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math functions

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Nishi 2026-01-10 19:51:48 +09:00
commit 9d11089a75
Signed by: nishi
GPG key ID: 27EF69B208EB9343
15 changed files with 265 additions and 47 deletions
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engine/src/gl_camera.c Normal file
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#include <GearBox/GL.h>
#include <GearBox/Math.h>
void GBGLPerspective(GBGL gl, double fovy, double znear, double zfar) {
GLint vp[4];
double aspect;
double f;
GLdouble matrix[16];
int i;
glGetIntegerv(GL_VIEWPORT, vp);
aspect = (double)vp[2] / vp[3];
f = GBMathCot(fovy / 180 * GBMathPi / 2);
for(i = 0; i < 16; i++) matrix[i] = 0;
matrix[4 * 0 + 0] = f / aspect;
matrix[4 * 1 + 1] = f;
matrix[4 * 2 + 2] = (zfar + znear) / (znear - zfar);
matrix[4 * 3 + 2] = ((double)2 * zfar * znear) / (znear - zfar);
matrix[4 * 2 + 3] = -1;
glLoadIdentity();
glLoadMatrixd(matrix);
}
void GBGLSetCamera(GBGL gl) {
GLdouble matrix[16];
GBVector3 f;
GBVector3 up;
GBVector3 s;
GBVector3 u;
int i;
GBMathSubtract3(f, gl->engine->client->look_at, gl->engine->client->camera);
GBMathNormalize3(f);
up[0] = 0;
up[1] = 1;
up[2] = 0;
GBMathNormalize3(up);
GBMathCross3(s, f, up);
GBMathNormalize3(s);
GBMathCross3(u, s, f);
for(i = 0; i < 16; i++) matrix[i] = 0;
matrix[4 * 0 + 0] = s[0];
matrix[4 * 1 + 0] = s[1];
matrix[4 * 2 + 0] = s[2];
matrix[4 * 0 + 1] = u[0];
matrix[4 * 1 + 1] = u[1];
matrix[4 * 2 + 1] = u[2];
matrix[4 * 0 + 2] = -f[0];
matrix[4 * 1 + 2] = -f[1];
matrix[4 * 2 + 2] = -f[2];
matrix[4 * 3 + 3] = 1;
glLoadIdentity();
glLoadMatrixd(matrix);
glTranslated(-gl->engine->client->camera[0], -gl->engine->client->camera[1], -gl->engine->client->camera[2]);
}