move and rename private/rendering.h to rendering/internal_api.h

src/rendering/circles.h

@@ -3,7 +3,7 @@
 #define CIRCLES_H
 
 #include "../util.h"
-#include "../private/rendering.h"
+#include "internal_api.h"
 #include "../context.h"
 
 #include <SDL2/SDL.h>

src/rendering/internal_api.h

@@ -0,0 +1,81 @@
+#ifndef RENDERING_INTERNAL_API_H
+#define RENDERING_INTERNAL_API_H
+#include "../textures.h"
+#include "../util.h"
+
+#include <SDL2/SDL.h>
+#include <glad/glad.h>
+
+#include <stdbool.h>
+
+struct sprite_primitive {
+    t_frect rect;
+    t_color color;
+    float rotation;
+    t_texture_key texture_key;
+    bool flip_x;
+    bool flip_y;
+};
+
+struct rect_primitive {
+    t_frect rect;
+    t_color color;
+};
+
+struct circle_primitive {
+    float radius;
+    t_color color;
+    t_fvec2 position;
+};
+
+enum primitive_2d_type {
+    PRIMITIVE_2D_SPRITE,
+    PRIMITIVE_2D_RECT,
+    PRIMITIVE_2D_CIRCLE,
+};
+
+struct primitive_2d {
+    enum primitive_2d_type type;
+
+    union {
+        struct sprite_primitive sprite;
+        struct rect_primitive rect;
+        struct circle_primitive circle;
+    };
+};
+
+/* union for in-place recalculation of texture coordinates */
+union uncolored_space_triangle {
+    /* pending for sending, uvs are not final as texture atlases could update */
+    struct uncolored_space_triangle_primitive {
+        t_fvec3 v0;
+        t_fvec2 uv0; /* in pixels */
+        t_fvec3 v1;
+        t_fvec2 uv1; /* in pixels */
+        t_fvec3 v2;
+        t_fvec2 uv2; /* in pixels */
+    } primitive;
+
+    /* structure that is passed in opengl vertex array */
+    struct uncolored_space_triangle_payload {
+        t_fvec3 v0;
+        t_fvec2 uv0;
+        t_fvec3 v1;
+        t_fvec2 uv1;
+        t_fvec3 v2;
+        t_fvec2 uv2;
+    } payload;
+};
+
+/* batch of primitives with overlapping properties */
+struct mesh_batch {
+    GLuint buffer;          /* server side storage */
+    uint8_t *primitives;
+};
+
+struct mesh_batch_item {
+    t_texture_key key;
+    struct mesh_batch value;
+};
+
+#endif