Fixed camera

src/display/camera.c

@@ -98,6 +98,34 @@ void cameraPushMatrix(camera_t *camera) {
       );
       break;
 
+    case CAMERA_VIEW_TYPE_LOOKAT_PIXEL_PERFECT:
+      assertTrue(
+        camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE ||
+        camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED,
+        "Pixel perfect camera view requires perspective projection"
+      );
+
+      const float_t viewportHeight = (
+        (float_t)frameBufferGetHeight(FRAMEBUFFER_BOUND)
+      );
+      const float_t z = (viewportHeight / 2.0f) / (
+        camera->lookatPixelPerfect.pixelsPerUnit *
+        tanf(camera->perspective.fov / 2.0f)
+      );
+
+      vec3 position;
+      glm_vec3_copy(camera->lookatPixelPerfect.target, position);
+      glm_vec3_add(position, camera->lookatPixelPerfect.offset, position);
+      position[2] += z;
+
+      glm_lookat(
+        position,
+        camera->lookatPixelPerfect.target,
+        camera->lookatPixelPerfect.up,
+        view
+      );
+      break;
+
     case CAMERA_VIEW_TYPE_2D:
       glm_mat4_identity(view);
       glm_translate(view, (vec3){

src/display/camera.h

@@ -20,7 +20,8 @@ typedef enum {
 typedef enum {
   CAMERA_VIEW_TYPE_MATRIX,
   CAMERA_VIEW_TYPE_LOOKAT,
-  CAMERA_VIEW_TYPE_2D
+  CAMERA_VIEW_TYPE_2D,
+  CAMERA_VIEW_TYPE_LOOKAT_PIXEL_PERFECT
 } cameraviewtype_t;
 
 typedef struct {
@@ -36,6 +37,13 @@ typedef struct {
       float_t up[3];
     } lookat;
 
+    struct {
+      float_t offset[3];
+      float_t target[3];
+      float_t up[3];
+      float_t pixelsPerUnit;
+    } lookatPixelPerfect;
+
     struct {
       float_t position[2];
       float_t zoom;