added deferred and mrt shaders

assets/shaders/deferred.frag

@@ -0,0 +1,24 @@
+#version 450
+
+layout(set = 0, binding = 0) uniform sampler2D positionTexture;
+
+layout(set = 0, binding = 1) uniform sampler2D normalTexture;
+
+layout(set = 0, binding = 2) uniform sampler2D albedoTexture;
+
+layout(set = 0, binding = 3) uniform sampler2D specularTexture;
+
+layout (location = 0) in vec2 inUV;
+
+layout(location = 0) out vec4 outColor;
+
+void main()
+{
+  vec3 fragPos = texture(positionTexture, inUV).rgb;
+  vec3 normal = texture(normalTexture, inUV).rgb;
+  vec4 albedo = texture(albedoTexture, inUV);
+
+  // outColor = vec4(fragPos, 1.0);
+  // outColor = vec4(normal, 1.0);
+  outColor = albedo;
+}

assets/shaders/deferred.vert

@@ -0,0 +1,9 @@
+#version 450
+
+layout (location = 0) out vec2 outUV;
+
+void main()
+{
+	outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+	gl_Position = vec4(outUV * 2.0f - 1.0f, 0.0f, 1.0f);
+}

assets/shaders/mrt.frag

@@ -0,0 +1,96 @@
+#version 450
+#extension GL_EXT_nonuniform_qualifier : require
+
+struct Material {
+  vec4 baseColor;
+  uint albedoTexture;
+
+  uint normalTexture;
+
+  float metallicFactor;
+  float roughnessFactor;
+  uint metallicRoughnessTexture;
+};
+
+struct Light {
+  vec3 color;
+  uint intensity;
+};
+
+struct Scene {
+  uint lightsCount;
+};
+
+vec3 directional_light = vec3(1.0);
+
+layout( push_constant ) uniform constants
+{
+	mat4 render_matrix;
+  uint indexBufferIndex;
+  uint vertexBufferIndex;
+  uint materialBufferIndex;
+} PushConstants;
+
+layout(set = 0, binding = 0) uniform SceneData {
+  layout(align = 16) Scene mesh;
+} SceneBuffers[];
+
+layout(set = 0, binding = 1) uniform LightBuffer {
+  layout(align = 16) Light lights[];
+} LightsBuffers;
+
+layout(set = 2, binding = 3) buffer MaterialBuffer {
+  layout(align = 16) Material materials[];
+} MaterialBuffers;
+
+layout(set = 2, binding = 4) uniform sampler2D texSampler[];
+
+layout(location = 0) in vec2 uv;
+layout(location = 1) smooth in mat3 TBN;
+layout(location = 4) in vec4 outpos;
+
+layout (location = 0) out vec4 gPosition;
+layout (location = 1) out vec3 gNormal;
+layout (location = 2) out vec3 gAlbedo;
+
+float near = 0.001;
+float far  = 50.0;
+
+float LinearizeDepth(float depth)
+{
+    float z = depth * 2.0 - 1.0; // back to NDC
+    return (2.0 * near * far) / (far + near - z * (far - near));
+}
+
+void main() {
+  Material material  = MaterialBuffers.materials[ PushConstants.materialBufferIndex ];
+
+  vec3 out_normal;
+  if(material.normalTexture == 0) {
+    out_normal = TBN[2].xyz;
+  } else {
+    vec3 sampled_normal = texture(texSampler[material.normalTexture], uv).rgb;
+    sampled_normal = 2.0 * sampled_normal - vec3(1.0);
+    out_normal = normalize(TBN * sampled_normal);
+  }
+
+
+  float intensity = dot(out_normal, normalize(directional_light)) + 0.2;
+
+  vec3 inColor;
+  if(material.albedoTexture == 0) {
+    inColor = material.baseColor.xyz;
+  } else {
+    inColor = texture(texSampler[material.albedoTexture], uv).xyz;
+  }
+
+  float depth = LinearizeDepth(gl_FragCoord.z) / far; // divide by far for demonstration
+
+  gPosition = outpos;
+  gNormal = out_normal;
+  gAlbedo = inColor;
+  // outColor = vec4(vec3(outpos.z) * 0.5 + 0.5 , 1.0);
+  // outColor = vec4(inColor, 1.0);
+  // outColor = vec4(vec3(intensity), 1.0);
+  // outColor = vec4(out_normal, 1.0);
+}

assets/shaders/mrt.vert

@@ -0,0 +1,86 @@
+#version 450
+#extension GL_EXT_nonuniform_qualifier : require
+
+struct Material {
+  vec4 baseColor;
+  uint albedoTexture;
+
+  uint normalTexture;
+
+  float metallicFactor;
+  float roughnessFactor;
+  uint metallicRoughnessTexture;
+};
+
+struct Vertex {
+  vec4 position;
+  vec4 normal;
+  vec2 uv[2];
+  vec4 tangent;
+  vec4 bitangent; // No longer needed. // TODO remove
+};
+
+struct Light {
+  vec3 color;
+  uint intensity;
+};
+
+struct Scene {
+  uint lightsCount;
+};
+
+struct Mesh {
+  uint asd;
+};
+
+layout( push_constant ) uniform constants
+{
+	mat4 render_matrix;
+  uint indexBufferIndex;
+  uint vertexBufferIndex;
+  uint materialBufferIndex;
+} PushConstants;
+
+layout(set = 1, binding = 0) uniform CameraParam {
+  mat4 projection;
+  mat4 view;
+} Camera;
+
+layout(set = 2, binding = 0) buffer MeshBuffer {
+  layout(align = 16) Mesh mesh;
+} MeshBuffers[];
+
+layout(set = 2, binding = 1) buffer VertexBuffer {
+  layout(align = 16) Vertex vertices[];
+} VertexBuffers[];
+
+layout(set = 2, binding = 2) buffer IndexBuffer {
+  uint indices[];
+} IndexBuffers[];
+
+layout(set = 2, binding = 4) uniform sampler2D texSampler[];
+
+layout(location = 0) out vec2 uv;
+layout(location = 1) smooth out mat3 TBN;
+
+layout(location = 4) out vec4 outpos;
+
+void main()
+{
+  uint index = IndexBuffers[ PushConstants.indexBufferIndex ].indices[gl_VertexIndex];
+  Vertex vertex = VertexBuffers[ PushConstants.vertexBufferIndex ].vertices[ index ];
+
+  uv = vertex.uv[0];
+
+  mat3 model = transpose(inverse(mat3(PushConstants.render_matrix)));
+
+  vec3 T = normalize(model * vec3(vertex.tangent));
+  vec3 N = normalize(model * vec3(vertex.normal));
+  vec3 B = normalize(model * vec3(vertex.bitangent));
+  /* T = normalize(T - dot(T, N) * N); // Re-orthoganize T with respect to N */
+  /* vec3 B = normalize(cross(N, T)); */
+  TBN = mat3(T, B, N);
+
+  gl_Position = Camera.projection * Camera.view * PushConstants.render_matrix * vec4(vertex.position.xyz, 1.0);
+  outpos = PushConstants.render_matrix * vec4(vertex.position.xyz, 1.0);
+}