From 454b9210c18988e8ccf0e7884e7e269a1d26c5f4 Mon Sep 17 00:00:00 2001
From: Alex Yatskov <alex@foosoft.net>
Date: Fri, 21 Dec 2018 19:44:19 -0800
Subject: [PATCH] adding a simple render test

---
 tools/viewer/main.go | 88 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 70 insertions(+), 18 deletions(-)

diff --git a/tools/viewer/main.go b/tools/viewer/main.go
index 9c7d438..4c774eb 100644
--- a/tools/viewer/main.go
+++ b/tools/viewer/main.go
@@ -1,39 +1,91 @@
 package main
 
-import "github.com/veandco/go-sdl2/sdl"
+import (
+	"image/color"
+	"log"
+	"os"
+
+	"github.com/FooSoft/lazarus/formats/dat"
+	"github.com/FooSoft/lazarus/formats/dc6"
+	"github.com/FooSoft/lazarus/graphics"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+func loadPalette(path string) (*dat.Palette, error) {
+	fp, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer fp.Close()
+	return dat.NewFromReader(fp)
+}
+
+func loadSprite(path string) (*dc6.Sprite, error) {
+	fp, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer fp.Close()
+	return dc6.NewFromReader(fp)
+}
+
+func loadSurface(spritePath, palettePath string) (*sdl.Surface, error) {
+	sprite, err := loadSprite(spritePath)
+	if err != nil {
+		return nil, err
+	}
+
+	palette, err := loadPalette(palettePath)
+	if err != nil {
+		return nil, err
+	}
+
+	frame := sprite.Directions[0].Frames[0]
+	colors := make([]color.RGBA, frame.Width*frame.Height)
+	for y := 0; y < frame.Height; y++ {
+		for x := 0; x < frame.Width; x++ {
+			colors[y*frame.Width+x] = palette.Colors[frame.Data[y*frame.Width+x]]
+		}
+	}
+
+	return graphics.NewSurfaceFromRgba(colors, frame.Width, frame.Height)
+}
 
 func main() {
-	if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
-		panic(err)
-	}
-	defer sdl.Quit()
-
-	window, err := sdl.CreateWindow("test", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
-		800, 600, sdl.WINDOW_SHOWN)
+	window, err := sdl.CreateWindow("Viewer", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, 800, 600, sdl.WINDOW_SHOWN)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	defer window.Destroy()
 
-	surface, err := window.GetSurface()
+	renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
-	surface.FillRect(nil, 0)
+	defer renderer.Destroy()
 
-	rect := sdl.Rect{X: 0, Y: 0, W: 200, H: 200}
-	surface.FillRect(&rect, 0xffff0000)
-	window.UpdateSurface()
+	sprite, err := loadSurface("/home/alex/loadingscreen.dc6", "/home/alex/pal.dat")
+	if err != nil {
+		log.Fatal(err)
+	}
 
-	running := true
-	for running {
+	texture, err := renderer.CreateTextureFromSurface(sprite)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	renderer.Clear()
+	renderer.Copy(texture, &sdl.Rect{0, 0, 256, 256}, &sdl.Rect{0, 0, 256, 256})
+	renderer.Present()
+
+	for running := true; running; {
 		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
 			switch event.(type) {
 			case *sdl.QuitEvent:
-				println("Quit")
 				running = false
 				break
 			}
+			sdl.Delay(1)
 		}
 	}
 }