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view16_teapot.cpp
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#include "view16_teapot.h"
#include "util.h"
#include "global.h"
GLuint view16_teapot_program = 0;
GLuint view16_vbo_teapot_vertices = 0, view16_vbo_teapot_colors = 0,
view16_ibo_teapot_elements = 0, view16_vbo_teapot_cp_vertices = 0,
view16_vbo_teapot_cp_colors = 0, view16_ibo_teapot_cp_elements = 0;
int view16_screen_width = SUB_WINDOW_HEIGHT,
view16_screen_height = SUB_WINDOW_HEIGHT;
GLint view16_attribute_coord3d = -1, view16_attribute_v_color = -1;
GLint view16_uniform_mvp = -1;
struct vertex {GLfloat x, y, z;};
// TODO: clean this
struct vertex view16_teapot_cp_vertices[] = {
// 1
{ 1.4 , 0.0 , 2.4 },
{ 1.4 , -0.784 , 2.4 },
{ 0.784 , -1.4 , 2.4 },
{ 0.0 , -1.4 , 2.4 },
{ 1.3375, 0.0 , 2.53125 },
{ 1.3375, -0.749 , 2.53125 },
{ 0.749 , -1.3375, 2.53125 },
{ 0.0 , -1.3375, 2.53125 },
{ 1.4375, 0.0 , 2.53125 },
{ 1.4375, -0.805 , 2.53125 },
// 11
{ 0.805 , -1.4375, 2.53125 },
{ 0.0 , -1.4375, 2.53125 },
{ 1.5 , 0.0 , 2.4 },
{ 1.5 , -0.84 , 2.4 },
{ 0.84 , -1.5 , 2.4 },
{ 0.0 , -1.5 , 2.4 },
{ -0.784 , -1.4 , 2.4 },
{ -1.4 , -0.784 , 2.4 },
{ -1.4 , 0.0 , 2.4 },
{ -0.749 , -1.3375, 2.53125 },
// 21
{ -1.3375, -0.749 , 2.53125 },
{ -1.3375, 0.0 , 2.53125 },
{ -0.805 , -1.4375, 2.53125 },
{ -1.4375, -0.805 , 2.53125 },
{ -1.4375, 0.0 , 2.53125 },
{ -0.84 , -1.5 , 2.4 },
{ -1.5 , -0.84 , 2.4 },
{ -1.5 , 0.0 , 2.4 },
{ -1.4 , 0.784 , 2.4 },
{ -0.784 , 1.4 , 2.4 },
// 31
{ 0.0 , 1.4 , 2.4 },
{ -1.3375, 0.749 , 2.53125 },
{ -0.749 , 1.3375, 2.53125 },
{ 0.0 , 1.3375, 2.53125 },
{ -1.4375, 0.805 , 2.53125 },
{ -0.805 , 1.4375, 2.53125 },
{ 0.0 , 1.4375, 2.53125 },
{ -1.5 , 0.84 , 2.4 },
{ -0.84 , 1.5 , 2.4 },
{ 0.0 , 1.5 , 2.4 },
// 41
{ 0.784 , 1.4 , 2.4 },
{ 1.4 , 0.784 , 2.4 },
{ 0.749 , 1.3375, 2.53125 },
{ 1.3375, 0.749 , 2.53125 },
{ 0.805 , 1.4375, 2.53125 },
{ 1.4375, 0.805 , 2.53125 },
{ 0.84 , 1.5 , 2.4 },
{ 1.5 , 0.84 , 2.4 },
{ 1.75 , 0.0 , 1.875 },
{ 1.75 , -0.98 , 1.875 },
// 51
{ 0.98 , -1.75 , 1.875 },
{ 0.0 , -1.75 , 1.875 },
{ 2.0 , 0.0 , 1.35 },
{ 2.0 , -1.12 , 1.35 },
{ 1.12 , -2.0 , 1.35 },
{ 0.0 , -2.0 , 1.35 },
{ 2.0 , 0.0 , 0.9 },
{ 2.0 , -1.12 , 0.9 },
{ 1.12 , -2.0 , 0.9 },
{ 0.0 , -2.0 , 0.9 },
// 61
{ -0.98 , -1.75 , 1.875 },
{ -1.75 , -0.98 , 1.875 },
{ -1.75 , 0.0 , 1.875 },
{ -1.12 , -2.0 , 1.35 },
{ -2.0 , -1.12 , 1.35 },
{ -2.0 , 0.0 , 1.35 },
{ -1.12 , -2.0 , 0.9 },
{ -2.0 , -1.12 , 0.9 },
{ -2.0 , 0.0 , 0.9 },
{ -1.75 , 0.98 , 1.875 },
// 71
{ -0.98 , 1.75 , 1.875 },
{ 0.0 , 1.75 , 1.875 },
{ -2.0 , 1.12 , 1.35 },
{ -1.12 , 2.0 , 1.35 },
{ 0.0 , 2.0 , 1.35 },
{ -2.0 , 1.12 , 0.9 },
{ -1.12 , 2.0 , 0.9 },
{ 0.0 , 2.0 , 0.9 },
{ 0.98 , 1.75 , 1.875 },
{ 1.75 , 0.98 , 1.875 },
// 81
{ 1.12 , 2.0 , 1.35 },
{ 2.0 , 1.12 , 1.35 },
{ 1.12 , 2.0 , 0.9 },
{ 2.0 , 1.12 , 0.9 },
{ 2.0 , 0.0 , 0.45 },
{ 2.0 , -1.12 , 0.45 },
{ 1.12 , -2.0 , 0.45 },
{ 0.0 , -2.0 , 0.45 },
{ 1.5 , 0.0 , 0.225 },
{ 1.5 , -0.84 , 0.225 },
// 91
{ 0.84 , -1.5 , 0.225 },
{ 0.0 , -1.5 , 0.225 },
{ 1.5 , 0.0 , 0.15 },
{ 1.5 , -0.84 , 0.15 },
{ 0.84 , -1.5 , 0.15 },
{ 0.0 , -1.5 , 0.15 },
{ -1.12 , -2.0 , 0.45 },
{ -2.0 , -1.12 , 0.45 },
{ -2.0 , 0.0 , 0.45 },
{ -0.84 , -1.5 , 0.225 },
// 101
{ -1.5 , -0.84 , 0.225 },
{ -1.5 , 0.0 , 0.225 },
{ -0.84 , -1.5 , 0.15 },
{ -1.5 , -0.84 , 0.15 },
{ -1.5 , 0.0 , 0.15 },
{ -2.0 , 1.12 , 0.45 },
{ -1.12 , 2.0 , 0.45 },
{ 0.0 , 2.0 , 0.45 },
{ -1.5 , 0.84 , 0.225 },
{ -0.84 , 1.5 , 0.225 },
// 111
{ 0.0 , 1.5 , 0.225 },
{ -1.5 , 0.84 , 0.15 },
{ -0.84 , 1.5 , 0.15 },
{ 0.0 , 1.5 , 0.15 },
{ 1.12 , 2.0 , 0.45 },
{ 2.0 , 1.12 , 0.45 },
{ 0.84 , 1.5 , 0.225 },
{ 1.5 , 0.84 , 0.225 },
{ 0.84 , 1.5 , 0.15 },
{ 1.5 , 0.84 , 0.15 },
// 121
{ -1.6 , 0.0 , 2.025 },
{ -1.6 , -0.3 , 2.025 },
{ -1.5 , -0.3 , 2.25 },
{ -1.5 , 0.0 , 2.25 },
{ -2.3 , 0.0 , 2.025 },
{ -2.3 , -0.3 , 2.025 },
{ -2.5 , -0.3 , 2.25 },
{ -2.5 , 0.0 , 2.25 },
{ -2.7 , 0.0 , 2.025 },
{ -2.7 , -0.3 , 2.025 },
// 131
{ -3.0 , -0.3 , 2.25 },
{ -3.0 , 0.0 , 2.25 },
{ -2.7 , 0.0 , 1.8 },
{ -2.7 , -0.3 , 1.8 },
{ -3.0 , -0.3 , 1.8 },
{ -3.0 , 0.0 , 1.8 },
{ -1.5 , 0.3 , 2.25 },
{ -1.6 , 0.3 , 2.025 },
{ -2.5 , 0.3 , 2.25 },
{ -2.3 , 0.3 , 2.025 },
// 141
{ -3.0 , 0.3 , 2.25 },
{ -2.7 , 0.3 , 2.025 },
{ -3.0 , 0.3 , 1.8 },
{ -2.7 , 0.3 , 1.8 },
{ -2.7 , 0.0 , 1.575 },
{ -2.7 , -0.3 , 1.575 },
{ -3.0 , -0.3 , 1.35 },
{ -3.0 , 0.0 , 1.35 },
{ -2.5 , 0.0 , 1.125 },
{ -2.5 , -0.3 , 1.125 },
// 151
{ -2.65 , -0.3 , 0.9375 },
{ -2.65 , 0.0 , 0.9375 },
{ -2.0 , -0.3 , 0.9 },
{ -1.9 , -0.3 , 0.6 },
{ -1.9 , 0.0 , 0.6 },
{ -3.0 , 0.3 , 1.35 },
{ -2.7 , 0.3 , 1.575 },
{ -2.65 , 0.3 , 0.9375 },
{ -2.5 , 0.3 , 1.1255 },
{ -1.9 , 0.3 , 0.6 },
// 161
{ -2.0 , 0.3 , 0.9 },
{ 1.7 , 0.0 , 1.425 },
{ 1.7 , -0.66 , 1.425 },
{ 1.7 , -0.66 , 0.6 },
{ 1.7 , 0.0 , 0.6 },
{ 2.6 , 0.0 , 1.425 },
{ 2.6 , -0.66 , 1.425 },
{ 3.1 , -0.66 , 0.825 },
{ 3.1 , 0.0 , 0.825 },
{ 2.3 , 0.0 , 2.1 },
// 171
{ 2.3 , -0.25 , 2.1 },
{ 2.4 , -0.25 , 2.025 },
{ 2.4 , 0.0 , 2.025 },
{ 2.7 , 0.0 , 2.4 },
{ 2.7 , -0.25 , 2.4 },
{ 3.3 , -0.25 , 2.4 },
{ 3.3 , 0.0 , 2.4 },
{ 1.7 , 0.66 , 0.6 },
{ 1.7 , 0.66 , 1.425 },
{ 3.1 , 0.66 , 0.825 },
// 181
{ 2.6 , 0.66 , 1.425 },
{ 2.4 , 0.25 , 2.025 },
{ 2.3 , 0.25 , 2.1 },
{ 3.3 , 0.25 , 2.4 },
{ 2.7 , 0.25 , 2.4 },
{ 2.8 , 0.0 , 2.475 },
{ 2.8 , -0.25 , 2.475 },
{ 3.525 , -0.25 , 2.49375 },
{ 3.525 , 0.0 , 2.49375 },
{ 2.9 , 0.0 , 2.475 },
// 191
{ 2.9 , -0.15 , 2.475 },
{ 3.45 , -0.15 , 2.5125 },
{ 3.45 , 0.0 , 2.5125 },
{ 2.8 , 0.0 , 2.4 },
{ 2.8 , -0.15 , 2.4 },
{ 3.2 , -0.15 , 2.4 },
{ 3.2 , 0.0 , 2.4 },
{ 3.525 , 0.25 , 2.49375 },
{ 2.8 , 0.25 , 2.475 },
{ 3.45 , 0.15 , 2.5125 },
// 201
{ 2.9 , 0.15 , 2.475 },
{ 3.2 , 0.15 , 2.4 },
{ 2.8 , 0.15 , 2.4 },
{ 0.0 , 0.0 , 3.15 },
{ 0.0 , -0.002 , 3.15 },
{ 0.002 , 0.0 , 3.15 },
{ 0.8 , 0.0 , 3.15 },
{ 0.8 , -0.45 , 3.15 },
{ 0.45 , -0.8 , 3.15 },
{ 0.0 , -0.8 , 3.15 },
// 211
{ 0.0 , 0.0 , 2.85 },
{ 0.2 , 0.0 , 2.7 },
{ 0.2 , -0.112 , 2.7 },
{ 0.112 , -0.2 , 2.7 },
{ 0.0 , -0.2 , 2.7 },
{ -0.002 , 0.0 , 3.15 },
{ -0.45 , -0.8 , 3.15 },
{ -0.8 , -0.45 , 3.15 },
{ -0.8 , 0.0 , 3.15 },
{ -0.112 , -0.2 , 2.7 },
// 221
{ -0.2 , -0.112 , 2.7 },
{ -0.2 , 0.0 , 2.7 },
{ 0.0 , 0.002 , 3.15 },
{ -0.8 , 0.45 , 3.15 },
{ -0.45 , 0.8 , 3.15 },
{ 0.0 , 0.8 , 3.15 },
{ -0.2 , 0.112 , 2.7 },
{ -0.112 , 0.2 , 2.7 },
{ 0.0 , 0.2 , 2.7 },
{ 0.45 , 0.8 , 3.15 },
// 231
{ 0.8 , 0.45 , 3.15 },
{ 0.112 , 0.2 , 2.7 },
{ 0.2 , 0.112 , 2.7 },
{ 0.4 , 0.0 , 2.55 },
{ 0.4 , -0.224 , 2.55 },
{ 0.224 , -0.4 , 2.55 },
{ 0.0 , -0.4 , 2.55 },
{ 1.3 , 0.0 , 2.55 },
{ 1.3 , -0.728 , 2.55 },
{ 0.728 , -1.3 , 2.55 },
// 241
{ 0.0 , -1.3 , 2.55 },
{ 1.3 , 0.0 , 2.4 },
{ 1.3 , -0.728 , 2.4 },
{ 0.728 , -1.3 , 2.4 },
{ 0.0 , -1.3 , 2.4 },
{ -0.224 , -0.4 , 2.55 },
{ -0.4 , -0.224 , 2.55 },
{ -0.4 , 0.0 , 2.55 },
{ -0.728 , -1.3 , 2.55 },
{ -1.3 , -0.728 , 2.55 },
// 251
{ -1.3 , 0.0 , 2.55 },
{ -0.728 , -1.3 , 2.4 },
{ -1.3 , -0.728 , 2.4 },
{ -1.3 , 0.0 , 2.4 },
{ -0.4 , 0.224 , 2.55 },
{ -0.224 , 0.4 , 2.55 },
{ 0.0 , 0.4 , 2.55 },
{ -1.3 , 0.728 , 2.55 },
{ -0.728 , 1.3 , 2.55 },
{ 0.0 , 1.3 , 2.55 },
// 261
{ -1.3 , 0.728 , 2.4 },
{ -0.728 , 1.3 , 2.4 },
{ 0.0 , 1.3 , 2.4 },
{ 0.224 , 0.4 , 2.55 },
{ 0.4 , 0.224 , 2.55 },
{ 0.728 , 1.3 , 2.55 },
{ 1.3 , 0.728 , 2.55 },
{ 0.728 , 1.3 , 2.4 },
{ 1.3 , 0.728 , 2.4 },
};
#define TEAPOT_NB_PATCHES 28
#define ORDER 3
GLushort view16_teapot_patches[][ORDER+1][ORDER+1] = {
// rim
{ { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 }, { 13, 14, 15, 16, } },
{ { 4, 17, 18, 19 }, { 8, 20, 21, 22 }, { 12, 23, 24, 25 }, { 16, 26, 27, 28, } },
{ { 19, 29, 30, 31 }, { 22, 32, 33, 34 }, { 25, 35, 36, 37 }, { 28, 38, 39, 40, } },
{ { 31, 41, 42, 1 }, { 34, 43, 44, 5 }, { 37, 45, 46, 9 }, { 40, 47, 48, 13, } },
// body
{ { 13, 14, 15, 16 }, { 49, 50, 51, 52 }, { 53, 54, 55, 56 }, { 57, 58, 59, 60, } },
{ { 16, 26, 27, 28 }, { 52, 61, 62, 63 }, { 56, 64, 65, 66 }, { 60, 67, 68, 69, } },
{ { 28, 38, 39, 40 }, { 63, 70, 71, 72 }, { 66, 73, 74, 75 }, { 69, 76, 77, 78, } },
{ { 40, 47, 48, 13 }, { 72, 79, 80, 49 }, { 75, 81, 82, 53 }, { 78, 83, 84, 57, } },
{ { 57, 58, 59, 60 }, { 85, 86, 87, 88 }, { 89, 90, 91, 92 }, { 93, 94, 95, 96, } },
{ { 60, 67, 68, 69 }, { 88, 97, 98, 99 }, { 92, 100, 101, 102 }, { 96, 103, 104, 105, } },
{ { 69, 76, 77, 78 }, { 99, 106, 107, 108 }, { 102, 109, 110, 111 }, { 105, 112, 113, 114, } },
{ { 78, 83, 84, 57 }, { 108, 115, 116, 85 }, { 111, 117, 118, 89 }, { 114, 119, 120, 93, } },
// handle
{ { 121, 122, 123, 124 }, { 125, 126, 127, 128 }, { 129, 130, 131, 132 }, { 133, 134, 135, 136, } },
{ { 124, 137, 138, 121 }, { 128, 139, 140, 125 }, { 132, 141, 142, 129 }, { 136, 143, 144, 133, } },
{ { 133, 134, 135, 136 }, { 145, 146, 147, 148 }, { 149, 150, 151, 152 }, { 69, 153, 154, 155, } },
{ { 136, 143, 144, 133 }, { 148, 156, 157, 145 }, { 152, 158, 159, 149 }, { 155, 160, 161, 69, } },
// spout
{ { 162, 163, 164, 165 }, { 166, 167, 168, 169 }, { 170, 171, 172, 173 }, { 174, 175, 176, 177, } },
{ { 165, 178, 179, 162 }, { 169, 180, 181, 166 }, { 173, 182, 183, 170 }, { 177, 184, 185, 174, } },
{ { 174, 175, 176, 177 }, { 186, 187, 188, 189 }, { 190, 191, 192, 193 }, { 194, 195, 196, 197, } },
{ { 177, 184, 185, 174 }, { 189, 198, 199, 186 }, { 193, 200, 201, 190 }, { 197, 202, 203, 194, } },
// lid
{ { 204, 204, 204, 204 }, { 207, 208, 209, 210 }, { 211, 211, 211, 211 }, { 212, 213, 214, 215, } },
{ { 204, 204, 204, 204 }, { 210, 217, 218, 219 }, { 211, 211, 211, 211 }, { 215, 220, 221, 222, } },
{ { 204, 204, 204, 204 }, { 219, 224, 225, 226 }, { 211, 211, 211, 211 }, { 222, 227, 228, 229, } },
{ { 204, 204, 204, 204 }, { 226, 230, 231, 207 }, { 211, 211, 211, 211 }, { 229, 232, 233, 212, } },
{ { 212, 213, 214, 215 }, { 234, 235, 236, 237 }, { 238, 239, 240, 241 }, { 242, 243, 244, 245, } },
{ { 215, 220, 221, 222 }, { 237, 246, 247, 248 }, { 241, 249, 250, 251 }, { 245, 252, 253, 254, } },
{ { 222, 227, 228, 229 }, { 248, 255, 256, 257 }, { 251, 258, 259, 260 }, { 254, 261, 262, 263, } },
{ { 229, 232, 233, 212 }, { 257, 264, 265, 234 }, { 260, 266, 267, 238 }, { 263, 268, 269, 242, } },
// no bottom!
};
#define RESU 10
#define RESV 10
struct vertex view16_teapot_vertices[TEAPOT_NB_PATCHES * RESU*RESV];
GLfloat view16_teapot_colors[TEAPOT_NB_PATCHES * RESU*RESV * 3];
GLushort view16_teapot_elements[TEAPOT_NB_PATCHES * (RESU-1)*(RESV-1) * 2*3];
GLfloat view16_teapot_cp_colors[269*3];
GLushort view16_teapot_cp_elements[TEAPOT_NB_PATCHES][ORDER+1][ORDER+1];
void build_control_points_k(int p, struct vertex control_points_k[][ORDER+1])
{
for (int i = 0; i <= ORDER; i++) {
for (int j = 0; j <= ORDER; j++) {
control_points_k[i][j] =
view16_teapot_cp_vertices[view16_teapot_patches[p][i][j] - 1];
}
}
}
int factorial(int n)
{
assert(n >= 0);
int result = 1;
for (int i = n; i > 1; i--)
result *= i;
return result;
}
float binomial_coefficient(int i, int n)
{
assert(i >= 0); assert(n >= 0);
return 1.0f * factorial(n) / (factorial(i) * factorial(n-i));
}
float bernstein_polynomial(int i, int n, float u)
{
return binomial_coefficient(i, n) * powf(u, i) * powf(1-u, n-i);
}
struct vertex compute_position(struct vertex control_points_k[][ORDER+1],
float u, float v)
{
struct vertex result = { 0.0, 0.0, 0.0 };
for (int i = 0; i <= ORDER; i++) {
float poly_i = bernstein_polynomial(i, ORDER, u);
for (int j = 0; j <= ORDER; j++) {
float poly_j = bernstein_polynomial(j, ORDER, v);
result.x += poly_i * poly_j * control_points_k[i][j].x;
result.y += poly_i * poly_j * control_points_k[i][j].y;
result.z += poly_i * poly_j * control_points_k[i][j].z;
}
}
return result;
}
void build_teapot()
{
// Vertices
for (int p = 0; p < TEAPOT_NB_PATCHES; p++) {
struct vertex control_points_k[ORDER+1][ORDER+1];
build_control_points_k(p, control_points_k);
for (int ru = 0; ru <= RESU-1; ru++) {
float u = 1.0 * ru / (RESU-1);
for (int rv = 0; rv <= RESV-1; rv++) {
float v = 1.0 * rv / (RESV-1);
view16_teapot_vertices[p*RESU*RESV + ru*RESV + rv] =
compute_position(control_points_k, u, v);
view16_teapot_colors[p*RESU*RESV*3 + ru*RESV*3 + rv*3 + 0] =
1.0 * p / TEAPOT_NB_PATCHES;
view16_teapot_colors[p*RESU*RESV*3 + ru*RESV*3 + rv*3 + 1] =
1.0 * p / TEAPOT_NB_PATCHES;
view16_teapot_colors[p*RESU*RESV*3 + ru*RESV*3 + rv*3 + 2] = 0.8;
}
}
}
// Elements
int n = 0;
for (int p = 0; p < TEAPOT_NB_PATCHES; p++){
for (int ru = 0; ru < RESU-1; ru++) {
for (int rv = 0; rv < RESV-1; rv++) {
// 1 square ABCD = 2 triangles ABC + CDA
// ABC
view16_teapot_elements[n] = p*RESU*RESV + ru *RESV + rv ; n++;
view16_teapot_elements[n] = p*RESU*RESV + ru *RESV + (rv+1); n++;
view16_teapot_elements[n] = p*RESU*RESV + (ru+1)*RESV + (rv+1); n++;
// CDA
view16_teapot_elements[n] = p*RESU*RESV + (ru+1)*RESV + (rv+1); n++;
view16_teapot_elements[n] = p*RESU*RESV + (ru+1)*RESV + rv ; n++;
view16_teapot_elements[n] = p*RESU*RESV + ru *RESV + rv ; n++;
}
}
}
// Control points elements for debugging
memset(view16_teapot_cp_colors, 0, sizeof(view16_teapot_cp_colors));
// black
for (int p = 0; p < TEAPOT_NB_PATCHES; p++) {
for (int i = 0; i < (ORDER+1); i++) {
for (int j = 0; j < (ORDER+1); j++) {
view16_teapot_cp_elements[p][i][j] =
view16_teapot_patches[p][i][j] - 1;
}
}
}
}
int view16_initResources()
{
glEnable(GL_DEPTH_TEST);
glClearColor(1.0, 1.0, 1.0, 0);
build_teapot();
glGenBuffers(1, &view16_vbo_teapot_vertices);
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_vertices);
glBufferData(GL_ARRAY_BUFFER, sizeof(view16_teapot_vertices),
view16_teapot_vertices, GL_STATIC_DRAW);
glGenBuffers(1, &view16_vbo_teapot_colors);
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_colors);
glBufferData(GL_ARRAY_BUFFER, sizeof(view16_teapot_colors),
view16_teapot_colors, GL_STATIC_DRAW);
glGenBuffers(1, &view16_ibo_teapot_elements);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, view16_ibo_teapot_elements);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(view16_teapot_elements),
view16_teapot_elements, GL_STATIC_DRAW);
// ---------------------------------------------
glGenBuffers(1, &view16_vbo_teapot_cp_vertices);
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_cp_vertices);
glBufferData(GL_ARRAY_BUFFER, sizeof(view16_teapot_cp_vertices),
view16_teapot_cp_vertices, GL_STATIC_DRAW);
glGenBuffers(1, &view16_vbo_teapot_cp_colors);
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_cp_colors);
glBufferData(GL_ARRAY_BUFFER, sizeof(view16_teapot_cp_colors),
view16_teapot_cp_colors, GL_STATIC_DRAW);
glGenBuffers(1, &view16_ibo_teapot_cp_elements);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, view16_ibo_teapot_cp_elements);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(view16_teapot_cp_elements),
view16_teapot_cp_elements, GL_STATIC_DRAW);
view16_teapot_program = create_program("glsl/teapot.16.v.glsl",
"glsl/teapot.16.f.glsl");
const char* attribute_name;
attribute_name = "coord3d";
view16_attribute_coord3d = get_attrib(view16_teapot_program,
attribute_name);
attribute_name = "v_color";
view16_attribute_v_color = get_attrib(view16_teapot_program,
attribute_name);
const char* uniform_name;
uniform_name = "mvp";
view16_uniform_mvp = glGetUniformLocation(view16_teapot_program,
uniform_name);
return 0;
}
void view16Idle()
{
// 15° per second
float angle = glutGet(GLUT_ELAPSED_TIME) / 1000.0 * glm::radians(15.0);
glm::mat4 anim =
glm::rotate(glm::mat4(1.0f), 1*angle, glm::vec3(1, 0, 0)) *
glm::rotate(glm::mat4(1.0f), 2*angle, glm::vec3(0, 1, 0)) *
glm::rotate(glm::mat4(1.0f), 3*angle, glm::vec3(0, 0, 1)) *
glm::translate(glm::mat4(1.0f), glm::vec3(0.0, 0.0, -1.5));
glm::mat4 model = glm::mat4(1.0f);
glm::mat4 view = glm::lookAt(glm::vec3(0.0, 0.0, 8.0),
glm::vec3(0.0, 0.0, 0.0),
glm::vec3(0.0, 1.0, 0.0));
glm::mat4 projection =
glm::perspective(45.0f, 1.0f * view16_screen_width/view16_screen_height,
0.1f, 10.0f);
glm::mat4 mvp = projection * view * model * anim;
// cout << glm::to_string(mvp) << endl;
glUseProgram(view16_teapot_program);
glUniformMatrix4fv(view16_uniform_mvp, 1, GL_FALSE, glm::value_ptr(mvp));
glutPostRedisplay();
}
void view16Display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw Teapot
glUseProgram(view16_teapot_program);
glEnableVertexAttribArray(view16_attribute_coord3d);
// Describe our vertices array to OpenGL
// (it can't guess its format automatically)
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_vertices);
glVertexAttribPointer(
view16_attribute_coord3d, // attribute
3, // number of elements per vertex, here (x,y,z)
GL_FLOAT, // the type of each element
GL_FALSE, // take our values as-is
0, // no extra data between each position
0 // offset of first element
);
glEnableVertexAttribArray(view16_attribute_v_color);
// Describe our vertices array to OpenGL
// (it can't guess its format automatically)
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_colors);
glVertexAttribPointer(
view16_attribute_v_color, // attribute
3, // number of elements per vertex, here (x,y,z)
GL_FLOAT, // the type of each element
GL_FALSE, // take our values as-is
0, // no extra data between each position
0 // offset of first element
);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, view16_ibo_teapot_elements);
glDrawElements(GL_TRIANGLES,
sizeof(view16_teapot_elements)/sizeof(view16_teapot_elements[0]),
GL_UNSIGNED_SHORT, 0);
// Draw Control points
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_cp_vertices);
glVertexAttribPointer(
view16_attribute_coord3d, // attribute
3, // number of elements per vertex, here (x,y,z)
GL_FLOAT, // the type of each element
GL_FALSE, // take our values as-is
0, // no extra data between each position
0 // offset of first element
);
// Describe our vertices array to OpenGL
// (it can't guess its format automatically)
glBindBuffer(GL_ARRAY_BUFFER, view16_vbo_teapot_cp_colors);
glVertexAttribPointer(
view16_attribute_v_color, // attribute
3, // number of elements per vertex, here (x,y,z)
GL_FLOAT, // the type of each element
GL_FALSE, // take our values as-is
0, // no extra data between each position
0 // offset of first element
);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, view16_ibo_teapot_cp_elements);
size_t offset = 0;
// size_t instead of GLushort to fix 'warning:
// cast to pointer from integer of different size [-Wint-to-pointer-cast]'
for (int p = 0; p < TEAPOT_NB_PATCHES; p++) {
for (int i = 0; i < ORDER+1;
i++, offset += (ORDER+1)*sizeof(GLushort)) {
glDrawElements(GL_LINE_LOOP, ORDER+1,
GL_UNSIGNED_SHORT, (GLvoid*)offset);
}
}
glDisableVertexAttribArray(view16_attribute_coord3d);
glDisableVertexAttribArray(view16_attribute_v_color);
glutSwapBuffers();
}
// check glStencilFunc
// TODO: the function of glViewport
void view16Reshape(int width, int height)
{
// TODO: why this func be called twice? printf
view16_screen_width = width;
view16_screen_height = height;
// width must equal with height
glViewport(0, 0, width, height);
}
void view16_teapot_freeResources()
{
glDeleteProgram(view16_teapot_program);
glDeleteBuffers(1, &view16_vbo_teapot_vertices);
glDeleteBuffers(1, &view16_vbo_teapot_colors);
glDeleteBuffers(1, &view16_ibo_teapot_elements);
glDeleteBuffers(1, &view16_vbo_teapot_cp_vertices);
glDeleteBuffers(1, &view16_vbo_teapot_cp_colors);
glDeleteBuffers(1, &view16_ibo_teapot_cp_elements);
}
void view16_entry(Window *window)
{
window->display = view16Display;
window->entry = viewEntry;
window->init = view16_initResources;
window->free = view16_teapot_freeResources;
// window->special = view16_special;
window->idle = view16Idle;
window->reshape = view16Reshape;
}
#ifdef TEST_ALONE
int main(int argc, char *argv[])
{
Window window;
resetWindow(&window);
view16_entry(&window);
if (mini_initWindow(argc, argv, &window) == 0){
glutMainLoop();
}
return 0;
}
#endif /* TEST_ALONE */