\n" +
" void main() {\n" +
" gl_Position = attr_position;\n" +
" tc = attr_tc;\n" +
" }";
/**
* 片段着色器，正常效果
*/
public static String FRAG_SHADER_NORMAL =
"precision mediump float;\n" +
" varying vec2 tc;\n" +
" uniform sampler2D ySampler;\n" +
" uniform sampler2D uSampler;\n" +
" uniform sampler2D vSampler;\n" +
" const mat3 convertMat = mat3(1.0, 1.0, 1.0, 0, -0.344, 1.77, 1.403, -0.714,0);\n" +
" void main()\n" +
" {\n" +
" vec3 yuv;\n" +
" yuv.x = texture2D(ySampler, tc).r;\n" +
" yuv.y = texture2D(uSampler, tc).r - 0.5;\n" +
" yuv.z = texture2D(vSampler, tc).r - 0.5;\n" +
" gl_FragColor = vec4(convertMat * yuv, 1.0);\n" +
" }";
/**
* 片段着色器，灰度效果。不需要 U V 数据（Java代码中可以做对应修改，仅需拷贝NV21数据中的Y分量即可）
*/
public static String FRAG_SHADER_GRAY =
"precision mediump float;\n" +
" varying vec2 tc;\n" +
" uniform sampler2D ySampler;\n" +
" void main()\n" +
" {\n" +
" vec3 yuv;\n" +
" yuv.x = texture2D(ySampler, tc).r;\n" +
" gl_FragColor = vec4(vec3(yuv.x), 1.0);\n" +
" }";
/**
* 片段着色器，浮雕效果。不需要 U V 数据（Java代码中可以做对应修改，仅需拷贝NV21数据中的Y分量即可）
*/
public static String FRAG_SHADER_SCULPTURE =
"precision mediump float;\n" +
"varying vec2 tc;\n" +
" uniform sampler2D ySampler;\n" +
" const vec2 texSize = vec2(100.0, 100.0);\n" +
" const vec4 sculptureColor = vec4(0.5, 0.5, 0.5, 1.0);\n" +
"\n" +
"void main()\n" +
"{\n" +
" vec2 upLeftCoord = vec2(tc.x-1.0/texSize.x, tc.y-1.0/texSize.y);\n" +
" vec4 curColor = texture2D(ySampler, tc);\n" +
" vec4 upLeftColor = texture2D(ySampler, upLeftCoord);\n" +
" vec4 delColor = curColor - upLeftColor;\n" +
" gl_FragColor = vec4(vec3(delColor), 0.0) + sculptureColor;\n" +
"}";
//SQUARE_VERTICES每2个值作为一个顶点
static final int COUNT_PER_SQUARE_VERTICE = 2;
//COORD_VERTICES每2个值作为一个顶点
static final int COUNT_PER_COORD_VERTICES = 2;
/**
* 显示的顶点
*/
static final float[] SQUARE_VERTICES = {
-1.0f, -1.0f,
1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, 1.0f
};
/**
* 原数据显示
* 0,1***********1,1
* * *
* * *
* * *
* * *
* * *
* 0,0***********1,0
*/
static final float[] COORD_VERTICES = {
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f
};
/**
* 逆时针旋转90度显示
* 1,1***********1,0
* * *
* * *
* * *
* * *
* * *
* 0,1***********0,0
*/
static final float[] ROTATE_90_COORD_VERTICES = {
1.0f, 1.0f,
1.0f, 0.0f,
0.0f, 1.0f,
0.0f, 0.0f
};
/**
* 逆时针旋转180度显示
* 0,1***********1,1
* * *
* * *
* * *
* * *
* * *
* 0,0***********1,0
*/
static final float[] ROTATE_180_COORD_VERTICES = {
1.0f, 0.0f,
0.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
/**
* 逆时针旋转270度显示
* 0,1***********1,1
* * *
* * *
* * *
* * *
* * *
* 0,0***********1,0
*/
static final float[] ROTATE_270_COORD_VERTICES = {
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f
};
/**
* 镜像显示
* 1,1***********0,1
* * *
* * *
* * *
* * *
* * *
* 1,0***********0,0
*/
static final float[] MIRROR_COORD_VERTICES = {
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f
};
/**
* 镜像并逆时针旋转90度显示
* 0,1***********0,0
* * *
* * *
* * *
* * *
* * *
* 1,1***********1,0
*/
static final float[] ROTATE_90_MIRROR_COORD_VERTICES = {
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 1.0f,
1.0f, 0.0f
};
/**
* 镜像并逆时针旋转180度显示
* 1,0***********0,0
* * *
* * *
* * *
* * *
* * *
* 1,1***********0,1
*/
static final float[] ROTATE_180_MIRROR_COORD_VERTICES = {
1.0f, 0.0f,
0.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
/**
* 镜像并逆时针旋转270度显示
* 1,0***********1,1
* * *
* * *
* * *
* * *
* * *
* 0,0***********0,1
*/
static final float[] ROTATE_270_MIRROR_COORD_VERTICES = {
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
0.0f, 1.0f
};
/**
* 创建OpenGL Program，并链接
*
* @param fragmentShaderCode 片段着色器代码
* @return OpenGL Program对象的引用
*/
static int createShaderProgram(String fragmentShaderCode) {
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER);
int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
// 创建一个空的OpenGL ES Program
int mProgram = GLES20.glCreateProgram();
// 将vertex shader添加到program
GLES20.glAttachShader(mProgram, vertexShader);
// 将fragment shader添加到program
GLES20.glAttachShader(mProgram, fragmentShader);
// 链接创建好的 OpenGL ES program
GLES20.glLinkProgram(mProgram);
// 检查链接状态
IntBuffer linked = IntBuffer.allocate(1);
GLES20.glGetProgramiv(mProgram, GLES20.GL_LINK_STATUS, linked);
if (linked.get(0) == 0) {
return -1;
}
return mProgram;
}
/**
* 加载着色器
*
* @param type 着色器类型，可以是片段着色器{@link GLES20#GL_FRAGMENT_SHADER}或顶点着色器{@link GLES20#GL_VERTEX_SHADER}
* @param shaderCode 着色器代码
* @return 着色器对象的引用
*/
private static int loadShader(int type, String shaderCode) {
//创建空的shader
int shader = GLES20.glCreateShader(type);
//加载shader代码
GLES20.glShaderSource(shader, shaderCode);
//编译shader
GLES20.glCompileShader(shader);
//检查编译是否成功
IntBuffer compiled = IntBuffer.allocate(1);
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled);
if (compiled.get(0) == 0) {
return 0;
}
return shader;
}
}