使用OpenGLEs为Android绘制像素

Question

如何使用OpenGlE为Android绘制像素（2D视图）？

这是简单，当我们使用绘制

draw(Canvas canvas) 
{ 
    ... 
} 

所以使用它我们得出

canvas.drawPoint(i, j, paint); 

但OpenGlEs我还没有得到任何类似的功能。

请提前回复 谢谢

Answer 1

glDrawElements（GL_POINTS，0，NUM_POINTS，point_array）; 如果您先使用glVertexPointer，则也可以使用glDrawArrays。

使用glPointParameter，glPointSize和glColor修改点的外观。使用glPointSizePointer可以指定一个点大小的数组，这对于粒子效果非常有用。

Answer 2

GLES20Renderer.programLight = GLES20.glCreateProgram(); 
    int vertexShaderLight  = GLES20Renderer.loadShader(GLES20.GL_VERTEX_SHADER, GLES20Renderer.vertexShaderCodeLight); 
    int fragmentShaderLight  = GLES20Renderer.loadShader(GLES20.GL_FRAGMENT_SHADER, GLES20Renderer.fragmentShaderCodeLight); 
    GLES20.glAttachShader(GLES20Renderer.programLight, vertexShaderLight); 
    GLES20.glAttachShader(GLES20Renderer.programLight, fragmentShaderLight); 
    GLES20.glLinkProgram(GLES20Renderer.programLight); 
    uPLocationLight    = GLES20.glGetUniformLocation(GLES20Renderer.programLight, "uP"); 
    uVPositionLocationLight  = GLES20.glGetUniformLocation(GLES20Renderer.programLight, "uVPosition"); 

    GLES20.glUseProgram(GLES20Renderer.programLight); 
    GLES20.glUniform4f(uVPositionLocationLight, LightPosInEyeSpace[0], LightPosInEyeSpace[1], LightPosInEyeSpace[2], LightPosInEyeSpace[3]); 
    GLES20.glUniformMatrix4fv(uPLocationLight, 1, false, ProjectionMatrix, 0); 
    GLES20.glDrawArrays(GLES20.GL_POINTS, 0, 1); 


private static final String vertexShaderCodeLight = 
     "uniform vec4 uVPosition;     \n" 
    + "uniform mat4 uP;       \n" 
    + "void main(){        \n" 
    + " gl_PointSize = 15.0;      \n" 
    + " gl_Position = uP * uVPosition;   \n" 
    + "}           \n"; 
private static final String fragmentShaderCodeLight = 
     "#ifdef GL_FRAGMENT_PRECISION_HIGH   \n" 
    + "precision highp float;      \n" 
    + "#else          \n" 
    + "precision mediump float;     \n" 
    + "#endif          \n" 
    + "void main(){        \n" 
    + " gl_FragColor = vec4(1.0,1.0,1.0,1.0);  \n" 
    + "}           \n";