From f63289903b37781a57d7ad6b3c3a8f312ccae25d Mon Sep 17 00:00:00 2001
From: Rakarake <raka@rakarake.xyz>
Date: Mon, 8 Dec 2025 05:08:01 +0100
Subject: [PATCH] good baseline working

---
 Makefile |   2 +-
 main.c   | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 108 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 4ef9a13..b087ba7 100644
--- a/Makefile
+++ b/Makefile
@@ -6,4 +6,4 @@ all:
 	$(CC) $(CFLAGS) $(LDFLAGS) -o glonkers main.c
 
 run: all
-	./glonkers
+	SDL_VIDEODRIVER="wayland,x11" ./glonkers
diff --git a/main.c b/main.c
index 26914de..1fde8b2 100644
--- a/main.c
+++ b/main.c
@@ -2,6 +2,88 @@
 #include <GL/gl.h>
 #include <SDL3/SDL.h>
 
+float tanf(float in) {
+    return in;
+}
+
+void perspective(float fovY, float aspect, float zNear, float zFar, float* matrix) {
+    float f = 1.0f / tanf(fovY * 0.5f * (3.14159265358979323846f / 180.0f));
+    matrix[0]  = f / aspect;
+    matrix[1]  = 0;
+    matrix[2]  = 0;
+    matrix[3]  = 0;
+
+    matrix[4]  = 0;
+    matrix[5]  = f;
+    matrix[6]  = 0;
+    matrix[7]  = 0;
+
+    matrix[8]  = 0;
+    matrix[9]  = 0;
+    matrix[10] = (zFar + zNear) / (zNear - zFar);
+    matrix[11] = -1;
+
+    matrix[12] = 0;
+    matrix[13] = 0;
+    matrix[14] = (2 * zFar * zNear) / (zNear - zFar);
+    matrix[15] = 0;
+}
+
+void drawCube() {
+    glBegin(GL_QUADS);
+
+    // Front
+    glColor3f(1, 0, 0);
+    glVertex3f(-1, -1,  1);
+    glVertex3f( 1, -1,  1);
+    glVertex3f( 1,  1,  1);
+    glVertex3f(-1,  1,  1);
+
+    // Back
+    glColor3f(0, 1, 0);
+    glVertex3f(-1, -1, -1);
+    glVertex3f(-1,  1, -1);
+    glVertex3f( 1,  1, -1);
+    glVertex3f( 1, -1, -1);
+
+    // Top
+    glColor3f(0, 0, 1);
+    glVertex3f(-1, 1, -1);
+    glVertex3f(-1, 1,  1);
+    glVertex3f( 1, 1,  1);
+    glVertex3f( 1, 1, -1);
+
+    // Bottom
+    glColor3f(1, 1, 0);
+    glVertex3f(-1, -1, -1);
+    glVertex3f( 1, -1, -1);
+    glVertex3f( 1, -1,  1);
+    glVertex3f(-1, -1,  1);
+
+    // Right
+    glColor3f(1, 0, 1);
+    glVertex3f(1, -1, -1);
+    glVertex3f(1,  1, -1);
+    glVertex3f(1,  1,  1);
+    glVertex3f(1, -1,  1);
+
+    // Left
+    glColor3f(0, 1, 1);
+    glVertex3f(-1, -1, -1);
+    glVertex3f(-1, -1,  1);
+    glVertex3f(-1,  1,  1);
+    glVertex3f(-1,  1, -1);
+
+    glEnd();
+}
+
+void checkGlError() {
+    const char *err = SDL_GetError();
+    if (*err != 0) {
+        printf("OpenGL error: %s", err);
+    }
+}
+
 int main() {
     printf("Good Morning 🍵\n");
     SDL_Init(SDL_INIT_VIDEO);
@@ -24,13 +106,34 @@ int main() {
 
     SDL_Event e;
     int running = 1;
-    while (SDL_PollEvent(&e)) {
-        printf("INSgkldjsj\n");
-        if (e.type == SDL_EVENT_QUIT) running = false;
+    float angle = 0.0;
+    while (running) {
+        while (SDL_PollEvent(&e)) {
+            if (e.type == SDL_EVENT_QUIT) running = false;
+        }
+        checkGlError();
+
         // Rendorrrr
         glViewport(0, 0, 800, 600);
         glClearColor(0.1f, 0.1f, 0.1f, 1.0f);  // Dark gray background
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-//SDL_GL_SwapWindow(window);
+
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        
+        float proj[16];
+        perspective(60.0f, 800.0f / 600.0f, 1.0f, 100.0f, proj);
+        glLoadMatrixf(proj);
+
+        glMatrixMode(GL_MODELVIEW);
+        glLoadIdentity();
+        glTranslatef(0.0f, 0.0f, -5.0f);
+        glRotatef(angle, 1.0f, 1.0f, 0.0f);
+        
+        drawCube();
+        SDL_GL_SwapWindow(window);
+        angle += 0.5;
     }
+
+    checkGlError();
 }