From 6b8af9cf83851c075c6c9514b1deaa931c2b19a4 Mon Sep 17 00:00:00 2001
From: Thomas Guillermo Albers Raviola <thomas@thomaslabs.org>
Date: Fri, 16 Jan 2026 23:02:32 +0100
Subject: Initial commit

---
 09-september/tomcat/not_in_use/fbo.c | 108 +++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 09-september/tomcat/not_in_use/fbo.c

(limited to '09-september/tomcat/not_in_use/fbo.c')

diff --git a/09-september/tomcat/not_in_use/fbo.c b/09-september/tomcat/not_in_use/fbo.c
new file mode 100644
index 0000000..5880276
--- /dev/null
+++ b/09-september/tomcat/not_in_use/fbo.c
@@ -0,0 +1,108 @@
+#include "fbo.h"
+#include "renderer.h"
+#include "../util/util.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+Fbo *fbo_new(const char *name, GLint width, GLint height)
+{
+    Fbo *fbo;
+
+    if(strlen(name) >= MAX_PATH_LENGTH)
+        Util_FatalError("Fbo name is too long: %s\n", name);
+
+    if(render.num_fbos >= MAX_FBOS)
+        return NULL;
+
+    fbo = malloc(sizeof(Fbo));
+    memset(fbo, 0, sizeof(Fbo));
+
+    glGenFramebuffers(1, &fbo->frame_buffer);
+
+    return fbo;
+}
+
+void fbo_attach_buffer(Fbo *fbo, GLenum format, int index)
+{
+    GLenum attachment;
+    GLuint *buffer;
+
+    switch(format)
+	{
+		case GL_RGB:
+		case GL_RGBA:
+			fbo->color_format = format;
+			buffer = &fbo->color_buffer[index];
+			attachment = GL_COLOR_ATTACHMENT0 + index;
+			break;
+
+		case GL_DEPTH_COMPONENT:
+			fbo->depth_format = format;
+			buffer = &fbo->depth_buffer;
+			attachment = GL_DEPTH_ATTACHMENT;
+			break;
+
+		default:
+			Util_FatalError("Invalid fbo buffer format\n");
+	}
+
+	if(*buffer == 0)
+	{
+        glGenRenderbuffers(1, buffer);
+        glBindRenderbuffer(GL_RENDERBUFFER, *buffer);
+        glRenderbufferStorage(GL_RENDERBUFFER, format, fbo->width, fbo->height);
+
+        fbo_bind(fbo);
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, attachment, GL_RENDERBUFFER, *buffer);
+        fbo_bind(NULL);
+        glBindRenderbuffer(GL_RENDERBUFFER, 0);
+    }
+}
+
+void fbo_attach_texture(Fbo *fbo, Texture *t, GLenum attachment)
+{
+    int index;
+
+    fbo_bind(fbo);
+    if(attachment >= GL_COLOR_ATTACHMENT0 && attachment < GL_COLOR_ATTACHMENT0 + 8)
+    {
+        glFramebufferTexture(GL_FRAMEBUFFER, attachment, t->tex_id, 0);
+        glDrawBuffers(1, &attachment);
+
+        index = attachment - GL_COLOR_ATTACHMENT0;
+        fbo->color_textures[index] = t;
+    }
+
+    fbo_bind(NULL);
+}
+
+void fbo_bind(Fbo *fbo)
+{
+    if(fbo)
+    {
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo->frame_buffer);
+        glViewport(0, 0, fbo->width, fbo->height);
+    }
+    else
+    {
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
+        glViewport(0, 0, render.window->Width, render.window->Height);
+    }
+}
+
+void fbo_purge(Fbo *fbo)
+{
+    int i;
+
+    for(i = 0; i < 8; i++)
+        if(fbo->color_buffer[i])
+        {
+            glDeleteRenderbuffers(1, &fbo->color_buffer[i]);
+        }
+    if(fbo->depth_buffer)
+        glDeleteRenderbuffers(1, &fbo->depth_buffer);
+
+    if(fbo->frame_buffer)
+        glDeleteFramebuffers(1, &fbo->frame_buffer);
+}
-- 
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