X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fmaterials%2Fpbrmaterial.cpp;h=7e7bd5cf642dbf5e8c4f93284cea5e1173b47bf4;hb=6b9338845dfee441cd18ad6c633e4feef8ad14e1;hp=7c73996fd2f7b8e91af2ab4eb27d08fd5592de70;hpb=cb7db94f7837e6a3be037d07575dc248177d9426;p=libs%2Fgl.git

diff --git a/source/materials/pbrmaterial.cpp b/source/materials/pbrmaterial.cpp
index 7c73996f..7e7bd5cf 100644
--- a/source/materials/pbrmaterial.cpp
+++ b/source/materials/pbrmaterial.cpp
@@ -1,4 +1,9 @@
+#include "framebuffer.h"
+#include "mesh.h"
 #include "pbrmaterial.h"
+#include "renderer.h"
+#include "resources.h"
+#include "texture2d.h"
 
 using namespace std;
 
@@ -13,10 +18,12 @@ const Tag PbrMaterial::texture_tags[] =
 	Tag("roughness_map"),
 	Tag("occlusion_map"),
 	Tag("emission_map"),
+	Tag("fresnel_lookup"),
 	Tag()
 };
 
-PbrMaterial::PbrMaterial()
+PbrMaterial::PbrMaterial():
+	fresnel_lookup(get_or_create_fresnel_lookup())
 {
 	set_base_color(0.8f);
 	set_metalness(0.0f);
@@ -24,6 +31,36 @@ PbrMaterial::PbrMaterial()
 	set_emission(0.0f);
 }
 
+const Texture2D &PbrMaterial::get_or_create_fresnel_lookup()
+{
+	Resources &resources = Resources::get_global();
+
+	static const string name = "_pbr_env_fresnel_lookup.tex2d";
+	Texture2D *fresnel_lookup = resources.find<Texture2D>(name);
+	if(fresnel_lookup)
+		return *fresnel_lookup;
+
+	fresnel_lookup = new Texture2D;
+	fresnel_lookup->storage(RG8, 128, 128, 1);
+	resources.add(name, fresnel_lookup);
+
+	const Program &shprog = resources.get<Program>("_pbr_fresnel_lookup.glsl.shader");
+	ProgramData shdata;
+	shdata.uniform("n_samples", 1024);
+	// Not actually used here, but put it in to satisfy the interface
+	shdata.uniform("roughness", 0.0f);
+
+	const Mesh &mesh = resources.get<Mesh>("_fullscreen_quad.mesh");
+	Framebuffer fresnel_lookup_fbo;
+	fresnel_lookup_fbo.attach(COLOR_ATTACHMENT0, *fresnel_lookup);
+	Bind bind_fbo(fresnel_lookup_fbo);
+	Renderer renderer;
+	renderer.set_shader_program(&shprog, &shdata);
+	mesh.draw(renderer);
+
+	return *fresnel_lookup;
+}
+
 void PbrMaterial::fill_program_info(string &module_name, map<string, int> &spec_values) const
 {
 	module_name = "cooktorrance.glsl";
@@ -64,6 +101,8 @@ const Texture *PbrMaterial::get_texture(Tag tag) const
 		return occlusion.texture;
 	else if(tag==texture_tags[5])
 		return emission.texture;
+	else if(tag==texture_tags[6])
+		return &fresnel_lookup;
 	else
 		return 0;
 }