step

examples/shaders/model_shader/glsl330/base.vs

@@ -0,0 +1,26 @@
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec4 fragColor;
+
+// NOTE: Add here your custom variables 
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}

examples/shaders/model_shader/glsl330/grayscale.fs

@@ -0,0 +1,26 @@
+#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;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord)*colDiffuse*fragColor;
+    
+    // Convert texel color to grayscale using NTSC conversion weights
+    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
+    
+    // Calculate final fragment color
+    finalColor = vec4(gray, gray, gray, texelColor.a);
+}

examples/shaders/model_shader/main.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	rl.SetConfigFlags(rl.FlagMsaa4xHint) // Enable Multi Sampling Anti Aliasing 4x (if available)
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - model shader")
+
+	camera := rl.Camera{}
+	camera.Position = rl.NewVector3(3.0, 3.0, 3.0)
+	camera.Target = rl.NewVector3(0.0, 1.5, 0.0)
+	camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
+	camera.Fovy = 45.0
+
+	dwarf := rl.LoadModel("dwarf.obj")                                 // Load OBJ model
+	texture := rl.LoadTexture("dwarf_diffuse.png")                     // Load model texture
+	shader := rl.LoadShader("glsl330/base.vs", "glsl330/grayscale.fs") // Load model shader
+
+	rl.SetMaterialTexture(dwarf.Materials, rl.MapDiffuse, texture)
+	dwarf.Materials.Shader = shader // Set shader effect to 3d model
+
+	position := rl.NewVector3(0.0, 0.0, 0.0) // Set model position
+
+	rl.SetCameraMode(camera, rl.CameraFree) // Set free camera mode
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+		rl.UpdateCamera(&camera) // Update camera
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.BeginMode3D(camera)
+
+		rl.DrawModel(dwarf, position, 2.0, rl.White) // Draw 3d model with texture
+
+		rl.DrawGrid(10, 1.0) // Draw a grid
+
+		rl.EndMode3D()
+
+		rl.DrawText("(c) Dwarf 3D model by David Moreno", screenWidth-200, screenHeight-20, 10, rl.Gray)
+
+		rl.DrawText(fmt.Sprintf("Camera position: (%.2f, %.2f, %.2f)", camera.Position.X, camera.Position.Y, camera.Position.Z), 600, 20, 10, rl.Black)
+		rl.DrawText(fmt.Sprintf("Camera target: (%.2f, %.2f, %.2f)", camera.Target.X, camera.Target.Y, camera.Target.Z), 600, 40, 10, rl.Gray)
+
+		rl.DrawFPS(10, 10)
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadShader(shader)   // Unload shader
+	rl.UnloadTexture(texture) // Unload texture
+	rl.UnloadModel(dwarf)     // Unload model
+
+	rl.CloseWindow()
+}