// Copyright 2012-2019 David Robillard <d@drobilla.net> // SPDX-License-Identifier: ISC #ifndef EXAMPLES_DEMO_UTILS_H #define EXAMPLES_DEMO_UTILS_H #include "pugl/pugl.h" #include <math.h> #include <stdio.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 // EXAMPLES_DEMO_UTILS_H