New Asset iteration

Signed-off-by: Robear Selwans <robear.selwans@outlook.com>

assets/shaders/_builtins/constants.glsl

@@ -0,0 +1,6 @@
+#ifndef EV_GLSL_CONSTANTS_H
+#define EV_GLSL_CONSTANTS_H
+
+#define PI 3.1415926538
+
+#endif

assets/shaders/_builtins/srgb_ops.glsl

@@ -0,0 +1,22 @@
+#ifndef EV_GLSL_SRGB_OPS_H
+#define EV_GLSL_SRGB_OPS_H
+
+vec4 LinearToSRGB(vec4 linearRGB)
+{
+    bvec4 cutoff = lessThan(linearRGB, vec4(0.0031308));
+    vec4 higher = vec4(1.055)*pow(linearRGB, vec4(1.0/2.4)) - vec4(0.055);
+    vec4 lower = linearRGB * vec4(12.92);
+
+    return mix(higher, lower, cutoff);
+}
+
+vec4 SRGBToLinear(vec4 sRGB)
+{
+    bvec4 cutoff = lessThan(sRGB, vec4(0.04045));
+    vec4 higher = pow((sRGB + vec4(0.055))/vec4(1.055), vec4(2.4));
+    vec4 lower = sRGB/vec4(12.92);
+
+    return mix(higher, lower, cutoff);
+}
+
+#endif

assets/shaders/_builtins/types.glsl

@@ -0,0 +1,26 @@
+#ifndef EV_GLSL_TYPES_H
+#define EV_GLSL_TYPES_H
+
+struct Material {
+  vec4 baseColor;
+  uint albedoTexture;
+
+  uint normalTexture;
+
+  float metallicFactor;
+  float roughnessFactor;
+  uint metallicRoughnessTexture;
+
+  vec4 emissiveFactor;
+  uint emissiveTexture;
+};
+
+struct Vertex {
+  vec4 position;
+  vec4 normal;
+  vec2 uv[2];
+  vec4 tangent;
+  vec4 bitangent; // No longer needed. // TODO remove
+};
+
+#endif