From c7bdd6fcae58e09597071405c1449df64e084c51 Mon Sep 17 00:00:00 2001
From: knolax <1339802534.kk@gmail.com>
Date: Wed, 22 Feb 2017 20:43:47 -0500
Subject: implemented phoung shading and surrounding infrastructure, gen.cpp
 compiles a simple program that creates raw vertex data from vertexes in a way
 that surppassess the limitations of opengl's native elements[] protocol. next
 step is to allow for z distance based override and multi draw;

---
 example/fragmentshader.glsl |  21 ++++++++++++++++++++-
 example/main                | Bin 49192 -> 49488 bytes
 example/main.cpp            |   2 ++
 example/main.o              | Bin 4424 -> 4752 bytes
 example/vertexshader.glsl   |  10 ++++++++--
 5 files changed, 30 insertions(+), 3 deletions(-)

(limited to 'example')

diff --git a/example/fragmentshader.glsl b/example/fragmentshader.glsl
index d15860a..70c55b5 100644
--- a/example/fragmentshader.glsl
+++ b/example/fragmentshader.glsl
@@ -1,6 +1,25 @@
 #version 130
 out vec4 outpix;
+uniform vec3 campos;
+uniform vec3 lightpos;
+//varing blends them it is transformed to world space
+varying vec4 fragpos;
+varying vec4 fragnormal;
 void main() 
 {
-	outpix = vec4(1.0, 0.0, 0.0, 0.5);
+	vec3 lightnormal = normalize((lightpos - vec3(fragpos.x, fragpos.y, fragpos.z)));
+	float diffuse = dot(lightnormal, vec3(fragnormal.x, fragnormal.y, fragnormal.z));
+	if (diffuse < 0.0) {
+		diffuse = 0.0;
+	}
+	vec3 camnormal = normalize(campos - vec3(fragpos.x, fragpos.y, fragpos.z));
+	float reflect = dot(camnormal, fragnormal.xyz);
+	diffuse = pow(diffuse, 2.0);
+	reflect = pow(reflect, 2.0);
+	float light = .4 * reflect + .6 * diffuse;
+	//this should be the vertex in camera space without the w value
+	//outpix = gl_FragCoord;
+	outpix = vec4(light * 1.0,light *  1.0,light * 1.0, 1.0);
+	//outpix = vec4(fragpos.x ,fragpos.y ,fragpos.z, 0.5);
+	//outpix = vec4(fragnormal.x, fragnormal.y, fragnormal.z, 0.5);
 }
diff --git a/example/main b/example/main
index 5d3327b..e4895a1 100755
Binary files a/example/main and b/example/main differ
diff --git a/example/main.cpp b/example/main.cpp
index 0748ace..05777a4 100644
--- a/example/main.cpp
+++ b/example/main.cpp
@@ -11,6 +11,8 @@ int main (int argc, char * argv[]) {
 	//inits program
 	initgfx(400,600, "rotating cube");
 	initglgfx();
+	setlight(0,10,10);
+	setcam(0.0,0.0,1.0, 0.0,0.0,0.0, 0.0,1.0,0.0);
 	//main loop, this is defined in main.h and global
 	loop = 1;
 	while(loop) {
diff --git a/example/main.o b/example/main.o
index 5b75d16..37c8220 100644
Binary files a/example/main.o and b/example/main.o differ
diff --git a/example/vertexshader.glsl b/example/vertexshader.glsl
index 4187969..f60ec9f 100644
--- a/example/vertexshader.glsl
+++ b/example/vertexshader.glsl
@@ -2,9 +2,15 @@
 uniform mat4 proj;
 uniform mat4 tran;
 uniform mat4 cam;
+uniform mat4 rot;
 in vec3 position;
-
+in vec3 vnormal;
+varying vec4 fragpos;
+varying vec4 fragnormal; // if this needs to not be blended jsut have all vertexes in a poly be the same
 void main() 
 {
-         gl_Position = proj * cam * tran * vec4(position, 1.0f);
+	//this is the actual position
+        gl_Position = proj * cam * tran * vec4(position, 1.0f);// -  vec4(gl_Normal, 1.0f);
+	fragpos = tran * vec4(position, 1.0f);
+	fragnormal = (tran * vec4(vnormal, 1.0f)) - (tran * vec4(0.0, 0.0, 0.0, 1.0));
 }
-- 
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