private int PreloadShaders()
{
string vertexShaderSrc = "precision highp float;\n" +
"precision highp int;\n" +
"varying vec4 Color;\n" +
"uniform float gScale;\n" +
"uniform mat4 world;\n" +
"attribute vec4 Position;\n" +
"void main() { gl_Position = vec4(gScale * Position.x, gScale * Position.y, Position.z, 1.0) * world; \n" +
"Color = clamp(Position, 0.2, 0.8); }";
string fragmentShaderSrc = "precision mediump float;\n" +
"precision mediump int;\n" +
"varying vec4 Color;\n" +
//"uniform vec4 color;\n" +
"void main() { gl_FragColor = Color; }";
int vertexShader = LoadShader(GLES32.GlVertexShader, vertexShaderSrc);
int fragmentShader = LoadShader(GLES32.GlFragmentShader, fragmentShaderSrc);
int program = GLES32.GlCreateProgram();
GLES32.GlAttachShader(program, vertexShader);
GLES32.GlAttachShader(program, fragmentShader);
GLES32.GlBindAttribLocation(program, 0, "Position");
GLES32.GlLinkProgram(program);
return(program);
}
private int LoadShader(int type, string shaderCode)
{
int shader = GLES32.GlCreateShader(type);
GLES32.GlShaderSource(shader, shaderCode);
GLES32.GlCompileShader(shader);
return(shader);
}
private void Render(Rectangle R)
{
if (program == 0)
{
program = PreloadShaders();
GLES32.GlEnable(GLES32.GlVertexArray);
GLES32.GlGenVertexArrays(1, VAO, 0);
GLES32.GlBindVertexArray(VAO[0]);
GLES32.GlGenBuffers(1, VBO, 0);
GLES32.GlBindBuffer(GLES32.GlArrayBuffer, VBO[0]);
GLES32.GlBufferData(GLES32.GlArrayBuffer, vertices.Length * sizeof(float), buffer, GLES32.GlStaticDraw);
int posloc = GLES32.GlGetAttribLocation(program, "Position");
GLES32.GlVertexAttribPointer(posloc, 3, GLES32.GlFloat, false, 0, 0);
GLES32.GlEnableVertexAttribArray(posloc);
GLES32.GlGenBuffers(1, IBO, 0);
GLES32.GlBindBuffer(GLES32.GlElementArrayBuffer, IBO[0]);
GLES32.GlBufferData(GLES32.GlElementArrayBuffer, inds.Length * sizeof(byte), ibuffer, GLES32.GlStaticDraw);
GLES32.GlBindBuffer(GLES32.GlElementArrayBuffer, 0);
GLES32.GlBindBuffer(GLES32.GlArrayBuffer, 0);
GLES32.GlBindVertexArray(0);
GLES32.GlUseProgram(program);
}
GLES32.GlClearColor(0, 0, 0, 1);
GLES32.GlClear(GLES32.GlColorBufferBit | GLES32.GlDepthBufferBit);
GLES32.GlViewport(0, 0, (int)(GLView.Width * 3), (int)(GLView.Height * 3));
GLES32.GlLineWidth(50);
int scaleLocation = GLES32.GlGetUniformLocation(program, "gScale");
//scale = (scale + 0.005f) % 1;
GLES32.GlUniform1f(scaleLocation, scale);
/*int colorLocation = GLES32.GlGetUniformLocation(program, "color");
* red = (float)((red + 0.005f) % (2.0 * Math.PI));
* GLES32.GlUniform4f(colorLocation, (float)Math.Abs(Math.Sin(red)), 0, 0, 1);*/
int worldLocation = GLES32.GlGetUniformLocation(program, "world");
//Matrix.TranslateM(mat, 0, 0f, 0f, 0f);
Matrix.RotateM(mat, 0, 1 * rotateSide, 0, 0, 1);
//Matrix.TranslateM(mat, 0, 0f, 0f, 0f);
GLES32.GlUniformMatrix4fv(worldLocation, 1, true, mat, 0);
GLES32.GlBindVertexArray(VAO[0]);
GLES32.GlBindBuffer(GLES32.GlElementArrayBuffer, IBO[0]);
GLES32.GlDrawElements(GLES32.GlTriangles, 6, GLES32.GlUnsignedByte, 0);
//GLES32.GlBindBuffer(GLES32.GlArrayBuffer, VBO[0]);
//GLES32.GlDrawArrays(GLES32.GlTriangleFan, 0, 7);
GLES32.GlFinish();
}
