#include "tinygl/zgl.h"

GLContext *gl_ctx;

void initSharedState(GLContext *c) {
	GLSharedState *s = &c->shared_state;
	s->lists = (GLList **)gl_zalloc(sizeof(GLList *) * MAX_DISPLAY_LISTS);
	s->texture_hash_table = (GLTexture **)gl_zalloc(sizeof(GLTexture *) * TEXTURE_HASH_TABLE_SIZE);

	alloc_texture(c, 0);
}

void endSharedState(GLContext *c) {
	GLSharedState *s = &c->shared_state;
	int i;

	for (i = 0; i< MAX_DISPLAY_LISTS; i++) {
		// TODO
	}
	gl_free(s->lists);

	gl_free(s->texture_hash_table);
}

void tglInit(void *zbuffer1) {
	ZBuffer *zbuffer = (ZBuffer *)zbuffer1;
	GLContext *c;
	GLViewport *v;
	int i;

	c = (GLContext *)gl_zalloc(sizeof(GLContext));
	gl_ctx = c;

	c->zb = zbuffer;

	// allocate GLVertex array
	c->vertex_max = POLYGON_MAX_VERTEX;
	c->vertex = (GLVertex *)gl_malloc(POLYGON_MAX_VERTEX * sizeof(GLVertex));
  
	// viewport
	v = &c->viewport;
	v->xmin = 0;
	v->ymin = 0;
	v->xsize = zbuffer->xsize;
	v->ysize = zbuffer->ysize;
	v->updated = 1;

	// shared state
	initSharedState(c);

	// lists

	c->exec_flag = 1;
	c->compile_flag = 0;
	c->print_flag = 0;

	c->in_begin=0;

	// lights
	for (i = 0; i < MAX_LIGHTS; i++) {
		GLLight *l = &c->lights[i];
		l->ambient = gl_V4_New(0, 0, 0, 1);
		l->diffuse = gl_V4_New(1, 1, 1, 1);
		l->specular = gl_V4_New(1, 1, 1, 1);
		l->position = gl_V4_New(0, 0, 1, 0);
		l->norm_position = gl_V3_New(0, 0, 1);
		l->spot_direction = gl_V3_New(0, 0, -1);
		l->norm_spot_direction = gl_V3_New(0, 0,- 1);
		l->spot_exponent = 0;
		l->spot_cutoff = 180;
		l->attenuation[0] = 1;
		l->attenuation[1] = 0;
		l->attenuation[2] = 0;
		l->enabled = 0;
	}
	c->first_light=NULL;
	c->ambient_light_model=gl_V4_New(0.2f,0.2f,0.2f,1);
	c->local_light_model=0;
	c->lighting_enabled=0;
	c->light_model_two_side = 0;

	// default materials */
	for (i = 0; i < 2; i++) {
		GLMaterial *m = &c->materials[i];
		m->emission = gl_V4_New(0, 0, 0, 1);
		m->ambient = gl_V4_New(0.2f, 0.2f, 0.2f, 1);
		m->diffuse = (gl_V4_New(0.8f, 0.8f, 0.8f, 1));
		m->specular = gl_V4_New(0, 0, 0, 1);
		m->shininess = 0;
	}
	c->current_color_material_mode = TGL_FRONT_AND_BACK;
	c->current_color_material_type = TGL_AMBIENT_AND_DIFFUSE;
	c->color_material_enabled = 0;

	// textures
	glInitTextures(c);

	// default state
	c->current_color.X = 1.0;
	c->current_color.Y = 1.0;
	c->current_color.Z = 1.0;
	c->current_color.W = 1.0;
	c->longcurrent_color[0] = 65535;
	c->longcurrent_color[1] = 65535;
	c->longcurrent_color[2] = 65535;

	c->current_normal.X = 1.0;
	c->current_normal.Y = 0.0;
	c->current_normal.Z = 0.0;
	c->current_normal.W = 0.0;

	c->current_edge_flag = 1;

	c->current_tex_coord.X = 0;
	c->current_tex_coord.Y = 0;
	c->current_tex_coord.Z = 0;
	c->current_tex_coord.W = 1;

	c->polygon_mode_front = TGL_FILL;
	c->polygon_mode_back = TGL_FILL;

	c->current_front_face = 0; // 0 = GL_CCW  1 = GL_CW
	c->current_cull_face = TGL_BACK;
	c->current_shade_model = TGL_SMOOTH;
	c->cull_face_enabled = 0;
  
	// clear
	c->clear_color.v[0] = 0;
	c->clear_color.v[1] = 0;
	c->clear_color.v[2] = 0;
	c->clear_color.v[3] = 0;
	c->clear_depth = 0;

	// selection
	c->render_mode = TGL_RENDER;
	c->select_buffer = NULL;
	c->name_stack_size = 0;

	// matrix
	c->matrix_mode = 0;
  
	c->matrix_stack_depth_max[0] = MAX_MODELVIEW_STACK_DEPTH;
	c->matrix_stack_depth_max[1] = MAX_PROJECTION_STACK_DEPTH;
	c->matrix_stack_depth_max[2] = MAX_TEXTURE_STACK_DEPTH;

	for (i = 0; i < 3; i++) {
		c->matrix_stack[i] = (M4 *)gl_zalloc(c->matrix_stack_depth_max[i] * sizeof(M4));
		c->matrix_stack_ptr[i] = c->matrix_stack[i];
	}

	tglMatrixMode(TGL_PROJECTION);
	tglLoadIdentity();
	tglMatrixMode(TGL_TEXTURE);
	tglLoadIdentity();
	tglMatrixMode(TGL_MODELVIEW);
	tglLoadIdentity();

	c->matrix_model_projection_updated = 1;

	// opengl 1.1 arrays
	c->client_states = 0;

	// opengl 1.1 polygon offset
	c->offset_states = 0;

	// clear the resize callback function pointer
	c->gl_resize_viewport = NULL;

	// specular buffer
	c->specbuf_first = NULL;
	c->specbuf_used_counter = 0;
	c->specbuf_num_buffers = 0;

	// depth test
	c->depth_test = 0;
}

void tglClose() {
	GLContext *c = gl_get_context();
	endSharedState(c);
	gl_free(c);
}