skcblitz/lighting.h

/*
void light_set_shader(light_t *light, uint id) {
	int pos;
	char str[32];
	pos = sprintf(str, "lights[%d].", id);
	sprintf(str+pos, "position");
	shd_vec3(str, light->pos);
	sprintf(str+pos, "ambient");
	shd_vec3(str, light->ambient);
	sprintf(str+pos, "diffuse");
	shd_vec3(str, light->diffuse);
	sprintf(str+pos, "specular");
	shd_vec3(str, light->specular);
	sprintf(str+pos, "range");
	shd_vec3(str, light->range);
	sprintf(str+pos, "constant");
	shd_float(str, light->constant);
	sprintf(str+pos, "linear");
	shd_float(str, light->linear);
	sprintf(str+pos, "quadratic");
	shd_float(str, light->quadratic);
	sprintf(str+pos, "enabled");
	shd_bool(str, 1);
}

void light_unset_shader(uint id) {
	char str[32];
	sprintf(str, "lights[%d].enabled", id);
	shd_bool(str, 0);
}
*/

void light_calc(world_t *world) {
	int x1 = ((int)world->camera.pos_x) / CHUNK_SIZE;
	int y1 = ((int)world->camera.pos_y) / CHUNK_SIZE;
	int z1 = ((int)world->camera.pos_z) / CHUNK_SIZE;
	int x2 = x1 + gdr.light_dist_chunk;
	int y2 = y1 + gdr.light_dist_chunk;
	int z2 = z1 + gdr.light_dist_chunk;
	ulong pos;
	chunk_t *chunk;
	light_t *light;
	x1 -= gdr.light_dist_chunk;
	y1 -= gdr.light_dist_chunk;
	z1 -= gdr.light_dist_chunk;
	// x1 = CHUNK_CLAMP(world, x1, x);
	// y1 = CHUNK_CLAMP(world, y1, y);
	// z1 = CHUNK_CLAMP(world, z1, z);
	// x2 = CHUNK_CLAMP(world, x2, x);
	// y2 = CHUNK_CLAMP(world, y2, y);
	// z2 = CHUNK_CLAMP(world, z2, z);
	// glBufferData(GL_UNIFORM_BUFFER, sizeof(float) * 18 * gdr.light_max, NULL, GL_DYNAMIC_DRAW);
	// memset(world->lights, 0, sizeof(light_t) * gdr.light_max);
	world->s_lights = 0;
	if(!gdr.light_max)
		return;
	glBindBuffer(GL_UNIFORM_BUFFER, world->light_buf);
	for(int cx = x1; cx <= x2; cx++) {
		for(int cz = z1; cz <= z2; cz++) {
			for(int cy = y1; cy <= y2; cy++) {
				if(!(chunk = chunk_get(world, cx, cy, cz, 0)))
					continue;
				pos = 0;
				while(light = tbl_iter(&chunk->light_table, &pos)) {
					// if(nndist) {
					// if(light_add(world, light) == 0xffffffff)
						// return;
					glBufferSubData(GL_UNIFORM_BUFFER, LIGHT_SSIZE * world->s_lights, LIGHT_SSIZE, light);
					// memcpy(&world->lights[world->s_lights], light, sizeof(shdlight_t));
					if((world->s_lights += 1) >= gdr.light_max) {
						glBindBuffer(GL_UNIFORM_BUFFER, 0);
						return;
					}
					// }
				}
			}
		}
	}
	glBindBuffer(GL_UNIFORM_BUFFER, 0);
}

/*
uint light_add(float x, float y, float z, uint color) {
	light_t *light;
	uint id;
	if(!(world->lights))
		return 0xffffffff;
	if((id = lst_push(&world->light_list)) == 0xffffffff)
		return 0xffffffff;
	light = &world->lights[id];
	light_init_def(light, x, y, z, color);
	shd_sel(gdr.shd_world, 0);
	light_set_shader(light, id);
	world->s_lights += 1;
	shd_int("n_lights", world->s_lights);
	logd("TST", "l %d @ %.3f %.3f %.3f: %06x, %.1f %.1f %.1f", id, x, y, z, color, light->diffuse[0], light->diffuse[1], light->diffuse[2]);
	return id;
}
*/

// void light_remove(world_t *world, uint id) {
	// lst_pop(&world->light_list, id);
	// shd_sel(gdr.shd_world, world);
	// glBindBuffer(GL_UNIFORM_BUFFER, world->light_buf);
	// light_unset_shader(id);
	// world->s_lights -= 1;
	// shd_int("n_lights", world->s_lights);
// }

// void light_refresh() {
	// if(world->world)
		// light_calc(world->world);
	// /*
	// for(int z = 0; z < gdr.light_max; z++) {
		// light_add(((float)(rand() % 20000)) / 100.0f - 100.0f, 1.0f, ((float)(rand() % 20000)) / 100.0f - 100.0f, (rand() % 0xffffff) | 0x404040);
	// }
	// */
// }

// void light_end(world_t *world) {
	// if(world->lights) {
		// mem_free(world->lights);
		// world->lights = NULL;
	// }
// }

// void light_init(world_t *world) {
	// light_end(world);
	// if(gdr.light_max)
		// world->lights = mem_alloc(sizeof(light_t) * gdr.light_max, MEM_LIGHTS);
	// light_calc(world);
// }

void light_setup(int max) {
	window_t *win;
	gdr.light_max = max;
	shd_refresh();
	for(win = wcf.window_list; win; win = win->next) {
		if(win->world) {
			glNamedBufferData(win->world->light_buf, LIGHT_SSIZE * gdr.light_max, NULL, GL_DYNAMIC_DRAW);
			light_calc(win->world);
		}
	}
}

/*
void light_map_fill(const float *polys, int n_polys, uint color, float fog) {
	buf_data(gdr.buf_lightmap, polys, n_polys * 3);
	glBindVertexArray(gdr.vao_lightmap);
	shd_sel(gdr.shd_lightmap, 1);
	shd_vec2v("size", (float)(TEMP_LM_SIZE * CHUNK_SIZE), (float)(TEMP_LM_SIZE * CHUNK_SIZE));
	shd_scolor("color", color);
	shd_float("fog", fog);
	glBindFramebuffer(GL_FRAMEBUFFER, gdr.fb_lightmap);
	glViewport(0, 0, TEMP_LM_SIZE * CHUNK_SIZE, TEMP_LM_SIZE * CHUNK_SIZE);
	glDisable(GL_DEPTH_TEST);
	glDisable(GL_BLEND);
	glDrawArrays(GL_TRIANGLES, 0, n_polys * 3);
	glEnable(GL_BLEND);
	glViewport(0, 0, wcf.current->fb_x, wcf.current->fb_y);
	buf_data(gdr.buf_lightmap, NULL, 0);
}

void light_map_rect(int x1, int z1, int x2, int z2, uint color, float fog) {
	x2 -= x1;
	z2 -= z1;
	x1 += (CHUNK_SIZE * (TEMP_LM_SIZE / 2));
	z1 += (CHUNK_SIZE * (TEMP_LM_SIZE / 2));
	glBindFramebuffer(GL_FRAMEBUFFER, gdr.fb_lightmap);
	glClearColor(
		(float)((uint)((color >> 16) & 0xff)) / 255.0f,
		(float)((uint)((color >> 8) & 0xff)) / 255.0f,
		(float)((uint)(color & 0xff)) / 255.0f,
	fog);
	glViewport(0, 0, TEMP_LM_SIZE * CHUNK_SIZE, TEMP_LM_SIZE * CHUNK_SIZE);
	glScissor(x1, z1, x2, z2);
	// logd(LOG_SYS, "n %d %d %d %d", x1, z1, x2, z2);
	glEnable(GL_SCISSOR_TEST);
	glClear(GL_COLOR_BUFFER_BIT);
	glDisable(GL_SCISSOR_TEST);
	glViewport(0, 0, wcf.current->fb_x, wcf.current->fb_y);
}

void light_map_clear() {
	fb_size(gdr.fbt_lightmap, TEMP_LM_SIZE * CHUNK_SIZE, TEMP_LM_SIZE * CHUNK_SIZE);
	glBindFramebuffer(GL_FRAMEBUFFER, gdr.fb_lightmap);
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glClear(GL_COLOR_BUFFER_BIT);
}
*/

void light_init_base(light_t *light, light_b *lamp) {
	float r = (float)((uint)((lamp->color >> 16) & 0xff)) / 255.0f;
	float g = (float)((uint)((lamp->color >> 8) & 0xff)) / 255.0f; 
	float b = (float)((uint)(lamp->color & 0xff)) / 255.0f;
	VEC3_SET(light->ambient, r * lamp->amb_fact, g * lamp->amb_fact, b * lamp->amb_fact);
	VEC3_SET(light->diffuse, r * lamp->dif_fact, g * lamp->dif_fact, b * lamp->dif_fact);
	VEC3_SET(light->specular, r, g, b);
	VEC3_SET(light->range, lamp->range_xz, lamp->range_y, lamp->range_xz);
	light->constant = lamp->constant;
	light->linear = lamp->linear;
	light->quadratic = lamp->quadratic;
}

void light_init_def(light_b *light, uint color, float brightness) {
	light->color = color;
	light->amb_fact = brightness;
	light->dif_fact = MIN_VALUE(brightness * 16.0f, 1.0f);
	light->range_xz = 1.0f;
	light->range_y = 1.0f;
	light->constant = 1.0f;
	light->linear = 0.09f;
	light->quadratic = 0.032f;
}