add more texture & shader examples

examples/shaders/texture_waves/main.go

@@ -0,0 +1,67 @@
+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 waves")
+
+	texture := rl.LoadTexture("space.png")
+
+	shader := rl.LoadShader("", "wave.fs")
+
+	secondsLoc := rl.GetShaderLocation(shader, "seconds")
+	freqXLoc := rl.GetShaderLocation(shader, "freqX")
+	freqYLoc := rl.GetShaderLocation(shader, "freqY")
+	ampXLoc := rl.GetShaderLocation(shader, "ampX")
+	ampYLoc := rl.GetShaderLocation(shader, "ampY")
+	speedXLoc := rl.GetShaderLocation(shader, "speedX")
+	speedYLoc := rl.GetShaderLocation(shader, "speedY")
+
+	freqX := []float32{25}
+	freqY := []float32{25}
+	ampX := []float32{5}
+	ampY := []float32{5}
+	speedX := []float32{8}
+	speedY := []float32{8}
+
+	screensize := []float32{float32(rl.GetScreenWidth()), float32(rl.GetScreenHeight())}
+
+	rl.SetShaderValue(shader, rl.GetShaderLocation(shader, "size"), screensize, rl.ShaderUniformVec2)
+	rl.SetShaderValue(shader, freqXLoc, freqX, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, freqYLoc, freqY, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, ampXLoc, ampX, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, ampYLoc, ampY, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, speedXLoc, speedX, rl.ShaderUniformFloat)
+	rl.SetShaderValue(shader, speedYLoc, speedY, rl.ShaderUniformFloat)
+
+	seconds := []float32{0}
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		seconds[0] += rl.GetFrameTime()
+		rl.SetShaderValue(shader, secondsLoc, seconds, rl.ShaderUniformFloat)
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginShaderMode(shader)
+		rl.DrawTexture(texture, 0, 0, rl.White)
+		rl.DrawTexture(texture, texture.Width, 0, rl.White)
+		rl.EndShaderMode()
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader)
+	rl.UnloadTexture(texture)
+
+	rl.CloseWindow()
+}

examples/shaders/texture_waves/wave.fs

@@ -0,0 +1,37 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// Output fragment color
+out vec4 finalColor;
+
+uniform float seconds;
+
+uniform vec2 size;
+
+uniform float freqX;
+uniform float freqY;
+uniform float ampX;
+uniform float ampY;
+uniform float speedX;
+uniform float speedY;
+
+void main() {
+    float pixelWidth = 1.0 / size.x;
+    float pixelHeight = 1.0 / size.y;
+    float aspect = pixelHeight / pixelWidth;
+    float boxLeft = 0.0;
+    float boxTop = 0.0;
+
+    vec2 p = fragTexCoord;
+    p.x += cos((fragTexCoord.y - boxTop) * freqX / ( pixelWidth * 750.0) + (seconds * speedX)) * ampX * pixelWidth;
+    p.y += sin((fragTexCoord.x - boxLeft) * freqY * aspect / ( pixelHeight * 750.0) + (seconds * speedY)) * ampY * pixelHeight;
+
+    finalColor = texture(texture0, p)*colDiffuse*fragColor;
+}