add more texture & shader examples

examples/shaders/texture_drawing/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - texture drawing")
+
+	imBlank := rl.GenImageColor(1024, 1024, rl.Blank)
+	texture := rl.LoadTextureFromImage(imBlank)
+	rl.UnloadImage(imBlank)
+
+	shader := rl.LoadShader("", "cubes_panning.fs")
+
+	time := []float32{0}
+
+	timeLoc := rl.GetShaderLocation(shader, "uTime")
+
+	rl.SetShaderValue(shader, timeLoc, time, rl.ShaderUniformFloat)
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		time = nil
+		time = []float32{float32(rl.GetTime())}
+		rl.SetShaderValue(shader, timeLoc, time, rl.ShaderUniformFloat)
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginShaderMode(shader)
+		rl.DrawTexture(texture, 0, 0, rl.White)
+		rl.EndShaderMode()
+
+		rl.DrawText("BACKGROUND is PAINTED and ANIMATED on SHADER!", 10, 10, 20, rl.Maroon)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader) // Unload shader
+
+	rl.CloseWindow()
+}