it works

gen.py

@@ -1,11 +0,0 @@
-# Create a 400x400 PPM image filled with red color
-width = 400
-height = 400
-max_color = 255
-
-with open("red_image.ppm", "w") as f:
-    f.write(f"P3\n{width} {height}\n{max_color}\n")
-    for i in range(height):
-        for j in range(width):
-            f.write(f"{max_color} 0 0 ")  # Red color
-        f.write("\n")

main.odin

@@ -32,19 +32,17 @@ main :: proc() {
 	}
 	ppm_parse(&file)
 
-	window_width: i32 = 0; if i32(file.width) < WINDOW_WIDTH_MIN {window_width = WINDOW_WIDTH_MIN}
-	window_height: i32 = 0; if i32(file.height) < WINDOW_WIDTH_MIN {window_height = WINDOW_HEIGHT_MIN}
-
-	fmt.println(file.magic_num)
-	fmt.printfln("width: %d", file.width)
-	fmt.printfln("height: %d", file.height)
-	fmt.printfln("max_col_val: %d", file.max_col_val)
+	window_width: i32 = i32(
+		file.width,
+	); if i32(file.width) < WINDOW_WIDTH_MIN {window_width = WINDOW_WIDTH_MIN}
+	window_height: i32 = i32(
+		file.width,
+	); if i32(file.height) < WINDOW_WIDTH_MIN {window_height = WINDOW_HEIGHT_MIN}
 
 	sdl_init_error := SDL.Init(SDL.INIT_VIDEO)
 	assert(sdl_init_error == 0, SDL.GetErrorString())
+
 	defer SDL.Quit()
-
-
 	window := SDL.CreateWindow(
 		WINDOW_TITLE,
 		SDL.WINDOWPOS_CENTERED,
@@ -59,9 +57,27 @@ main :: proc() {
 
 	surface := SDL.GetWindowSurface(window)
 
-	colour_skyblue := SDL.MapRGB(surface.format, 42, 42, 42)
-	SDL.FillRect(surface, nil, colour_skyblue)
+	colour_bg := SDL.MapRGB(surface.format, 42, 42, 42)
+	SDL.FillRect(surface, nil, colour_bg)
 
+	i := 0
+	pixel := SDL.Rect{0, 0, 1, 1}
+
+	for y: i32 = 0; y < i32(file.height); y += 1 {
+		for x: i32 = 0; x < i32(file.width); x += 1 {
+			red: u8
+			green: u8
+			blue: u8
+			red = file.pixels[i].red
+			green = file.pixels[i].green
+			blue = file.pixels[i].blue
+			pixel.x = x
+			pixel.y = y
+
+			SDL.FillRect(surface, &pixel, SDL.MapRGB(surface.format, red, green, blue))
+			i += 1
+		}
+	}
 	SDL.UpdateWindowSurface(window)
 
 	//Loop!

ppm.odin

@@ -3,6 +3,7 @@ package main
 import "core:c"
 import "core:fmt"
 import "core:os"
+import "core:os/os2"
 import "core:strconv"
 import "core:strings"
 
@@ -11,11 +12,20 @@ PPM_MAGIC_NUMBER :: enum {
 	P3,
 }
 
+Ppm_Pixel :: struct {
+	red:   u8,
+	green: u8,
+	blue:  u8,
+}
+
 Ppm_file :: struct {
-	magic_num: PPM_MAGIC_NUMBER,
-	width:     int,
-	height:    int,
-	data:      []byte,
+	file:        os2.File, //TODO: use this instead perhaps?
+	data:        []byte,
+	magic_num:   PPM_MAGIC_NUMBER,
+	width:       int,
+	height:      int,
+	max_col_val: int,
+	pixels:      []Ppm_Pixel,
 }
 
 load_ppm :: proc(ppm_file: ^Ppm_file, filename: string) -> (success: bool) {
@@ -33,25 +43,77 @@ load_ppm :: proc(ppm_file: ^Ppm_file, filename: string) -> (success: bool) {
 	return true
 }
 
+//TODO: handle errors and err return type (success: bool?, err: ErrorType?)
 ppm_parse :: proc(ppm_file: ^Ppm_file) {
+	magic_num_found := false
+	w_h_found := false
+	max_col_val_found := false
+	sb := strings.builder_make(allocator = context.temp_allocator)
+	defer strings.builder_destroy(&sb)
 
 	it := string(ppm_file.data)
 	for line in strings.split_lines_iterator(&it) {
 		if strings.starts_with(line, "#") {continue} 	//ignore comments
-		if strings.starts_with(line, "P") {
+
+		if !magic_num_found && strings.starts_with(line, "P") {
 			num, _ := strconv.parse_int(strings.trim(line, "P"))
 			if num == 3 {
 				ppm_file.magic_num = .P3
 			} else if num == 6 {
 				ppm_file.magic_num = .P6
 			}
+			magic_num_found = true
+			continue
 		}
 
 		w_h_parts := strings.split(line, " ")
-		if len(w_h_parts) == 2 {
+		if !w_h_found && len(w_h_parts) == 2 {
 			ppm_file.width, _ = strconv.parse_int(w_h_parts[0])
 			ppm_file.height, _ = strconv.parse_int(w_h_parts[1])
+			ppm_file.pixels = make(
+				[]Ppm_Pixel,
+				ppm_file.width * ppm_file.height,
+				context.temp_allocator,
+			)
+			w_h_found = true
+			continue
+		}
 
+		max_val_part := strings.split(line, " ")
+		if !max_col_val_found && len(max_val_part) == 1 {
+			ppm_file.max_col_val, _ = strconv.parse_int(max_val_part[0])
+			max_col_val_found = true
+			continue
+		}
+
+		if magic_num_found && w_h_found && max_col_val_found {
+			for value in strings.split(line, " ") {
+				strings.write_string(&sb, value)
+				strings.write_string(&sb, " ")
+			}
+		}
+	}
+
+	all_values := strings.to_string(sb)
+
+	index := 0
+	pixel_values := strings.split(all_values, " ")
+
+	for i := 0; i < len(pixel_values); i += 3 {
+		if index < len(ppm_file.pixels) {
+			if i + 2 < len(pixel_values) {
+				red_val, _ := strconv.parse_int(pixel_values[i])
+				green_val, _ := strconv.parse_int(pixel_values[i + 1])
+				blue_val, _ := strconv.parse_int(pixel_values[i + 2])
+
+				ppm_file.pixels[index].red = u8(red_val)
+				ppm_file.pixels[index].green = u8(green_val)
+				ppm_file.pixels[index].blue = u8(blue_val)
+
+				index += 1
+			}
+		} else {
+			break
 		}
 	}
 }

sample.ppm

@@ -1,7 +1,7 @@
 P6
 4 4
 255
-0  0  0   100 0  0       0  0  0    255   0 255
-0  0  0    0 255 175     0  0  0     0    0  0
-0  0  0    0  0  0       0 15 175    0    0  0
-255 0 255  0  0  0       0  0  0    255  255 255
+0 0 0 100 0 0 0 0 0 255 0 255
+0 0 0 0 255 175 0 0 0 0 0 0
+0 0 0 0 0 0 0 15 175 0 0 0
+255 0 255 0 0 0 0 0 0 255 255 255