nuclear@0: #include <stdio.h>
nuclear@0: #include <string.h>
nuclear@5: #include "opengl.h"
nuclear@0: #include "vr.h"
nuclear@0: #include "vr_impl.h"
nuclear@0: #include "mathutil.h"
nuclear@0: 
nuclear@0: 
nuclear@5: static void fallback_present(void);
nuclear@0: 
nuclear@0: 
nuclear@0: static struct vr_module *vrm;
nuclear@0: static float idmat[] = {
nuclear@0: 	1, 0, 0, 0,
nuclear@0: 	0, 1, 0, 0,
nuclear@0: 	0, 0, 1, 0,
nuclear@0: 	0, 0, 0, 1
nuclear@0: };
nuclear@0: static float fbtex_rect[] = {
nuclear@0: 	0, 0, 1, 1
nuclear@0: };
nuclear@0: 
nuclear@5: static void *defopt;	/* default options db */
nuclear@5: 
nuclear@5: static struct {
nuclear@5: 	float umin, umax, vmin, vmax;
nuclear@5: 	int tex;
nuclear@5: } rtarg[2];
nuclear@5: 
nuclear@5: 
nuclear@0: int vr_init(void)
nuclear@0: {
nuclear@0: 	int i, nmodules;
nuclear@0: 
nuclear@5: 	/* create the default options database */
nuclear@5: 	if(!defopt && (defopt = create_options())) {
nuclear@5: 		set_option_float(defopt, VR_OPT_EYE_HEIGHT, 1.675);
nuclear@5: 		set_option_float(defopt, VR_OPT_IPD, 0.064);
nuclear@5: 	}
nuclear@5: 
nuclear@0: 	if(vrm) {
nuclear@0: 		vr_shutdown();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	vr_init_modules();
nuclear@0: 
nuclear@0: 	nmodules = vr_get_num_modules();
nuclear@0: 	for(i=0; i<nmodules; i++) {
nuclear@0: 		struct vr_module *m = vr_get_module(i);
nuclear@0: 		if(m->init() != -1) {
nuclear@0: 			/* add to the active modules array */
nuclear@0: 			vr_activate_module(i);
nuclear@0: 			if(!vrm) {
nuclear@0: 				vr_use_module(0);
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!vrm) {
nuclear@0: 		return -1;
nuclear@0: 	}
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_shutdown(void)
nuclear@0: {
nuclear@0: 	vr_clear_modules();
nuclear@0: 	vrm = 0;
nuclear@0: 	fbtex_rect[0] = fbtex_rect[1] = 0;
nuclear@0: 	fbtex_rect[2] = fbtex_rect[3] = 1;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_module_count(void)
nuclear@0: {
nuclear@0: 	return vr_get_num_active_modules();
nuclear@0: }
nuclear@0: 
nuclear@0: const char *vr_module_name(int idx)
nuclear@0: {
nuclear@0: 	struct vr_module *m = vr_get_active_module(idx);
nuclear@0: 	if(!m) {
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: 	return m->name;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_use_module(int idx)
nuclear@0: {
nuclear@0: 	if(idx >= 0 && idx < vr_get_num_active_modules()) {
nuclear@0: 		struct vr_module *m = vr_get_active_module(idx);
nuclear@0: 		if(m != vrm) {
nuclear@0: 			vrm = m;
nuclear@0: 			printf("using vr module: %s\n", vrm->name);
nuclear@0: 		}
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: 	return -1;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_use_module_named(const char *name)
nuclear@0: {
nuclear@0: 	int i, count = vr_get_num_active_modules();
nuclear@0: 
nuclear@0: 	for(i=0; i<count; i++) {
nuclear@0: 		struct vr_module *m = vr_get_active_module(i);
nuclear@0: 		if(strcmp(m->name, name) == 0) {
nuclear@0: 			return vr_use_module(i);
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 	return -1;
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_set_opti(const char *optname, int val)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->set_option) {
nuclear@0: 		vrm->set_option(optname, OTYPE_INT, &val);
nuclear@5: 	} else {
nuclear@5: 		set_option_int(defopt, optname, val);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_set_optf(const char *optname, float val)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->set_option) {
nuclear@0: 		vrm->set_option(optname, OTYPE_FLOAT, &val);
nuclear@5: 	} else {
nuclear@5: 		set_option_float(defopt, optname, val);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_get_opti(const char *optname)
nuclear@0: {
nuclear@0: 	int res = 0;
nuclear@0: 
nuclear@5: 	if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
nuclear@5: 		get_option_int(defopt, optname, &res);	/* fallback */
nuclear@0: 	}
nuclear@0: 	return res;
nuclear@0: }
nuclear@0: 
nuclear@0: float vr_get_optf(const char *optname)
nuclear@0: {
nuclear@0: 	float res = 0.0f;
nuclear@0: 
nuclear@5: 	if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
nuclear@5: 		get_option_float(defopt, optname, &res);	/* fallback */
nuclear@0: 	}
nuclear@0: 	return res;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: int vr_view_translation(int eye, float *vec)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->translation) {
nuclear@0: 		vrm->translation(eye, vec);
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	vec[0] = vec[1] = vec[2] = 0.0f;
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_view_rotation(int eye, float *quat)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->rotation) {
nuclear@0: 		vrm->rotation(eye, quat);
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	quat[0] = quat[1] = quat[2] = 0.0f;
nuclear@0: 	quat[3] = 1.0f;
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_view_matrix(int eye, float *mat)
nuclear@0: {
nuclear@0: 	int have_trans, have_rot;
nuclear@0: 	float offs[3], quat[4];
nuclear@0: 	float rmat[16], tmat[16];
nuclear@0: 
nuclear@0: 	if(vrm && vrm->view_matrix) {
nuclear@0: 		vrm->view_matrix(eye, mat);
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	have_trans = vr_view_translation(eye, offs);
nuclear@0: 	have_rot = vr_view_rotation(eye, quat);
nuclear@0: 
nuclear@0: 	if(!have_trans && !have_rot) {
nuclear@5: 		memcpy(mat, idmat, sizeof idmat);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	offs[0] = -offs[0];
nuclear@0: 	offs[1] = -offs[1];
nuclear@0: 	offs[2] = -offs[2];
nuclear@0: 
nuclear@0: 	translation_matrix(offs, tmat);
nuclear@0: 	rotation_matrix(quat, rmat);
nuclear@0: 	mult_matrix(mat, tmat, rmat);
nuclear@0: 	return 1;
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_proj_matrix(int eye, float znear, float zfar, float *mat)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->proj_matrix) {
nuclear@0: 		vrm->proj_matrix(eye, znear, zfar, mat);
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	memcpy(mat, idmat, sizeof idmat);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_begin(int eye)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->begin) {
nuclear@0: 		vrm->begin(eye);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_end(void)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->end) {
nuclear@0: 		vrm->end();
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: int vr_swap_buffers(void)
nuclear@0: {
nuclear@0: 	int res = 0;
nuclear@0: 
nuclear@0: 	if(vrm && vrm->present) {
nuclear@0: 		res = vrm->present();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!res) {
nuclear@5: 		fallback_present();
nuclear@5: 		vr_gl_swap_buffers();
nuclear@0: 	}
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_output_texture(unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0: {
nuclear@0: 	float halfu = (umax + umin) * 0.5f;
nuclear@0: 
nuclear@0: 	vr_output_texture_eye(VR_EYE_LEFT, tex, umin, vmin, halfu, vmax);
nuclear@0: 	vr_output_texture_eye(VR_EYE_RIGHT, tex, halfu, vmin, umax, vmax);
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_output_texture_eye(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->set_eye_texture) {
nuclear@0: 		vrm->set_eye_texture(eye, tex, umin, vmin, umax, vmax);
nuclear@5: 	} else {
nuclear@5: 		rtarg[eye].tex = tex;
nuclear@5: 		rtarg[eye].umin = umin;
nuclear@5: 		rtarg[eye].umax = umax;
nuclear@5: 		rtarg[eye].vmin = vmin;
nuclear@5: 		rtarg[eye].vmax = vmax;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void vr_recenter(void)
nuclear@0: {
nuclear@0: 	if(vrm && vrm->recenter) {
nuclear@0: 		vrm->recenter();
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@5: static void fallback_present(void)
nuclear@5: {
nuclear@5: 	int i;
nuclear@0: 
nuclear@5: 	glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);
nuclear@0: 
nuclear@5: 	glDisable(GL_LIGHTING);
nuclear@5: 	glDisable(GL_DEPTH_TEST);
nuclear@5: 	glDisable(GL_ALPHA_TEST);
nuclear@5: 	glDisable(GL_STENCIL_TEST);
nuclear@5: 	glDisable(GL_FOG);
nuclear@5: 
nuclear@5: 	glEnable(GL_TEXTURE_2D);
nuclear@5: 
nuclear@5: 	glMatrixMode(GL_MODELVIEW);
nuclear@5: 	glPushMatrix();
nuclear@5: 	glLoadIdentity();
nuclear@5: 	glMatrixMode(GL_PROJECTION);
nuclear@5: 	glPushMatrix();
nuclear@5: 	glLoadIdentity();
nuclear@5: 
nuclear@5: 	for(i=0; i<2; i++) {
nuclear@5: 		float x0 = i == 0 ? -1 : 0;
nuclear@5: 		float x1 = i == 0 ? 0 : 1;
nuclear@5: 
nuclear@5: 		glBindTexture(GL_TEXTURE_2D, rtarg[i].tex);
nuclear@5: 
nuclear@5: 		glBegin(GL_QUADS);
nuclear@5: 		glTexCoord2f(rtarg[i].umin, rtarg[i].vmin);
nuclear@5: 		glVertex2f(x0, -1);
nuclear@5: 		glTexCoord2f(rtarg[i].umax, rtarg[i].vmin);
nuclear@5: 		glVertex2f(x1, -1);
nuclear@5: 		glTexCoord2f(rtarg[i].umax, rtarg[i].vmax);
nuclear@5: 		glVertex2f(x1, 1);
nuclear@5: 		glTexCoord2f(rtarg[i].umin, rtarg[i].vmax);
nuclear@5: 		glVertex2f(x0, 1);
nuclear@5: 		glEnd();
nuclear@5: 	}
nuclear@5: 
nuclear@5: 	glPopMatrix();
nuclear@5: 	glMatrixMode(GL_MODELVIEW);
nuclear@5: 	glPopMatrix();
nuclear@5: 
nuclear@5: 	glPopAttrib();
nuclear@0: }