Initial commit

examples/shaders/custom_uniform/main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	raylib.SetConfigFlags(raylib.FlagMsaa4xHint) // Enable Multi Sampling Anti Aliasing 4x (if available)
+
+	raylib.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - custom uniform variable")
+
+	camera := raylib.Camera{}
+	camera.Position = raylib.NewVector3(3.0, 3.0, 3.0)
+	camera.Target = raylib.NewVector3(0.0, 1.5, 0.0)
+	camera.Up = raylib.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+
+	dwarf := raylib.LoadModel("dwarf.obj")             // Load OBJ model
+	texture := raylib.LoadTexture("dwarf_diffuse.png") // Load model texture
+
+	dwarf.Material.TexDiffuse = texture // Bind texture to model
+
+	position := raylib.NewVector3(0.0, 0.0, 0.0) // Set model position
+
+	shader := raylib.LoadShader("glsl330/base.vs", "glsl330/swirl.fs") // Load postpro shader
+
+	// Get variable (uniform) location on the shader to connect with the program
+	// NOTE: If uniform variable could not be found in the shader, function returns -1
+	swirlCenterLoc := raylib.GetShaderLocation(shader, "center")
+
+	swirlCenter := make([]float32, 2)
+	swirlCenter[0] = float32(screenWidth) / 2
+	swirlCenter[1] = float32(screenHeight) / 2
+
+	// Create a RenderTexture2D to be used for render to texture
+	target := raylib.LoadRenderTexture(screenWidth, screenHeight)
+
+	// Setup orbital camera
+	raylib.SetCameraMode(camera, raylib.CameraOrbital) // Set an orbital camera mode
+
+	raylib.SetTargetFPS(60)
+
+	for !raylib.WindowShouldClose() {
+		// Update
+		//----------------------------------------------------------------------------------
+		mousePosition := raylib.GetMousePosition()
+
+		swirlCenter[0] = mousePosition.X
+		swirlCenter[1] = float32(screenHeight) - mousePosition.Y
+
+		// Send new value to the shader to be used on drawing
+		raylib.SetShaderValue(shader, swirlCenterLoc, swirlCenter, 2)
+
+		raylib.UpdateCamera(&camera) // Update camera
+
+		raylib.BeginDrawing()
+
+		raylib.ClearBackground(raylib.RayWhite)
+
+		raylib.BeginTextureMode(target) // Enable drawing to texture
+
+		raylib.Begin3dMode(camera)
+
+		raylib.DrawModel(dwarf, position, 2.0, raylib.White) // Draw 3d model with texture
+
+		raylib.DrawGrid(10, 1.0) // Draw a grid
+
+		raylib.End3dMode()
+
+		raylib.DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, raylib.Red)
+
+		raylib.EndTextureMode() // End drawing to texture (now we have a texture available for next passes)
+
+		raylib.BeginShaderMode(shader)
+
+		// NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+		raylib.DrawTextureRec(target.Texture, raylib.NewRectangle(0, 0, target.Texture.Width, -target.Texture.Height), raylib.NewVector2(0, 0), raylib.White)
+
+		raylib.EndShaderMode()
+
+		raylib.DrawText("(c) Dwarf 3D model by David Moreno", screenWidth-200, screenHeight-20, 10, raylib.Gray)
+
+		raylib.DrawFPS(10, 10)
+
+		raylib.EndDrawing()
+	}
+
+	raylib.UnloadShader(shader)        // Unload shader
+	raylib.UnloadTexture(texture)      // Unload texture
+	raylib.UnloadModel(dwarf)          // Unload model
+	raylib.UnloadRenderTexture(target) // Unload render texture
+
+	raylib.CloseWindow()
+}