Refator pass 1

src/display/framebuffer.c

@@ -0,0 +1,162 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "framebuffer.h"
+#include "display/display.h"
+#include "assert/assert.h"
+#include "util/memory.h"
+
+framebuffer_t FRAMEBUFFER_BACKBUFFER = {0};
+const framebuffer_t *FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;
+
+void frameBufferInitBackbuffer() {
+  memoryZero(&FRAMEBUFFER_BACKBUFFER, sizeof(framebuffer_t));
+
+  FRAMEBUFFER_BACKBUFFER.id = -1;
+  FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;
+}
+
+#if DISPLAY_SIZE_DYNAMIC == 1
+  void frameBufferInit(
+    framebuffer_t *framebuffer,
+    const uint32_t width,
+    const uint32_t height
+  ) {
+    #if DISPLAY_SDL2 == 1
+      assertNotNull(framebuffer, "Framebuffer cannot be NULL");
+      assertTrue(width > 0 && height > 0, "W/H must be greater than 0");
+
+      memoryZero(framebuffer, sizeof(framebuffer_t));
+      textureInit(&framebuffer->texture, width, height, GL_RGBA,(texturedata_t){
+        .rgba = { .colors = NULL }
+      });
+
+      glGenFramebuffersEXT(1, &framebuffer->id);
+      glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);
+
+      glFramebufferTexture2DEXT(
+        GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+        GL_TEXTURE_2D, framebuffer->texture.id, 0
+      );
+
+      if(
+        glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) !=
+        GL_FRAMEBUFFER_COMPLETE_EXT
+      ) {
+        assertUnreachable("Framebuffer is not complete");
+      }
+
+      glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+    #endif
+  }
+#endif
+
+int32_t frameBufferGetWidth(const framebuffer_t *framebuffer) {
+  #if DISPLAY_SDL2
+    if(framebuffer == &FRAMEBUFFER_BACKBUFFER) {
+      #if DISPLAY_SIZE_DYNAMIC == 0
+        return DISPLAY_WIDTH;
+      #else
+        int32_t windowWidth, windowHeight;
+        SDL_GetWindowSize(DISPLAY.window, &windowWidth, &windowHeight);
+        return windowWidth;
+      #endif
+    }
+
+    return framebuffer->texture.width;
+  #endif
+}
+
+int32_t frameBufferGetHeight(const framebuffer_t *framebuffer) {
+  #if DISPLAY_SDL2
+    if(framebuffer == &FRAMEBUFFER_BACKBUFFER) {
+      #if DISPLAY_SIZE_DYNAMIC == 0
+        return DISPLAY_HEIGHT;
+      #else
+        int32_t windowWidth, windowHeight;
+        SDL_GetWindowSize(DISPLAY.window, &windowWidth, &windowHeight);
+        return windowHeight;
+      #endif
+    }
+
+    return framebuffer->texture.height;
+  #endif
+}
+
+void frameBufferBind(const framebuffer_t *framebuffer) {
+  if(framebuffer == NULL) {
+    #if DISPLAY_SDL2
+      frameBufferBind(&FRAMEBUFFER_BACKBUFFER);
+    #endif
+
+    FRAMEBUFFER_BOUND = &FRAMEBUFFER_BACKBUFFER;
+    return;
+  }
+
+  // Bind the framebuffer for rendering
+  #if DISPLAY_SDL2
+    if(framebuffer == &FRAMEBUFFER_BACKBUFFER) {
+      #if PSP
+
+      #else
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+      #endif
+    } else {
+      #if PSP
+        assertUnreachable("Framebuffers not supported on PSP");
+      #else
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);
+      #endif
+    }
+    
+    glViewport(
+      0, 0,
+      frameBufferGetWidth(framebuffer), frameBufferGetHeight(framebuffer)
+    );
+  #endif
+
+  FRAMEBUFFER_BOUND = framebuffer;
+}
+
+void frameBufferClear(uint8_t flags, color_t color) {
+  #if DISPLAY_SDL2
+    GLbitfield glFlags = 0;
+
+    if(flags & FRAMEBUFFER_CLEAR_COLOR) {
+      glFlags |= GL_COLOR_BUFFER_BIT;
+      glClearColor(
+        color.r / 255.0f,
+        color.g / 255.0f,
+        color.b / 255.0f,
+        color.a / 255.0f
+      );
+    }
+
+    if(flags & FRAMEBUFFER_CLEAR_DEPTH) {
+      glFlags |= GL_DEPTH_BUFFER_BIT;
+    }
+
+    glClear(glFlags);
+  #endif
+}
+
+void frameBufferDispose(framebuffer_t *framebuffer) {
+  assertNotNull(framebuffer, "Framebuffer cannot be NULL");
+
+  #if DISPLAY_SDL2
+    if(framebuffer == &FRAMEBUFFER_BACKBUFFER) {
+      assertUnreachable("Cannot dispose of backbuffer");
+    }
+
+    #if DISPLAY_SIZE_DYNAMIC == 0
+      assertUnreachable("Dynamic size framebuffers not supported");
+    #else
+      textureDispose(&framebuffer->texture);
+      glDeleteFramebuffersEXT(1, &framebuffer->id);
+    #endif
+  #endif
+}