ECS POC

archive/camera/CMakeLists.txt

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+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
+    camera.c
+)

archive/camera/camera.c

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+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "camera.h"
+#include "display/display.h"
+#include "assert/assert.h"
+#include "display/framebuffer/framebuffer.h"
+#include "display/screen/screen.h"
+
+void cameraInit(camera_t *camera) {
+  cameraInitPerspective(camera);
+}
+
+void cameraInitPerspective(camera_t *camera) {
+  assertNotNull(camera, "Not a camera component");
+
+  camera->projType = CAMERA_PROJECTION_TYPE_PERSPECTIVE;
+  camera->perspective.fov = glm_rad(45.0f);
+  camera->nearClip = 0.1f;
+  camera->farClip = 10000.0f;
+
+  camera->viewType = CAMERA_VIEW_TYPE_LOOKAT;
+  glm_vec3_copy((vec3){ 5.0f, 5.0f, 5.0f }, camera->lookat.position);
+  glm_vec3_copy((vec3){ 0.0f, 1.0f, 0.0f }, camera->lookat.up);
+  glm_vec3_copy((vec3){ 0.0f, 0.0f, 0.0f }, camera->lookat.target);
+}
+
+void cameraInitOrthographic(camera_t *camera) {
+  assertNotNull(camera, "Not a camera component");
+
+  camera->projType = CAMERA_PROJECTION_TYPE_ORTHOGRAPHIC;
+  camera->orthographic.left = 0.0f;
+  camera->orthographic.right = SCREEN.width;
+  camera->orthographic.top = SCREEN.height;
+  camera->orthographic.bottom = 0.0f;
+  camera->nearClip = 0.1f;
+  camera->farClip = 1.0f;
+
+  camera->viewType = CAMERA_VIEW_TYPE_2D;
+  glm_vec2_copy((vec2){ 0.0f, 0.0f }, camera->_2d.position);
+  camera->_2d.zoom = 1.0f;
+}
+
+void cameraGetProjectionMatrix(camera_t *camera, mat4 dest) {
+  assertNotNull(camera, "Not a camera component");
+  assertNotNull(dest, "Destination matrix must not be null");
+
+  if(
+    camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE ||
+    camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED
+  ) {
+    glm_mat4_identity(dest);
+    glm_perspective(
+      camera->perspective.fov,
+      SCREEN.aspect,
+      camera->nearClip,
+      camera->farClip,
+      dest
+    );
+
+    if(camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED) {
+      dest[1][1] *= -1.0f;
+    }
+  } else if(camera->projType == CAMERA_PROJECTION_TYPE_ORTHOGRAPHIC) {
+    glm_mat4_identity(dest);
+    glm_ortho(
+      camera->orthographic.left,
+      camera->orthographic.right,
+      camera->orthographic.top,
+      camera->orthographic.bottom,
+      camera->nearClip,
+      camera->farClip,
+      dest
+    );
+  }
+}
+
+void cameraGetViewMatrix(camera_t *camera, mat4 dest) {
+  assertNotNull(camera, "Not a camera component");
+  assertNotNull(dest, "Destination matrix must not be null");
+
+  if(camera->viewType == CAMERA_VIEW_TYPE_MATRIX) {
+    glm_mat4_ucopy(camera->view, dest);
+  } else if(camera->viewType == CAMERA_VIEW_TYPE_LOOKAT) {
+    glm_mat4_identity(dest);
+    glm_lookat(
+      camera->lookat.position,
+      camera->lookat.target,
+      camera->lookat.up,
+      dest
+    );
+  } else if(camera->viewType == CAMERA_VIEW_TYPE_2D) {
+    glm_mat4_identity(dest);
+    glm_lookat(
+      (vec3){ camera->_2d.position[0], camera->_2d.position[1], 0.5f },
+      (vec3){ camera->_2d.position[0], camera->_2d.position[1], 0.0f },
+      (vec3){ 0.0f, 1.0f, 0.0f },
+      dest
+    );
+  } else if(camera->viewType == CAMERA_VIEW_TYPE_LOOKAT_PIXEL_PERFECT) {
+    assertUnreachable("LOOKAT_PIXEL_PERFECT view type is not implemented yet");
+  }
+}

archive/camera/camera.h

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+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "dusk.h"
+#include "display/color.h"
+#include "display/camera/cameraplatform.h"
+
+#ifndef cameraPushMatrixPlatform
+  #error "cameraPushMatrixPlatform must be defined"
+#endif
+
+
+typedef enum {
+  CAMERA_VIEW_TYPE_MATRIX,
+  CAMERA_VIEW_TYPE_LOOKAT,
+  CAMERA_VIEW_TYPE_2D,
+  CAMERA_VIEW_TYPE_LOOKAT_PIXEL_PERFECT
+} cameraviewtype_t;
+
+typedef struct camera_s {
+  union {
+    mat4 view;
+
+    struct {
+      vec3 position;
+      vec3 target;
+      vec3 up;
+    } lookat;
+
+    struct {
+      vec3 offset;
+      vec3 target;
+      vec3 up;
+      float_t pixelsPerUnit;
+    } lookatPixelPerfect;
+
+    struct {
+      vec2 position;
+      float_t zoom;
+    } _2d;
+  };
+
+  union {
+    struct {
+      float_t fov;
+    } perspective;
+
+    struct {
+      float_t left;
+      float_t right;
+      float_t top;
+      float_t bottom;
+    } orthographic;
+  };
+  
+  float_t nearClip;
+  float_t farClip;
+  
+  cameraprojectiontype_t projType;
+  cameraviewtype_t viewType;
+} camera_t;
+
+/**
+ * Initializes a camera to default values. This calls cameraInitPerspective.
+ */
+void cameraInit(camera_t *camera);
+
+/**
+ * Initializes a camera for perspective projection.
+ */
+void cameraInitPerspective(camera_t *camera);
+
+/**
+ * Initializes a camera for orthographic projection.
+ */
+void cameraInitOrthographic(camera_t *camera);
+
+/**
+ * Gets the projection matrix for a camera.
+ * 
+ * @param camera Camera to get the projection matrix for
+ * @param dest Matrix to store the projection matrix in
+ */
+void cameraGetProjectionMatrix(camera_t *camera, mat4 dest);
+
+/**
+ * Gets the view matrix for a camera.
+ * 
+ * @param camera Camera to get the view matrix for
+ * @param dest Matrix to store the view matrix in
+ */
+void cameraGetViewMatrix(camera_t *camera, mat4 dest);