began ppm struct passing

ppm.odin

@@ -0,0 +1,57 @@
+package main
+
+import "core:c"
+import "core:fmt"
+import "core:os"
+import "core:strconv"
+import "core:strings"
+
+PPM_MAGIC_NUMBER :: enum {
+	P6,
+	P3,
+}
+
+Ppm_file :: struct {
+	magic_num: PPM_MAGIC_NUMBER,
+	width:     int,
+	height:    int,
+	data:      []byte,
+}
+
+load_ppm :: proc(ppm_file: ^Ppm_file, filename: string) -> (success: bool) {
+	if !strings.has_suffix(filename, ".ppm") {
+		fmt.eprintfln("ERROR: File %s does not have a valid ppm extention (.ppm)", filename)
+		return false
+	}
+
+	succ: bool
+	ppm_file.data, succ = os.read_entire_file_from_filename(filename, context.temp_allocator)
+	if !succ {
+		fmt.eprintfln("ERROR: Failed to load file: %s ", filename)
+		return false
+	}
+	return true
+}
+
+ppm_parse :: proc(ppm_file: ^Ppm_file) {
+
+	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") {
+			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
+			}
+		}
+
+		w_h_parts := strings.split(line, " ")
+		if 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])
+
+		}
+	}
+}