add projbase to repo

1 files changed, 45 insertions, 0 deletions

diff --git a/project-base/src/camera.c b/project-base/src/camera.c
new file mode 100644
index 0000000..73a4790
--- /dev/null
+++ b/project-base/src/camera.c
@@ -0,0 +1,45 @@
+/* 
+*  BSD 2-Clause “Simplified” License
+*  Copyright (c) 2019, Aldrik Ramaekers, aldrik.ramaekers@protonmail.com
+*  All rights reserved.
+*/
+
+void _camera_apply_transformations(platform_window *window, camera *camera)
+{
+	s32 x = (window->width/2)+(camera->x);
+	s32 y =  (window->height/2)+(camera->y);
+	IMP_glTranslatef(x, y, 0.0f);
+	IMP_glRotatef(camera->rotation, 0.0f, 0.0f, 1.0f);
+	IMP_glTranslatef(-x, -y, 0.0f);
+	
+	IMP_glMatrixMode(GL_PROJECTION);
+	IMP_glLoadIdentity();
+    
+    IMP_glOrtho(camera->x, window->width+camera->x, 
+            window->height+camera->y, camera->y, -100, 100);
+    
+	IMP_glMatrixMode(GL_MODELVIEW);
+}
+
+vec4 camera_get_target_rectangle(platform_window *window)
+{
+	int w = window->width;
+	int h = window->height;
+
+	double targetRatio = 16.0 / 9.0;
+	double ratio = (double)w / h;
+	if (ratio < targetRatio) // Too much height
+	{
+		int newHeight = (int)(w / targetRatio);
+		int newY = (h - newHeight) / 2;
+		return (vec4){0, newY, w, newHeight};
+	}
+	else if (ratio > targetRatio) // Too much width
+	{
+		int newWidth = (int)(h * targetRatio);
+		int newX = (w - newWidth) / 2;
+		return (vec4){newX, 0, newWidth, h};
+	}
+
+	return (vec4){0,0,w,h};
+}
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