Given the following arrays of vertices and colors set up a vertex array object a

Question

Given the following arrays of vertices and colors set up a vertex array object and a buffer with 2 sub buffers, one with the vertex data and one with color data, using OpenGL. Setup 2 attributes for the vertex shader "vPosition" and "vColor".

1. Given the following arrays of vertices and colors set up a vertex array object and a buffer with 2 sub-buffers, one with the vertex data and one with the color data, using OpenGL Setup 2 attributes for the vertex shader "vPosition" and "vColor 1 float vertices[] = { 0.0, 0.0, 0.0. 1.0. // x, y, z. W 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, float colors[] = { 1.0, 1.0, 1.0. 1.0, // r, g, b, a

Explanation / Answer

int a[10];

int (*p_a)[10] = &a;

int with bounds 10, i.e. p_a = &a[0];

int *p_int = a;

int b[10][20];

int (*p_b)[20] = b;

int foo(int a[n]);

int f(float array[const restrict]);

f(float *const restrict array);

void foo(int a[static 10]);

float a[m*n*sizeof(float)];

for (i = 0; i < m; ++i)

for (j = 0; j < n; ++j)

a[i*n + j] = 1.0;

float a[m][n];

int i, j;

for (i = 0; i < m; ++i)

for (j = 0; j < n; ++j)

a[i][j] = 1.0;

char* pChar2D[] = {"A long long long string", "short", "something else"};

printf(pChar2D[0]);

int r0[] = malloc(sizeof(int) * 10);

int r1[] = malloc(sizeof(int) * 2);;

int *jagged[] = { r0, r1 };

printf("%d %d, jagged[0][9], jagged[1][1]);

8

9

10

11

12

13

14

15

int a[100] = {[0]=5, [99]=100};

struct S1 {

int i;

float f;

int a[2];

};

struct S1 x = {

.f=3.1,

.i=2,

.a[1]=9

};

(float){3.14};

(struct POINT){10, 10};

(char []){"Compound Literal Array"};

(const char[]){"A CONSTANT compound literal array"};

var vs_points = `

attribute vec3 vPosition;

attribute vec4 vRgbaColor;

attribute float vPointSize;

varying vec4 color;

void

main()

{

gl_Position = vec4(vPosition, 1.0);

gl_PointSize = vPointSize;

color = vRgbaColor;

}`;

var fs_point_default = `

precision mediump float;

varying vec4 color;

void

main()

{

float alpha = 1.0;

gl_FragColor = color * (alpha);

}`;

var point = [0.0, 0.0, 0.0];

var color = [1.0, 0.0, 0.0, 1.0];

var size = [400.0];

var canvas = document.getElementById("point-canvas");

initGL(canvas);

shaderPointDefault = initShaders(0);

initBuffers(point, color, size);

gl.clearColor(0.0, 0.0, 0.0, 1.0);

gl.enable(gl.DEPTH_TEST);

drawScene(shaderPointDefault);

var fs_point_alias = `

precision mediump float;

varying vec4 color;

void

main()

{

float r = 0.0, delta = 0.0, alpha = 1.0;

vec2 cxy = 2.0 * gl_PointCoord - 1.0;

r = dot(cxy, cxy);

if (r > 1.0) {

discard;

}

gl_FragColor = color * (alpha);

}`;

var fs_point_anti_alias = `

#ifdef GL_OES_standard_derivatives

#extension GL_OES_standard_derivatives : enable

#endif

precision mediump float;

varying vec4 color;

void main()

{

float r = 0.0, delta = 0.0, alpha = 1.0;

vec2 cxy = 2.0 * gl_PointCoord - 1.0;

r = dot(cxy, cxy);

#ifdef GL_OES_standard_derivatives

delta = fwidth(r);

alpha = 1.0 - smoothstep(1.0 - delta, 1.0 + delta, r);

#endif

gl_FragColor = color * alpha;

}`;

void i2c_read(byte seven_bit_address, byte reg, byte* pData, byte len ) {

byte i = 0;

Wire.beginTransmission(seven_bit_address);

Wire.write(reg);

Wire.endTransmission(false);

Wire.requestFrom(seven_bit_address, len, true);

while (Wire.available() && (i < len))

{

*pData++ = Wire.read();

i++;

}

}

void i2c_write(byte seven_bit_address, byte reg, byte* pData, byte len ) {

Wire.beginTransmission(seven_bit_address);

Wire.write(reg);

for (int i = 0; i < len; i++) {

Wire.write(*pData++);

}

Wire.endTransmission();

}

void i2c_write(byte seven_bit_address, byte reg, byte value ) {

Wire.beginTransmission(seven_bit_address);

Wire.write(reg);

Wire.write(value);

Wire.endTransmission();

}

Serial.begin(230400);

Wire.begin();

Wire.setClock(400000L);

byte id;

i2c_read(0x57, 0xFF, &id, 1);

Serial.println("Part ID:");

Serial.print(id, HEX);

byte data;

data = (byte)0xA << 4 | (byte)0xB;

i2c_write(0x57, 0x09, &data, 1);

i2c_read(0x57, 0x09, &data, 1);

Serial.println("LED Config = ");

Serial.print(data, HEX);

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