add more texture & shader examples

examples/shaders/texture_drawing/cubes_panning.fs

@@ -0,0 +1,61 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+// Custom variables
+#define PI 3.14159265358979323846
+uniform float uTime = 0.0;
+
+float divisions = 5.0;
+float angle = 0.0;
+
+vec2 VectorRotateTime(vec2 v, float speed)
+{
+    float time = uTime*speed;
+    float localTime = fract(time);  // The time domain this works on is 1 sec.
+
+    if ((localTime >= 0.0) && (localTime < 0.25)) angle = 0.0;
+    else if ((localTime >= 0.25) && (localTime < 0.50)) angle = PI/4*sin(2*PI*localTime - PI/2);
+    else if ((localTime >= 0.50) && (localTime < 0.75)) angle = PI*0.25;
+    else if ((localTime >= 0.75) && (localTime < 1.00)) angle = PI/4*sin(2*PI*localTime);
+
+    // Rotate vector by angle
+    v -= 0.5;
+    v =  mat2(cos(angle), -sin(angle), sin(angle), cos(angle))*v;
+    v += 0.5;
+
+    return v;
+}
+
+float Rectangle(in vec2 st, in float size, in float fill)
+{
+  float roundSize = 0.5 - size/2.0;
+  float left = step(roundSize, st.x);
+  float top = step(roundSize, st.y);
+  float bottom = step(roundSize, 1.0 - st.y);
+  float right = step(roundSize, 1.0 - st.x);
+
+  return (left*bottom*right*top)*fill;
+}
+
+void main()
+{
+    vec2 fragPos = fragTexCoord;
+    fragPos.xy += uTime/9.0;
+
+    fragPos *= divisions;
+    vec2 ipos = floor(fragPos);  // Get the integer coords
+    vec2 fpos = fract(fragPos);  // Get the fractional coords
+
+    fpos = VectorRotateTime(fpos, 0.2);
+
+    float alpha = Rectangle(fpos, 0.216, 1.0);
+    vec3 color = vec3(0.3, 0.3, 0.3);
+
+    finalColor = vec4(color, alpha);
+}

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()
+}