create basic honey_camera

4 files changed, 144 insertions, 3 deletions

diff --git a/src/camera.c b/src/camera.c
new file mode 100644
index 0000000..95636e9
--- /dev/null
+++ b/src/camera.c
@@ -0,0 +1,137 @@
+#include "include/camera.h"
+
+void honey_camera_new(honey_camera* camera,
+                      vec3 position,
+                      vec3 angle,
+                      enum honey_camera_projection projection_type,
+                      float aspect_ratio,
+                      float near, float far,
+                      float fov,
+                      float left, float right, float top, float bottom) {
+  glm_vec3_copy(position, camera->position);
+  glm_vec3_copy(angle, camera->angle);
+
+  camera->projection_type = projection_type;
+
+  camera->aspect_ratio = aspect_ratio;
+  camera->near = near;
+  camera->far = far;
+  
+  if (projection_type == HONEY_PERSPECTIVE) {
+    camera->fov = fov;
+  }
+  else if (projection_type == HONEY_ORTHOGRAPHIC) {
+    camera->ortho_left = left;
+    camera->ortho_right = right;
+    camera->ortho_top = top;
+    camera->ortho_bottom = bottom;
+  }
+
+  honey_camera_calculate_view(camera);
+  honey_camera_calculate_projection(camera);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_new_perspective(honey_camera* camera,
+                                  vec3 position,
+                                  vec3 angle,
+                                  float aspect_ratio,
+                                  float near, float far,
+                                  float fov) {
+  honey_camera_new(camera,
+                   position, angle,
+                   HONEY_PERSPECTIVE,
+                   aspect_ratio, near, far, fov,
+                   0, 0, 0, 0);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_new_orthographic(honey_camera* camera,
+                                   vec3 position,
+                                   vec3 angle,
+                                   float near, float far,
+                                   float left, float right, float top, float bottom) {
+  honey_camera_new(camera,
+                   position, angle,
+                   HONEY_ORTHOGRAPHIC,
+                   0,
+                   near, far,
+                   0,
+                   left, right, top, bottom);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_calculate_look_direction(honey_camera* camera) {
+  float pitch = camera->angle[0];
+  float yaw = camera->angle[1];
+
+  float x = cos(pitch) * cos(yaw);
+  float y = sin(pitch);
+  float z = cos(pitch) * sin(yaw);
+
+  camera->look_direction[0] = x;
+  camera->look_direction[1] = y;
+  camera->look_direction[2] = z;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_calculate_up(honey_camera* camera) {
+ float pitch = camera->angle[0];
+ float yaw = camera->angle[1];
+ float roll = camera->angle[2];
+
+ camera->up[0] = 0;
+ camera->up[1] = 1;
+ camera->up[2] = 0;
+
+ mat3 rot3;
+ mat4 rot4;
+ glm_mat4_identity(rot4);
+ glm_rotate(rot4, roll, camera->look_direction);
+ glm_mat4_pick3(rot4, rot3);
+
+ glm_mat3_mulv(rot3, camera->up, camera->up);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_calculate_right(honey_camera* camera) {
+  glm_vec3_cross(camera->up, camera->look_direction, camera->right);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_calculate_view(honey_camera* camera) {
+  honey_camera_calculate_look_direction(camera);
+  honey_camera_calculate_up(camera);
+  honey_camera_calculate_right(camera);
+
+  glm_look(camera->position, camera->look_direction, camera->up, camera->view);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_camera_calculate_projection(honey_camera* camera) {
+  if (camera->projection_type == HONEY_PERSPECTIVE) {
+    glm_mat4_identity(camera->projection);
+    glm_perspective(camera->fov,
+                    camera->aspect_ratio,
+                    camera->near,
+                    camera->far,
+                    camera->projection);
+  }
+  else if (camera->projection_type == HONEY_ORTHOGRAPHIC) {
+    glm_mat4_identity(camera->projection);
+    glm_ortho(camera->ortho_left,
+              camera->ortho_right,
+              camera->ortho_bottom,
+              camera->ortho_top,
+              camera->near,
+              camera->far,
+              camera->projection);
+  }
+}
diff --git a/src/honey.c b/src/honey.c
index b6f783f..e9396f1 100644
--- a/src/honey.c
+++ b/src/honey.c
@@ -28,6 +28,10 @@ honey_window honey_setup(int screen_width, int screen_height, char* window_title
     return NULL;
   }
 
+  // Enable blending
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  
   return window;
 }
 
diff --git a/src/shader.c b/src/shader.c
index b9e13da..d726523 100644
--- a/src/shader.c
+++ b/src/shader.c
@@ -101,10 +101,10 @@ void honey_shader_set_int(honey_shader shader,
 
 void honey_shader_set_mat4(honey_shader shader,
                            char* matrix_name,
-                           float* matrix) {
+                           mat4 matrix) {
   glUseProgram(shader);
   unsigned int matrix_location = glGetUniformLocation(shader, matrix_name);
-  glUniformMatrix4fv(matrix_location, 1, GL_FALSE, matrix);
+  glUniformMatrix4fv(matrix_location, 1, GL_FALSE, (float*) matrix);
 }
 
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
diff --git a/src/texture.c b/src/texture.c
index c1a5843..dfdbdd2 100644
--- a/src/texture.c
+++ b/src/texture.c
@@ -20,7 +20,7 @@ enum honey_texture_result honey_texture_new(honey_texture* texture,
   }
 
   if (alpha_channel) {
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image_data);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image_data);
   }
   else {
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image_data);