Add framebuffer resizing

1 files changed, 37 insertions, 18 deletions

diff --git a/src/include/daw/rendering.h b/src/include/daw/rendering.h
index 530a8e0..70b1566 100644
--- a/src/include/daw/rendering.h
+++ b/src/include/daw/rendering.h
@@ -264,26 +264,39 @@ typedef enum {
 
 
 // TODO: Change `2` once we add support for more formats
-#define BUFFERPARAMETER_FMT_GET(bufferparam) (BUFFERPARAMETER_GET_PARAMETER(bufferparam) & (((1 << 8) - 1) << 2))
-
 #define BUFFERPARAMETER_FMT_IS_COLOR(bufferparam) \
   ((BUFFERPARAMETER_GET_PARAMETER(bufferparam) & BUFFERPARAMETER_FMT_COLOR_MASK) != 0)
 
 #define BUFFERPARAMETER_FMT_IS_DEPTH_OR_STENCIL(bufferparam) \
   ((BUFFERPARAMETER_GET_PARAMETER(bufferparam) & BUFFERPARAMETER_FMT_DEPTH_STENCIL_MASK) != 0)
 
+// The textures and renderbuffers must be contigous in the rendertargets
+// `buffer` and `buffer_parameters` members
 typedef struct {
-  i32 num_attached_buffers;
-  ivec3 dimensions; // All objects attached to a framebuffer (in OpenGL) must have same size
+  // Number of attached textures
+  i8 num_textures;
+  // Number of attached renderbuffers
+  i8 num_renderbuffers;
+  // All objects attached to a framebuffer (at least in OpenGL) must have same
+  // size. Set the remainding dimensions to zero to indicate they're unused
+  // even though, mathematically speaking, they should be one.
+  ivec3 dimensions;
 } FramebufferParameters;
 
-// A render target takes a bunch of drawcalls, and renders it to a texture.
+// A render target takes a bunch of drawcalls, and renders it to either a
+// texture or buffer.
 // TODO: user runs "init" for their rendertarget(s) "stack", possibly using some
-// predefined macro "DEFAULT_RENDERTARGETS". Requires user to specify number of lights et. al.
+// predefined macro "DEFAULT_RENDERTARGETS". Requires user to specify number of
+// lights et. al.
+// The RenderTargets is technically two SOAs:
+// * framebuffers, holding the OpenGL "framebuffer name", buffer parameters,
+//   camera, and resize callbacks,
+// * and "buffers" (generalized name for "textures" and "renderbuffers")
 typedef struct {
-  // glFrameBuffer
+  // Number of framebuffers.
   usize framebuffer_len;
 
+  // OpenGL "names"
   u32 *framebuffer;
 
   // Number of buffers attached to each of the framebuffers. Used to iteratively
@@ -294,22 +307,25 @@ typedef struct {
   // One cam per framebuffer, is usually a pointer to user-allocated camera
   Camera **cam;
 
-  //// Called when window is resized with new width and height. Set to NULL to
-  //// skip changing texture_size. Comparable to glViewport.
-  //// This function can be heavy due to it destroying and re-creating framebuffers.
-  //// Which requires me to store the parameters that they we're created with.
-  //void (**framebuffer_size_callback)(ivec2*,ivec2);
+  // Indirectly called when window is resized with new width and height. Set to
+  // NULL to skip changing framebuffer_size. Comparable to glViewport.
+  // This function can be heavy due to it destroying and re-creating buffers,
+  // textures and framebuffers.
+  void (**framebuffer_size_callback)(ivec3* dst,ivec2 src);
 
-  //// Called when window is resized. Calls the respective texture_size_callback function at
-  //// the same index if not null. The camera resize callback function is then
-  //// called with the new dimensions of the texture.
-  //// Set to NULL to skip changing the camera size/perspective.
-  void (**camera_reset_callback)(Camera*,ivec2);
+  // Called when window is resized. Calls the respective framebuffer_size_callback function at
+  // the same index if not null. The camera resize callback function is then
+  // called with the new dimensions of the framebuffer if
+  // framebuffer_size_callback is not null, otherwise called with
+  // the new window size.
+  // Set to NULL to skip changing the camera size/perspective.
+  void (**camera_reset_callback)(Camera*,ivec2 src);
 
-  // glTexture / glRenderBuffer / glBuffer / glWhatever.
+  // glTexture and glRenderBuffer
   // Currently, each buffer must be either a texture or a (depth and/or stencil)
   // buffer.
   usize buffer_len;
+  // OpenGL buffer names
   u32 *buffer;
   // Stores per-buffer type, and type-specific parameters.
   u32 *buffer_parameters;
@@ -362,6 +378,9 @@ ShaderType guess_shadertype_from_filename(const char *restrict fname);
 
 Texture createTextureFromImageData(unsigned char* image_data, i32 width, i32 height, u8 components);
 
+// Creates and initializes buffers for the framebuffer
+void r_setup_framebuffer(void *restrict ctx, u32 framebuffer_id, FramebufferParameters param, u32 *restrict buffer_array, u32 *restrict buffer_parameters);
+
 void r_create_framebuffers(void* restrict ctx, u32* restrict framebuffer_array, usize num_targets);
 void r_destroy_framebuffers(void* restrict ctx, u32* restrict framebuffer_array, usize num_targets);
 void r_create_textures(void *restrict ctx, u32* restrict texture_array, u32* restrict texture_types, ivec3* restrict texture_sizes, usize num_targets);