使用OpenGLEs爲Android繪製像素

Question

如何使用OpenGlE爲Android繪製像素（2D視圖）？

這是簡單，當我們使用繪製

draw(Canvas canvas) 
{ 
    ... 
} 

所以使用它我們得出

canvas.drawPoint(i, j, paint); 

但OpenGlEs我還沒有得到任何類似的功能。

請提前回復 謝謝

Answer 1

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

使用glPointParameter，glPointSize和glColor修改點的外觀。使用glPointSizePointer可以指定一個點大小的數組，這對於粒子效果非常有用。

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";