archivemuh

archive/dusksdl2/display/framebuffer/framebuffer.c

@@ -0,0 +1,59 @@
+/**
+ * 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"
+
+#if RENDER_USE_FRAMEBUFFER
+  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, GL_RGBA, NULL);
+
+    // Generate the framebuffer object using EXT
+    glGenFramebuffersEXT(1, &framebuffer->id);
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);
+
+    // Attach the texture to the framebuffer
+    glFramebufferTexture2DEXT(
+      GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+      GL_TEXTURE_2D, framebuffer->texture.id, 0
+    );
+
+    // Check if the framebuffer is complete
+    if(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      assertUnreachable("Framebuffer is not complete");
+    }
+
+    // Unbind the framebuffer
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+  }
+
+  void frameBufferBind(const framebuffer_t *framebuffer) {
+    if(framebuffer == NULL) {
+      glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+      return;
+    }
+
+    // Bind the framebuffer for rendering
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);
+  }
+
+  void frameBufferDispose(framebuffer_t *framebuffer) {
+    assertNotNull(framebuffer, "Framebuffer cannot be NULL");
+
+    glDeleteFramebuffersEXT(1, &framebuffer->id);
+    textureDispose(&framebuffer->texture);
+  }
+#endif