1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
/* ----------------------------------------------------------------------------
* camera2d.cpp
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
* See file LICENSE for more details
* ----------------------------------------------------------------------------
*/
#include "camera2d.hpp"
#include <GL/glew.h>
namespace yage {
Camera2D::Camera2D(int screen_width, int screen_height)
: position_(0.f, 0.f),
camera_matrix_(1.f),
ortho_matrix_(
glm::ortho(0.f, (float)screen_width, 0.f, (float)screen_height)) {}
void Camera2D::update(GlslProgram& program) {
if (matrix_needs_update_) {
glm::vec3 translate(-position_.x, -position_.y, 0.f);
glm::vec3 scale(scale_, scale_, 0.f);
camera_matrix_ = glm::translate(ortho_matrix_, translate);
camera_matrix_ = glm::scale(glm::mat4(1.f), scale) * camera_matrix_;
matrix_needs_update_ = false;
}
GLint matrix_location = program.getUniformLocation("P");
glUniformMatrix4fv(matrix_location, 1, GL_FALSE, &(camera_matrix_[0][0]));
}
void Camera2D::move(const glm::vec2& direction) {
position_ += direction;
matrix_needs_update_ = true;
}
} // yage
|
