Framebuffer done.

src/dusksdl2/display/CMakeLists.txt

@@ -15,6 +15,7 @@ target_sources(${DUSK_TARGET_NAME}
 
 # Subdirs
 add_subdirectory(camera)
+add_subdirectory(framebuffer)
 add_subdirectory(mesh)
 add_subdirectory(texture)
 add_subdirectory(spritebatch)

src/dusksdl2/display/camera/camera.c

@@ -11,6 +11,7 @@
 void cameraUIPush(void) {
   glPushMatrix();
   glLoadIdentity();
+  glViewport(0, 0, RENDER_WIDTH, RENDER_HEIGHT);
   glOrtho(
     0.0f, (float_t)RENDER_WIDTH,
     (float_t)RENDER_HEIGHT, 0.0f,

src/dusksdl2/display/framebuffer/CMakeLists.txt

@@ -0,0 +1,10 @@
+# Copyright (c) 2025 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DUSK_TARGET_NAME}
+  PRIVATE
+    framebuffer.c
+)

src/dusksdl2/display/framebuffer/framebuffer.c

@@ -0,0 +1,57 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "framebuffer.h"
+#include "assert/assert.h"
+#include "util/memory.h"
+
+void frameBufferInit(
+  framebuffer_t *framebuffer,
+  const uint32_t width,
+  const uint32_t height
+) {
+  assertNotNull(framebuffer, "Framebuffer cannot be NULL");
+  assertTrue(width > 0 && height > 0, "Width & height must be greater than 0");
+
+  memoryZero(framebuffer, sizeof(framebuffer_t));
+  textureInit(&framebuffer->texture, width, height, NULL);
+
+  // Generate the framebuffer object
+  glGenFramebuffers(1, &framebuffer->id);
+  glBindFramebuffer(GL_FRAMEBUFFER, framebuffer->id);
+
+  // Attach the texture to the framebuffer
+  glFramebufferTexture2D(
+    GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+    GL_TEXTURE_2D, framebuffer->texture.id, 0
+  );
+
+  // Check if the framebuffer is complete
+  if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+    assertUnreachable("Framebuffer is not complete");
+  }
+
+  // Unbind the framebuffer
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void frameBufferBind(const framebuffer_t *framebuffer) {
+  if(framebuffer == NULL) {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    return;
+  }
+
+  // Bind the framebuffer for rendering
+  glBindFramebuffer(GL_FRAMEBUFFER, framebuffer->id);
+}
+
+void frameBufferDispose(framebuffer_t *framebuffer) {
+  assertNotNull(framebuffer, "Framebuffer cannot be NULL");
+
+  glDeleteFramebuffers(1, &framebuffer->id);
+  textureDispose(&framebuffer->texture);
+}

src/dusksdl2/display/framebuffer/framebuffer.h

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "display/texture/texture.h"
+
+typedef struct {
+  GLuint id;
+  texture_t texture;
+} framebuffer_t;
+
+/**
+ * Initializes a framebuffer.
+ * 
+ * @param framebuffer The framebuffer to initialize.
+ * @param width The width of the framebuffer.
+ * @param height The height of the framebuffer.
+ * @return An error code indicating success or failure.
+ */
+void frameBufferInit(
+  framebuffer_t *framebuffer,
+  const uint32_t width,
+  const uint32_t height
+);
+
+/**
+ * Binds the framebuffer for rendering.
+ * 
+ * @param framebuffer The framebuffer to bind, or NULL to unbind.
+ */
+void frameBufferBind(const framebuffer_t *framebuffer);
+
+/**
+ * Disposes of the framebuffer.
+ * 
+ * @param framebuffer The framebuffer to dispose of.
+ */
+void frameBufferDispose(framebuffer_t *framebuffer);

src/dusksdl2/display/render.c

@@ -74,8 +74,6 @@ errorret_t renderInit(void) {
   spriteBatchInit();
   renderTextInit();
   renderBackBufferInit();
-  
-  // Init other things
   renderSceneInit();
   
   RENDER_RUNNING = true;
@@ -101,17 +99,14 @@ errorret_t renderDraw(void) {
   // Draw everything
   renderSceneDraw();
   
-
+  // UI
   cameraUIPush();
   renderConsoleDraw();
   spriteBatchFlush();
   cameraUIPop();
 
-  // Finish rendering
-  spriteBatchFlush();
+  // Finish rendering, now render back buffer.
   renderBackBufferUnbind();
-
-  // Draw the back buffer to the window
   renderBackBufferDraw();
 
   SDL_GL_SwapWindow(RENDER_WINDOW);
@@ -119,12 +114,11 @@ errorret_t renderDraw(void) {
 }
 
 errorret_t renderDispose(void) {
+  renderSceneDispose();
+  renderBackBufferDispose();
+  renderTextDispose();
   spriteBatchDispose();
 
-  // renderTextDispose();
-  // renderSceneDispose();
-  // renderBackBufferDispose();
-
   // Destroy OpenGL context
   SDL_GL_DeleteContext(RENDER_GL_CONTEXT);
   SDL_DestroyWindow(RENDER_WINDOW);

src/dusksdl2/display/renderbackbuffer.c

@@ -11,27 +11,16 @@
 #include "display/camera/camera.h"
 
 #if RENDER_USE_FRAMEBUFFER
-  SDL_Texture *RENDER_BACKBUFFER;
-#else
-
+  framebuffer_t RENDER_BACKBUFFER;
 #endif
 
 errorret_t renderBackBufferInit(void) {
   #if RENDER_USE_FRAMEBUFFER
-    // RENDER_BACKBUFFER = SDL_CreateTexture(
-    //   RENDER_RENDERER,
-    //   SDL_PIXELFORMAT_RGBA8888,
-    //   SDL_TEXTUREACCESS_TARGET,
-    //   RENDER_WIDTH,
-    //   RENDER_HEIGHT
-    // );
-
-    if(!RENDER_BACKBUFFER) {
-      errorThrow("SDL_CreateTexture failed: %s", SDL_GetError());
-    }
-
-    // Make sure we unbind the back buffer after creation
-    // SDL_SetRenderTarget(RENDER_RENDERER, NULL);
+    frameBufferInit(
+      &RENDER_BACKBUFFER,
+      RENDER_WIDTH,
+      RENDER_HEIGHT
+    );
   #else
     // No back buffer needed for window rendering
   #endif
@@ -41,7 +30,7 @@ errorret_t renderBackBufferInit(void) {
 
 void renderBackBufferBind(void) {
   #if RENDER_USE_FRAMEBUFFER
-    // SDL_SetRenderTarget(RENDER_RENDERER, RENDER_BACKBUFFER);
+    frameBufferBind(&RENDER_BACKBUFFER);
   #endif
   
   // Fill background with cornflower blue.
@@ -51,7 +40,7 @@ void renderBackBufferBind(void) {
 
 void renderBackBufferUnbind(void) {
   #if RENDER_USE_FRAMEBUFFER
-    // SDL_SetRenderTarget(RENDER_RENDERER, NULL);
+    frameBufferBind(NULL);
   #endif
 }
 
@@ -82,11 +71,11 @@ void renderBackBufferDraw(void) {
     // Draw the back buffer texture
     spriteBatchClear();
     spriteBatchPush(
-      NULL,
+      &RENDER_BACKBUFFER.texture,
       renderX, renderY,
       renderX+renderWidth, renderY+renderHeight,
-      0xFF, 0x00, 0xFF, 0xFF,
-      0, 0, 1, 1
+      0xFF, 0xFF, 0xFF, 0xFF,
+      0, 1, 1, 0
     );
     spriteBatchFlush();
     cameraScreenPop();
@@ -97,8 +86,7 @@ void renderBackBufferDraw(void) {
 
 errorret_t renderBackBufferDispose(void) {
   #if RENDER_USE_FRAMEBUFFER
-    SDL_DestroyTexture(RENDER_BACKBUFFER);
-    RENDER_BACKBUFFER = NULL;
+    frameBufferDispose(&RENDER_BACKBUFFER);
   #endif
 
   errorOk();

src/dusksdl2/display/renderbackbuffer.h

@@ -7,6 +7,11 @@
 
 #pragma once
 #include "display/renderbase.h"
+#include "display/framebuffer/framebuffer.h"
+
+#if RENDER_USE_FRAMEBUFFER
+  extern framebuffer_t RENDER_BACKBUFFER;
+#endif
 
 /**
  * Initializes the render back buffer. May be either a framebuffer or a texture

src/dusksdl2/display/texture/texture.c

@@ -17,7 +17,6 @@ void textureInit(
 ) {
   assertNotNull(texture, "Texture cannot be NULL");
   assertTrue(width > 0 && height > 0, "Width and height must be greater than 0");
-  assertNotNull(data, "Data cannot be NULL");
 
   #if PSP || 1
     assertTrue(