From df56b0237ee21a8d9ca7a9a476344510c828d223 Mon Sep 17 00:00:00 2001
From: silva guimaraes <silva__guimaraes@hotmail.com>
Date: Thu, 27 Jul 2023 12:36:01 -0300
Subject: [PATCH] suporte para shaders

---
 main.go    | 84 ++++++++++++++++++++++++++++++++++++++++++++++--------
 windows.sh |  3 ++
 2 files changed, 75 insertions(+), 12 deletions(-)
 create mode 100644 windows.sh

diff --git a/main.go b/main.go
index c88fd50..3519f71 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"math"
+	// "path"
 	"strconv"
 
 	rl "github.com/gen2brain/raylib-go/raylib"
@@ -28,6 +29,7 @@ type game struct {
     bullets []*bullet
     score int
     gameSpeed float32 // 1 = velocidade normal
+    backgroundColor rl.Color
 }
 
 type bullet struct {
@@ -267,6 +269,7 @@ func (e *enemy) update(g *game, index int) {
         e.health -= bullet.dmg
         g.removeBullet(idx)
         enemyColor = rl.White
+        g.backgroundColor = rl.NewColor(20, 20, 20, 255)
     }
 
     if e.health <= 0 {
@@ -348,7 +351,7 @@ func (p *player) checkHit(g *game) {
         // fmt.Println(distance)
 
         if distance < p.hitBoxRadius {
-            fmt.Println("hit!")
+            // fmt.Println("hit!")
         }
     }
 }
@@ -390,8 +393,13 @@ func (p *player) update(g *game) {
 
 func main() {
 
-    state := &game{arenaWidth: 450, arenaHeight: 700, interfaceWidth: 300, gameSpeed: 1}
-
+    state := &game{
+        arenaWidth: 450,
+        arenaHeight: 700,
+        interfaceWidth: 300,
+        gameSpeed: 1,
+        backgroundColor: rl.NewColor(0, 0, 0, 100),
+    }
     player := player{
         pos: rl.Vector2{
             X: float32(state.arenaWidth) / 2, 
@@ -404,10 +412,21 @@ func main() {
         hitBoxRadius: 5,
     }
 
-    rl.SetTraceLog(rl.LogWarning | rl.LogDebug)
+    // rl.SetTraceLog(rl.LogWarning | rl.LogDebug)
+    
+    rl.SetConfigFlags(rl.FlagMsaa4xHint)
 	rl.InitWindow(state.arenaWidth + state.interfaceWidth, state.arenaHeight, "danmaku")
 	rl.SetTargetFPS(60)
 
+
+    // shader_path := path.Join("shaders", "trails.glsl")
+    // shader := rl.LoadShader("", shader_path)
+    // timeShaderLocation := rl.GetShaderLocation(shader, "time")
+    // target := rl.LoadRenderTexture(
+    //     state.arenaWidth + state.interfaceWidth, 
+    //     state.arenaHeight,
+    // )
+
     state.enemies = []*enemy{
         {
             pos: rl.Vector2{X: 200, Y: 200},
@@ -436,11 +455,10 @@ func main() {
 
     for ; !rl.WindowShouldClose(); state.frame += state.gameSpeed {
         rl.BeginDrawing()
-        rl.ClearBackground(rl.Black)
 
-        rl.DrawText("danmaku babe bullet shoot shoot", 20, 20, 20, rl.DarkGray)
-        rl.DrawLine(18, 42, state.arenaWidth-18, 42, rl.Black)
-        rl.DrawFPS(0, 0)
+        // rl.BeginTextureMode(target)
+        rl.ClearBackground(state.backgroundColor)
+        state.backgroundColor = rl.Black
 
         player.update(state)
 
@@ -456,10 +474,6 @@ func main() {
             state.arenaWidth, 0, state.interfaceWidth, state.arenaHeight, 
             rl.NewColor(0, 33, 59, 255),
         )
-        currectScore += (state.score - currectScore) / 11
-		rl.DrawText(strconv.Itoa(currectScore), state.arenaWidth, 0, 50, rl.White)
-
-		rl.DrawText(strconv.Itoa(len(state.bullets)), state.arenaWidth, 50, 50, rl.White)
 
         if player.focusMode {
             state.gameSpeed = 0.3
@@ -467,6 +481,52 @@ func main() {
             state.gameSpeed = 1
         }
 
+        // rl.EndTextureMode()
+
+        // { // shaders
+        //     if rl.IsKeyPressed(rl.KeyF2) {
+        //         shader = rl.LoadShader("", shader_path)
+        //         fmt.Println("reloaded shader")
+        //     }
+        //
+        //     rl.SetShaderValue(
+        //         shader, timeShaderLocation, []float32{float32(rl.GetTime())}, 
+        //         rl.ShaderUniformFloat,
+        //     )
+        //     rl.BeginShaderMode(shader)
+        //     // NOTE: Render texture must be y-flipped due to default 
+        //     // OpenGL coordinates (left-bottom)
+        //     rl.DrawTextureRec(
+        //         target.Texture, 
+        //         rl.NewRectangle(
+        //             0, 0, float32(target.Texture.Width), float32(-target.Texture.Height),
+        //         ), 
+        //         rl.NewVector2(0, 0), rl.White,
+        //     )
+        //
+        //     rl.EndShaderMode()
+        // }
+
+        { // UI
+            currectScore += (state.score - currectScore) / 11
+            rl.DrawText(strconv.Itoa(currectScore), state.arenaWidth, 0, 50, rl.White)
+
+            rl.DrawText(
+                strconv.Itoa(len(state.bullets)), state.arenaWidth, 50, 50, rl.White,
+            )
+
+            rl.DrawText(
+                fmt.Sprintf("%f", state.frame), state.arenaWidth, 100, 50, rl.White,
+            )
+            rl.DrawText(
+                fmt.Sprintf("%d", int(state.frame)), state.arenaWidth, 150, 50, rl.White,
+            )
+            rl.DrawText("danmaku babe bullet shoot shoot", 20, 20, 20, rl.DarkGray)
+            rl.DrawLine(18, 42, state.arenaWidth-18, 42, rl.Black)
+            rl.DrawFPS(0, 0)
+        }
+
+        
 		rl.EndDrawing()
 	}
 
diff --git a/windows.sh b/windows.sh
new file mode 100644
index 0000000..f3ece73
--- /dev/null
+++ b/windows.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows GOARCH=amd64 CGO_LDFLAGS="-static-libgcc -static -lpthread" go build