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/*
Copyright 2012-2019 David Robillard <d@drobilla.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef PUGL_DEMO_UTILS_H
#define PUGL_DEMO_UTILS_H
#include "pugl/pugl.h"
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
typedef struct {
double lastReportTime;
} PuglFpsPrinter;
typedef float vec4[4];
typedef vec4 mat4[4];
static inline void
mat4Identity(mat4 m)
{
for (int c = 0; c < 4; ++c) {
for (int r = 0; r < 4; ++r) {
m[c][r] = c == r ? 1.0f : 0.0f;
}
}
}
static inline void
mat4Translate(mat4 m, const float x, const float y, const float z)
{
m[3][0] = x;
m[3][1] = y;
m[3][2] = z;
}
static inline void
mat4Mul(mat4 m, mat4 a, mat4 b)
{
for (int c = 0; c < 4; ++c) {
for (int r = 0; r < 4; ++r) {
m[c][r] = 0.0f;
for (int k = 0; k < 4; ++k) {
m[c][r] += a[k][r] * b[c][k];
}
}
}
}
static inline void
mat4Ortho(mat4 m,
const float l,
const float r,
const float b,
const float t,
const float n,
const float f)
{
m[0][0] = 2.0f / (r - l);
m[0][1] = m[0][2] = m[0][3] = 0.0f;
m[1][1] = 2.0f / (t - b);
m[1][0] = m[1][2] = m[1][3] = 0.0f;
m[2][2] = -2.0f / (f - n);
m[2][0] = m[2][1] = m[2][3] = 0.0f;
m[3][0] = -(r + l) / (r - l);
m[3][1] = -(t + b) / (t - b);
m[3][2] = -(f + n) / (f - n);
m[3][3] = 1.0f;
}
/// Calculate a projection matrix for a given perspective
static inline void
perspective(float* m, float fov, float aspect, float zNear, float zFar)
{
const float h = tanf(fov);
const float w = h / aspect;
const float depth = zNear - zFar;
const float q = (zFar + zNear) / depth;
const float qn = 2 * zFar * zNear / depth;
// clang-format off
m[0] = w; m[1] = 0; m[2] = 0; m[3] = 0;
m[4] = 0; m[5] = h; m[6] = 0; m[7] = 0;
m[8] = 0; m[9] = 0; m[10] = q; m[11] = -1;
m[12] = 0; m[13] = 0; m[14] = qn; m[15] = 0;
// clang-format on
}
static inline void
puglPrintFps(const PuglWorld* world,
PuglFpsPrinter* printer,
unsigned* const framesDrawn)
{
const double thisTime = puglGetTime(world);
if (thisTime > printer->lastReportTime + 5) {
const double fps = *framesDrawn / (thisTime - printer->lastReportTime);
fprintf(stderr,
"FPS: %.2f (%u frames in %.0f seconds)\n",
fps,
*framesDrawn,
thisTime - printer->lastReportTime);
printer->lastReportTime = thisTime;
*framesDrawn = 0;
}
}
#endif // PUGL_DEMO_UTILS_H
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