clean up uniform init/update code + fix window resizing

1 files changed, 40 insertions, 0 deletions

diff --git a/uniform.c b/uniform.c
new file mode 100644
index 0000000..6c66b7a
--- /dev/null
+++ b/uniform.c
@@ -0,0 +1,40 @@
+#include <sys/time.h>
+#include <time.h>
+#include <GL/glew.h>
+
+#include "uniform.h"
+
+int time_start = 0;
+GLFWwindow* window = NULL;
+GLint u_time, u_window;
+
+void init_uniform(GLuint shader, GLFWwindow* _window) {
+	window = _window;
+
+	u_time = glGetUniformLocation(shader, "time");
+	u_window = glGetUniformLocation(shader, "window");
+
+	time_start = time(NULL);
+}
+
+/** @brief update `uniform float time` */
+static void update_u_time() {
+	struct timeval t;
+	gettimeofday(&t, NULL);
+	t.tv_sec -= time_start;
+	float time = t.tv_sec + (t.tv_usec / 1e6);
+	glUniform1f(u_time, time);
+}
+
+/** @brief update `uniform ivec2 window` */
+static void update_u_window() {
+	int width, height;
+	glfwGetWindowSize(window, &width, &height);
+	glUniform2i(u_window, width, height);
+}
+
+void update_uniform() {
+	update_u_time();
+	update_u_window();
+}
+