Default cameras

shaders/shader.vert

@@ -6,6 +6,8 @@ layout(location = 2) in vec2 inUV;
 
 layout(binding = 0) uniform UniformBufferObject {
         mat4 model;
+        mat4 view;
+        mat4 projection;
 } ubo;
 
 layout(location = 0) out vec3 fragColor;
@@ -23,6 +25,6 @@ vec3 colors[3] = vec3[] (
 );
 
 void main() {
-    gl_Position = ubo.model * vec4(inPosition, 1.0);
-    fragColor = inNormal;
+    gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPosition, 1.0);
+    fragColor = clamp(inNormal, vec3(0.0), vec3(1.0));
 }

src/main.cpp

@@ -31,8 +31,8 @@ struct Vertex {
 
 struct UniformBufferObject {
     glm::mat4 model;
-    //glm::mat4 view;
-    //glm::mat4 proj;
+    glm::mat4 view;
+    glm::mat4 proj;
 };
 
 VkResult CreateDebugUtilsMessengerEXT(VkInstance instance, const VkDebugUtilsMessengerCreateInfoEXT* pCreateInfo,
@@ -158,6 +158,9 @@ private:
     std::vector<std::vector<Vertex>> vertices;
     std::vector<std::vector<uint32_t>> indices;
     std::vector<glm::mat4x4> worldMatrices;
+    glm::mat4x4 viewMatrix;
+    glm::mat4x4 projectionMatrix;
+
     std::vector<VkBuffer> vertexBuffer;
     std::vector<VkDeviceMemory> vertexBufferMemory;
     std::vector<VkBuffer> indexBuffer;
@@ -294,6 +297,10 @@ private:
                     worldMatrices.push_back(transform);
                 }
 
+                if (node.camera == 0) {
+                    viewMatrix = glm::inverse(transform);
+                }
+
                 processNodes(node.children, transform);
             }
         };
@@ -357,6 +364,27 @@ private:
                 throw std::runtime_error("Failed to load GLTF: " + err);
             }
 
+            viewMatrix = glm::mat4x4(1);
+            projectionMatrix = glm::mat4x4(1);
+            //glm::perspectiveFovLH(60.f, static_cast<float>(WIDTH), static_cast<float>(HEIGHT), 0.001f, 1000.f);
+            if (model.cameras.size() > 0)
+            {
+                const auto& camera = model.cameras[0];
+                if (camera.type == "perspective")
+                {   
+                    projectionMatrix = glm::perspectiveRH(camera.perspective.yfov, camera.perspective.aspectRatio, camera.perspective.znear, camera.perspective.zfar);
+                }
+                if (camera.type == "orthographic")
+                {
+                    auto right = camera.orthographic.xmag / 2.f;
+                    auto left = - right;
+                    auto top = camera.orthographic.ymag / 2.f;
+                    auto bottom = - top;
+                    projectionMatrix = glm::orthoRH(left, right, bottom, top, camera.orthographic.znear, camera.orthographic.zfar);
+                }
+            }
+            projectionMatrix[1][1] *= -1.0f;
+
             processNodes(model.scenes[0].nodes, glm::mat4x4(1));
 
             std::cout << "Loaded " << vertices.size() << " vertices, "
@@ -1204,6 +1232,8 @@ private:
         {
             UniformBufferObject ubo{};
             ubo.model = worldMatrices[i];
+            ubo.view = viewMatrix;
+            ubo.proj = projectionMatrix;
             memcpy(uniformBuffersMapped[i], &ubo, sizeof(ubo));
         }