From c451018c17ce4953a7011fce6cafa55e362e0005 Mon Sep 17 00:00:00 2001
From: kkard2 <contact@kkard2.com>
Date: Sat, 6 Sep 2025 15:59:51 +0200
Subject: rainbow

---
 examples/rainbow.c | 25 +++++++++++++++++++++++++
 platform_win32.c   | 23 ++++++++++++++++++++++-
 run.bat            |  1 +
 sponge.h           |  1 -
 4 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 examples/rainbow.c

diff --git a/examples/rainbow.c b/examples/rainbow.c
new file mode 100644
index 0000000..33cbb2d
--- /dev/null
+++ b/examples/rainbow.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <math.h>
+
+
+
+#include "../sponge.h"
+
+#define PI ((float)3.14159265358979323846)
+#define SPEED (2.0f / 360.0f * 2 * PI)
+static float angle = 0.0f;
+
+void draw_frame(sponge_Texture c) {
+    angle += SPEED;
+
+    float rf = (sinf(angle) + 1.0f) * 255.0f / 2.0f;
+    float gf = (sinf(angle + (PI * 2.0f / 3.0f)) + 1.0f) * 255.0f / 2.0f;
+    float bf = (sinf(angle + (PI * 4.0f / 3.0f)) + 1.0f) * 255.0f / 2.0f;
+
+    int r = (((int)rf) & 0xFF) << 16;
+    int g = (((int)gf) & 0xFF) << 8;
+    int b = (((int)bf) & 0xFF) << 0;
+
+    uint32_t color = 0xFF000000 | r | g | b;
+    sponge_clear(c, color);
+}
diff --git a/platform_win32.c b/platform_win32.c
index 1d7ff57..620b8a2 100644
--- a/platform_win32.c
+++ b/platform_win32.c
@@ -1,13 +1,16 @@
 #define UNICODE
 #include <windows.h>
 #include <assert.h>
+#include <stdio.h>
+#include <io.h>
+
+#include <fcntl.h>
 
 #define SPONGE_IMPLEMENTATION
 #include "sponge.h"
 
 #include "example.h"
 
-// TODO(kard): ofc some resizing stuff
 #define DEFAULT_WIDTH 256
 #define DEFAULT_HEIGHT 256
 
@@ -36,6 +39,22 @@ int update_canvas(sponge_Texture *canvas, uint32_t new_width, uint32_t new_heigh
     bmi.bmiHeader.biPlanes      = 1;
     bmi.bmiHeader.biBitCount    = 32;
     bmi.bmiHeader.biCompression = BI_RGB;
+    return 1;
+}
+
+// TODO(kard): MSVC complains about freopen (should be freopen_s apparently)
+void redirect_io_to_console() {
+    AllocConsole();
+    FILE *fp;
+
+    fp = freopen("CONOUT$", "w", stdout);
+    setvbuf(stdout, NULL, _IONBF, 0);
+
+    fp = freopen("CONOUT$", "w", stderr);
+    setvbuf(stderr, NULL, _IONBF, 0);
+
+    fp = freopen("CONIN$", "r", stdin);
+    setvbuf(stdin, NULL, _IONBF, 0);
 }
 
 LRESULT WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
@@ -61,6 +80,8 @@ int WinMain(
     LPSTR     lpCmdLine,
     int       nShowCmd
 ) {
+    redirect_io_to_console();
+
     const wchar_t CLASS_NAME[]  = L"sponge";
 
     WNDCLASS wc = { 0 };
diff --git a/run.bat b/run.bat
index 913a542..0eb177d 100644
--- a/run.bat
+++ b/run.bat
@@ -1,3 +1,4 @@
 del out.exe
+del *.obj
 cl platform_win32.c "examples\%1" user32.lib gdi32.lib /W3 /Fe:out.exe
 out.exe
diff --git a/sponge.h b/sponge.h
index 6255236..2978e0e 100644
--- a/sponge.h
+++ b/sponge.h
@@ -10,7 +10,6 @@ typedef struct {
 
 void sponge_clear(sponge_Texture c, uint32_t color);
 void sponge_draw_rect(sponge_Texture c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t color);
-void sponge_draw_texture(sponge_Texture c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, sponge_Texture texture);
 
 // TODO(kard): prefix stripping
 
-- 
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