fix mixing up of SDL and libc allocators, proper flushing of quad build buffers

src/rendering/twn_deferred_commands.h

@@ -43,7 +43,7 @@ typedef struct {
     TextureKey texture_key;
     GPUTexture gpu_texture;
 
-    /* could be either `element_count` with supplied `element_buffer`, or this, but not both */
+    /* could be either `element_count` with supplied `element_buffer`, or `primitive_count`, but not both */
     uint32_t primitive_count;
     uint32_t element_buffer;
     uint32_t element_count;

src/rendering/twn_gl_15_rendering.c

@@ -229,7 +229,8 @@ VertexBufferBuilder build_vertex_buffer(VertexBuffer buffer, size_t bytes) {
 
 
 void finish_vertex_builder(VertexBufferBuilder *builder) {
-    glUnmapBuffer(GL_ARRAY_BUFFER);
+    if (!glUnmapBuffer(GL_ARRAY_BUFFER))
+        CRY("finish_vertex_builder", "Error unmapping a vertex array buffer");
     glBindBuffer(GL_ARRAY_BUFFER, 0);
 
     builder->base = 0;

src/rendering/twn_gl_any_rendering.c

@@ -31,6 +31,7 @@ void delete_vertex_buffer(VertexBuffer buffer) {
 void specify_vertex_buffer(VertexBuffer buffer, void const *data, size_t bytes) {
     glBindBuffer(GL_ARRAY_BUFFER, buffer);
     glBufferData(GL_ARRAY_BUFFER, bytes, data, GL_STREAM_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
 }
 
 

src/rendering/twn_rects.c

@@ -90,6 +90,8 @@ void render_rect_batch(const Primitive2D primitives[],
                 (Vec2){0}, (Vec2){0}, (Vec2){0}, (Vec2){0},
                 rect.color);
         }
+
+        finish_vertex_builder(&payload);
     }
 
     finally_render_quads(primitives, batch, vertex_array);

src/rendering/twn_sprites.c

@@ -244,6 +244,8 @@ void render_sprite_batch(const Primitive2D primitives[],
 
             push_quad_payload_to_vertex_buffer_builder(batch, i, &payload, v0, v1, v2, v3, uv0, uv1, uv2, uv3, sprite.color);
         }
+
+        finish_vertex_builder(&payload);
     }
 
     finally_render_quads(primitives, batch, vertex_array);

src/twn_util_c.h

@@ -11,6 +11,10 @@
 #define MAX SDL_max
 #define MIN SDL_min
 
+void *cmalloc(size_t size);
+void *crealloc(void *ptr, size_t size);
+void *ccalloc(size_t num, size_t size);
+
 void cry_impl(const char *file, const int line, const char *title, const char *text);
 #define CRY(title, text) cry_impl(__FILE__, __LINE__, title, text)
 #define CRY_SDL(title) cry_impl(__FILE__, __LINE__, title, SDL_GetError())