From be3d3e4b25832ff5dab130e21b7dde185b168ae0 Mon Sep 17 00:00:00 2001
From: Carlos Sanchez <randomouscrap98@aol.com>
Date: Tue, 23 Jul 2024 19:00:19 -0400
Subject: [PATCH] Beginning tinyrender

---
 tinyrender1/.gitignore |  1 +
 tinyrender1/go.mod     |  3 +++
 tinyrender1/image.go   | 46 ++++++++++++++++++++++++++++++++++++++++++
 tinyrender1/main.go    | 18 +++++++++++++++++
 4 files changed, 68 insertions(+)
 create mode 100644 tinyrender1/.gitignore
 create mode 100644 tinyrender1/go.mod
 create mode 100644 tinyrender1/image.go
 create mode 100644 tinyrender1/main.go

diff --git a/tinyrender1/.gitignore b/tinyrender1/.gitignore
new file mode 100644
index 0000000..6357051
--- /dev/null
+++ b/tinyrender1/.gitignore
@@ -0,0 +1 @@
+tinyrender1
diff --git a/tinyrender1/go.mod b/tinyrender1/go.mod
new file mode 100644
index 0000000..e920698
--- /dev/null
+++ b/tinyrender1/go.mod
@@ -0,0 +1,3 @@
+module tinyrender1
+
+go 1.22.5
diff --git a/tinyrender1/image.go b/tinyrender1/image.go
new file mode 100644
index 0000000..c2d2bdf
--- /dev/null
+++ b/tinyrender1/image.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Convert rgb to uint
+func Col2Uint(r, g, b byte) uint {
+	return (uint(r) << 16) | (uint(g) << 8) | uint(b)
+}
+
+// Convert uint to rgb (in that order)
+func Uint2Col(col uint) (byte, byte, byte) {
+	return byte((col >> 16) & 0xFF), byte((col >> 8) & 0xFF), byte(col & 0xFF)
+}
+
+// Color is in ARGB (alpha not used right now)
+type Framebuffer struct {
+	Data   []uint
+	Width  uint
+	Height uint
+}
+
+// Create a new framebuffer for the given width and height.
+func NewFramebuffer(width uint, height uint) Framebuffer {
+	return Framebuffer{
+		Data:   make([]uint, width*height),
+		Width:  width,
+		Height: height,
+	}
+}
+
+// Given some image data, return a string that is the ppm of it
+func (fb *Framebuffer) ExportPPM() string {
+	var result strings.Builder
+	result.WriteString(fmt.Sprintf("P3\n%d %d\n255\n", fb.Width, fb.Height))
+	for y := range fb.Height {
+		for x := range fb.Width {
+			r, g, b := Uint2Col(fb.Data[x+y*fb.Width])
+			result.WriteString(fmt.Sprintf("%d %d %d\t", r, g, b))
+		}
+		result.WriteRune('\n')
+	}
+	return result.String()
+}
diff --git a/tinyrender1/main.go b/tinyrender1/main.go
new file mode 100644
index 0000000..142a7ec
--- /dev/null
+++ b/tinyrender1/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"log"
+)
+
+const (
+	Width  = 512
+	Height = 512
+)
+
+func main() {
+	log.Printf("Program start")
+	fb := NewFramebuffer(Width, Height)
+	fmt.Print(fb.ExportPPM())
+	log.Printf("Program end")
+}