? ? ? ? 经过一段时间的学习,我发现OpenGL是不支持字符绘制的,就是官方的API没有字符绘制的方法。但是如果有字符绘制的需求,还是有别的办法来实现,那就是把字符转换成图片,然后通过渲染纹理的方式把图片绘制出来。老规矩,先上效果图:
OpenGLES字符绘制顶点shader:
uniform mat4 vMatrix;
attribute vec4 vPosition;
attribute vec2 vTextureCoordinate;
varying vec2 aTextureCoordinate;
void main() {????
????aTextureCoordinate = vTextureCoordinate;???
? ? gl_Position = vMatrix * vPosition;
}
片段shader:
precision mediump float;
uniform sampler2D u_TextureUnit;
varying vec2 aTextureCoordinate;
void main() {
????gl_FragColor = texture2D(u_TextureUnit, aTextureCoordinate);
}
模型绘制类:
public class TextureModel {
????private int programId;
????private float[] matrix = new float[16];
????private int glHMatrix;
????private int glHPosition;
????private int glHCoordinates;
????private int glHTexture;
????private FloatBuffer bufPos;
????private FloatBuffer bufCoord;
????private Bitmap bitmap;
????private int[] textureId = new int[1];
????private final float[] sCoord = { 0.0f, 0.0f, 0f, 0.0f, 1.0f, 0f, 1.0f, 0.0f, 0f, 1.0f, 1.0f, 0f };
????public TextureModel(){
????????Matrix.setIdentityM(matrix, 0);
????????bufCoord = GlUtil.createFloatBuffer(sCoord);
????}
????public float[] getMatrix() { return matrix; }
????public void createProgram(){
????????programId = GlUtil.createProgram(ResReadUtils.readResource(R.raw.texture_vertex_shader), ResReadUtils.readResource(R.raw.texture_fragment_shader));
????????glHMatrix = GLES20.glGetUniformLocation(programId, "vMatrix");
????????glHPosition = GLES20.glGetAttribLocation(programId, "vPosition");
????????glHCoordinates = GLES20.glGetAttribLocation(programId, "vTextureCoordinate");
????????glHTexture = GLES20.glGetUniformLocation(programId, "u_TextureUnit");
????}
????public void setBitmap(Bitmap bitmap) { this.bitmap = bitmap; }
????public void createTexture(){
????????if (bitmap!=null && !bitmap.isRecycled()) {
????????????GLES20.glGenTextures(1, textureId, 0);
????????????GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId[0]);
????????????GLES20.glTexParameterf(GLE(jk是什么意思是什么?JK是“じょしこうこうせい ”(女子高校生)罗马音 jyoshi koukousei 的简写(取其中“J”和“K”),通常指日本女高中生;JK也是ACGN次文化中的萌属性之一。)S20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_LINEAR);
????????????GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR_MIPMAP_LINEAR);
????????????GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);? ?
?????????????GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
????????????GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
????????????GLES20.glGenerateMipmap(GLES20.GL_TEXTURE_2D);
????????????bitmap.recycle();
????????????GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
????????}
????}
????public void setDrawPosition(float[] position){
????????if (position==null || position.length!=12) { return; }
????????bufPos = GlUtil.createFloatBuffer(position);
????}
????public void deleteTexture(){
????????GLES20.glDeleteTextures(programId, textureId, 0);
????}
????public void drawSelf(){
????????GLES20.glUseProgram(programId);
????????GLES20.glUniformMatrix4fv(glHMatrix, 1, false, matrix, 0);
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