manigraph/src/input.c

#include "main.h"
#include <GLFW/glfw3.h>
#include <cglm/quat.h>
#include <stdio.h>

#define ANGLE ((float)0x01 / 0xff * 2 * GLM_PI)

unsigned char selected_axis = 0;
int window_width;
int window_height;

unsigned char animate_index=0;

versor q = GLM_QUAT_IDENTITY_INIT;

vec3 axis[3] = {
	{1, 0, 0},
	{0, 1, 0},
	{0, 0, 1},
};

extern struct projection projection;

void __key_callback_input(
	GLFWwindow *window, int key, int scancode, int action, int mods)
{
	if (action != GLFW_PRESS)
		return;

	if (GLFW_KEY_0 < key && key <= GLFW_KEY_9)
	{
		unsigned char selected_coord;

		selected_coord = key - GLFW_KEY_0 - 1;

		if (selected_coord >= projection.m)
			return;
		if (selected_coord == projection.x)
			return;
		if (selected_coord == projection.y)
			return;
		if (selected_coord == projection.z)
			return;

		selected_coord = projection.w;
	}

	if (projection.w >= projection.m)
		return;

	switch (key)
	{
		unsigned char tmp;
	case GLFW_KEY_I:
		tmp = projection.w;
		projection.w = projection.x;
		projection.x = tmp;

		animate_index=1;
		break;
	case GLFW_KEY_O:
		tmp = projection.w;
		projection.w = projection.y;
		projection.y = tmp;
		animate_index=2;
		break;
	case GLFW_KEY_P:
		tmp = projection.w;
		projection.w = projection.z;
		projection.z = tmp;
		animate_index=3;
		break;
	}


	return;
}

void __window_callback_input(GLFWwindow *window, int w, int h)
{
	int m;

	m = (w < h) ? w : h;
	window_width = w;
	window_height = h;

	glViewport((w - m) / 2, (h - m) / 2, m, m);
}

void __mouse_callback_input(
	GLFWwindow *window, int button, int action, int mods)
{
	unsigned char green_value;
	double xpos, ypos;

	if (button != GLFW_MOUSE_BUTTON_LEFT || action != GLFW_PRESS)
		return;

	glfwGetCursorPos(window, &xpos, &ypos);
	glReadPixels((int)xpos, (int)(window_height - ypos), 1, 1, GL_GREEN,
		GL_UNSIGNED_BYTE, &green_value);

	switch (green_value)
	{
	case 0xD3:
	case 0xD4:
	case 0xD5:
		selected_axis = green_value - 0xD3;
	}
}

void __scroll_callback_input(GLFWwindow *window, double xoffset, double yoffset)
{
	versor p = GLM_QUAT_IDENTITY_INIT;
	versor r = GLM_QUAT_IDENTITY_INIT;

	//glm_quatv(p, yoffset * ANGLE, axis[selected_axis]);
	glm_quatv(p, yoffset * ANGLE * 2, (vec3){-1,0,0});
	glm_quatv(r, xoffset * ANGLE * 2, (vec3){0,1,0});
	glm_quat_mul(p, q, q);
	glm_quat_mul(r, q, q);

	glm_quat_rotatev(p, axis[0], axis[0]);
	glm_quat_rotatev(p, axis[1], axis[1]);
	glm_quat_rotatev(p, axis[2], axis[2]);

	glm_quat_rotatev(r, axis[0], axis[0]);
	glm_quat_rotatev(r, axis[1], axis[1]);
	glm_quat_rotatev(r, axis[2], axis[2]);
}

quat_t poll_input(window_t window)
{
	versor p = GLM_QUAT_IDENTITY_INIT;

	if (glfwGetKey((GLFWwindow *)window, 'Q') == GLFW_PRESS)
	{
		glm_quatv(p, ANGLE, axis[0]);
		goto end;
	}
	if (glfwGetKey((GLFWwindow *)window, 'W') == GLFW_PRESS)
	{
		glm_quatv(p, -ANGLE, axis[0]);
		goto end;
	}
	if (glfwGetKey((GLFWwindow *)window, 'A') == GLFW_PRESS)
	{
		glm_quatv(p, ANGLE, axis[1]);
		goto end;
	}
	if (glfwGetKey((GLFWwindow *)window, 'S') == GLFW_PRESS)
	{
		glm_quatv(p, -ANGLE, axis[1]);
		goto end;
	}
	if (glfwGetKey((GLFWwindow *)window, 'Z') == GLFW_PRESS)
	{
		glm_quatv(p, ANGLE, axis[2]);
		goto end;
	}
	if (glfwGetKey((GLFWwindow *)window, 'X') == GLFW_PRESS)
	{
		glm_quatv(p, -ANGLE, axis[2]);
		goto end;
	}

end:
	glm_quat_mul(p, q, q);
	glm_quat_rotatev(p, axis[0], axis[0]);
	glm_quat_rotatev(p, axis[1], axis[1]);
	glm_quat_rotatev(p, axis[2], axis[2]);
	glm_quat_normalize(q);

	// LOG INFO
	if(0)
	{
		printf("QUAT: %2.5f %2.5f %2.5f %2.5f\n", q[0], q[1], q[2], q[3]);
		printf("PROY: %3d %3d %3d (%3d)\n", projection.x, projection.y, projection.z, projection.w );
		printf("\n");
	}
	return q;
}