void matrix_set_scaling(float *m, float x_scale, float y_scale, float z_scale) { matrix_identity4x4(m); m[0] = x_scale; m[5] = y_scale; m[10] = z_scale; }
void matrix_init_orthographic(float *m, float left, float right, float bottom, float top, float near, float far) { float mo[4*4], mp[4*4]; mo[0x0] = 2.0f/(right-left); mo[0x1] = 0.0f; mo[0x2] = 0.0f; mo[0x3] = -(right+left)/(right-left); mo[0x4] = 0.0f; mo[0x5] = 2.0f/(top-bottom); mo[0x6] = 0.0f; mo[0x7] = -(top+bottom)/(top-bottom); mo[0x8] = 0.0f; mo[0x9] = 0.0f; mo[0xA] = -2.0f/(far-near); mo[0xB] = (far+near)/(far-near); mo[0xC] = 0.0f; mo[0xD] = 0.0f; mo[0xE] = 0.0f; mo[0xF] = 1.0f; matrix_identity4x4(mp); mp[0xA] = 0.5; mp[0xB] = -0.5; //Convert Z [-1, 1] to [-1, 0] (PICA shiz) matrix_mult4x4(mp, mo, m); // Rotate 180 degrees matrix_rotate_z(m, M_PI); // Swap X and Y axis matrix_swap_xy(m); }
void matrix_set_xyz_translation(float *m, float x, float y, float z) { matrix_identity4x4(m); m[12] = x; m[13] = y; m[14] = z; }
void matrix_set_z_rotation(float *m, float rad) { float c = cosf(rad); float s = sinf(rad); matrix_identity4x4(m); m[0] = c; m[1] = -s; m[4] = s; m[5] = c; }
void matrix_swap_xy(float *m) { float ms[4*4], mt[4*4]; matrix_identity4x4(ms); ms[0] = 0.0f; ms[1] = 1.0f; ms[4] = 1.0f; ms[5] = 0.0f; matrix_mult4x4(ms, m, mt); matrix_copy(m, mt); }