From 21f3329340ccd9a8c42335f84b34d3f7e4a2e99a Mon Sep 17 00:00:00 2001
From: knolax <1339802534.kk@gmail.com>
Date: Wed, 1 Mar 2017 12:01:41 -0500
Subject: fixed reflection shading and added colored light.

---
 example/fragmentshader.glsl        |  19 ++++++++++++++++---
 example/main                       | Bin 54184 -> 54360 bytes
 example/main.cpp                   |  16 ++++++++--------
 example/main.o                     | Bin 5152 -> 5904 bytes
 example/textures/elevold.bmp       | Bin 0 -> 4000138 bytes
 example/textures/frederickelev.png | Bin 0 -> 19336 bytes
 example/textures/frederickelev.xcf | Bin 0 -> 111015 bytes
 glgfx.cpp                          |  13 ++++++++-----
 glgfx.h                            |   4 ++--
 glgfx.o                            | Bin 62104 -> 62960 bytes
 libglgfx.a                         | Bin 66420 -> 67374 bytes
 11 files changed, 34 insertions(+), 18 deletions(-)
 create mode 100644 example/textures/elevold.bmp
 create mode 100644 example/textures/frederickelev.png
 create mode 100644 example/textures/frederickelev.xcf

diff --git a/example/fragmentshader.glsl b/example/fragmentshader.glsl
index 631ea69..fc7b4c8 100644
--- a/example/fragmentshader.glsl
+++ b/example/fragmentshader.glsl
@@ -2,6 +2,7 @@
 out vec4 outpix;
 uniform vec3 campos;
 uniform vec3 lightpos;
+uniform vec4 lightattrib;
 uniform sampler2D tex;
 uniform sampler2D elev;
 //varing blends them it is transformed to world space
@@ -18,18 +19,30 @@ void main()
 	float diffuse = dot(lightnormal, fragnormal.xyz);
 	if (diffuse < 0.0) {
 		diffuse = 0.0;
+	} else {
 	}
 	vec3 camnormal = normalize(campos - refpos);
-	lightnormal = -normalize((lightpos - refpos)); // this time it is an incoming vector
+	lightnormal = normalize((refpos - lightpos)); // this time it is an incoming vector
 	vec3 refnormal = lightnormal - (2 * dot(lightnormal, fragnormal.xyz) * fragnormal.xyz);
 	float reflect = dot(camnormal, refnormal);
+	if (reflect < 0.0) {
+		reflect = 0.0;
+	} else {
+	}
 	diffuse = pow(diffuse, 2.0);
 	reflect = pow(reflect, 2.0);
-	float light = (elevpix.b) * reflect + elevpix.a * diffuse;
+	float dist = abs(length(difpos - lightpos)) / lightattrib.a;
+	if (dist > 1.0) {
+		dist = 1.0;
+	}
+	dist = 1 - pow(dist, 4.0);
+	float lightr = (elevpix.b) * 1.0 * lightattrib.r * reflect + elevpix.a * 1.0 * dist  *  diffuse;
+	float lightg = (elevpix.b) * 1.0 * lightattrib.g * reflect + elevpix.a * 1.0 * dist  *  diffuse;
+	float lightb = (elevpix.b) * 1.0 * lightattrib.b * reflect + elevpix.a * 1.0 * dist  *  diffuse;
 	vec4 texpix = texture(tex, fragtexcoord);
 	//this should be the vertex in camera space without the w value
 	//outpix = gl_FragCoord;
-	outpix = light * texpix;
+	outpix = vec4(lightr * texpix.r, lightg * texpix.g, lightb * texpix.b, texpix.a);
 	//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 248dc85..9f2411e 100755
Binary files a/example/main and b/example/main differ
diff --git a/example/main.cpp b/example/main.cpp
index a92ce4b..6b7975c 100644
--- a/example/main.cpp
+++ b/example/main.cpp
@@ -11,7 +11,7 @@ int main (int argc, char * argv[]) {
 	//inits program
 	initgfx(400,600, "rotating cube");
 	initglgfx();
-	setlight(0,10,10);
+	setlight(2.0,10.0,3.0, 1.0, 0.5, 0.5, 15.0);
 	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;
@@ -40,19 +40,19 @@ int main (int argc, char * argv[]) {
 		}
 		switch (rot) {
 			case 0:
-				drawmodel(0.0f, 0.0f, -2.0f, dir, 0.0f, 0.0f, 1.0);
-				drawmodel(0.5f, 3.0f, -10.0f, dir, 0.0f, 0.0f, 1.0);
+				drawmodel(0.0f, 0.0f, -2.0f, dir, 0.0f, 0.0f, 1.0, 1.0, 1.0);
+				drawmodel(0.5f, 3.0f, -10.0f, dir, 0.0f, 0.0f, 1.0, 1.0, 1.0);
 			break;
 			case 1:
-				drawmodel(0.0f, 0.0f, -2.0f, 0.0f, dir, 0.0f, 1.0);
-				drawmodel(0.5f, 3.0f, -10.0f, 0.0f, dir, 0.0f, 1.0);
+				drawmodel(0.0f, 0.0f, -2.0f, 0.0f, dir, 0.0f, 1.0, 1.0, 1.0);
+				drawmodel(0.5f, 3.0f, -10.0f, 0.0f, dir, 0.0f, 1.0, 1.0, 1.0);
 			break;
 			case 2:
-				drawmodel(0.0f, 0.0f, -2.0f, 0.0f, 0.0f, dir, 1.0);
-				drawmodel(0.5f, 3.0f, -10.0f, 0.0f, 0.0f, dir, 1.0);
+				drawmodel(0.0f, 0.0f, -2.0f, 0.0f, 0.0f, dir, 1.0, 1.0, 1.0);
+				drawmodel(0.5f, 3.0f, -10.0f, 0.0f, 0.0f, dir, 1.0, 1.0, 1.0);
 			break;
 		}
-		drawmodel(0.0f, -2.0, -5.0,0.0,0.0,0.0,1.0 );
+		drawmodel(0.0f, -2.0, -5.0,0.0,0.0,0.0,10.0, 1.0, 10.0 );
 		updategfx();
 	}
 	quitgfx();
diff --git a/example/main.o b/example/main.o
index 0a41d2f..c6267ba 100644
Binary files a/example/main.o and b/example/main.o differ
diff --git a/example/textures/elevold.bmp b/example/textures/elevold.bmp
new file mode 100644
index 0000000..cb9fec6
Binary files /dev/null and b/example/textures/elevold.bmp differ
diff --git a/example/textures/frederickelev.png b/example/textures/frederickelev.png
new file mode 100644
index 0000000..b3f13b5
Binary files /dev/null and b/example/textures/frederickelev.png differ
diff --git a/example/textures/frederickelev.xcf b/example/textures/frederickelev.xcf
new file mode 100644
index 0000000..8b7cd36
Binary files /dev/null and b/example/textures/frederickelev.xcf differ
diff --git a/glgfx.cpp b/glgfx.cpp
index 7b54254..f3cdec9 100644
--- a/glgfx.cpp
+++ b/glgfx.cpp
@@ -11,6 +11,7 @@ GLint rothandler;
 GLint camhandler;
 GLint camposhandler;
 GLint lightposhandler;
+GLint lightattribhandler;
 //device coordinates
 //      ^
 //    (y+)
@@ -211,6 +212,7 @@ int genshaders() {
 	rothandler = glGetUniformLocation(shaderprogramhandle, "rot");
 	lightposhandler = glGetUniformLocation(shaderprogramhandle, "lightpos");
 	camposhandler = glGetUniformLocation(shaderprogramhandle, "campos");
+	lightattribhandler = glGetUniformLocation(shaderprogramhandle, "lightattrib");
 }
 //opens a filebuffer stream and reads every char
 std::string readfile(char const * filename) {
@@ -237,13 +239,14 @@ int setcam (float cpx, float cpy, float cpz, float clx, float cly, float clz, fl
 	glUniform3fv(camposhandler, 1, glm::value_ptr(glm::vec3(cpx,cpy,cpz)));
 	return 0;
 }
-int setlight (float x, float y, float z) {
-	glUniform3fv(camposhandler, 1, glm::value_ptr(glm::vec3(x,y,z)));	
+int setlight (float x, float y, float z, float r, float g, float b, float lim) {
+	glUniform3fv(lightposhandler, 1, glm::value_ptr(glm::vec3(x,y,z)));	
+	glUniform4fv(lightattribhandler, 1, glm::value_ptr(glm::vec4(r,g,b,lim)));
 	return 0;
 }
 //draws the model, setting perspective transform and position transform
 //done with magic numbers for now for testing purposes
-int drawmodel(float x, float y, float z, float xr, float yr, float zr, float s) {
+int drawmodel(float x, float y, float z, float xr, float yr, float zr, float xs, float ys, float zs) {
 // the transformation matrix = rotation matrix of object * scaling matrix * translaton matrix representing difference in camera and object location * -rotation matrix of the camera * perspective transform
 //order of application ir right to left
 	//fov, aspect ratio, size of near and far planes distance
@@ -258,12 +261,12 @@ int drawmodel(float x, float y, float z, float xr, float yr, float zr, float s)
 	//	glm::vec4(0.0f,0.0f,0.5f,1.0f)  //w just make it 1
 	//);
 	//the translation matrix, matrixes added last are applied first
-	glm::mat4 tran;
-	tran = glm::scale(tran, glm::vec3(s,s,s));
+	glm::mat4 tran;	
 	tran = glm::translate(tran, glm::vec3(x,y,z));
 	tran = glm::rotate(tran,glm::radians(xr),glm::vec3(1,0,0)); // axis of rotation x y z
 	tran = glm::rotate(tran,glm::radians(yr),glm::vec3(0,1,0));
 	tran = glm::rotate(tran,glm::radians(zr),glm::vec3(0,0,1));
+	tran = glm::scale(tran, glm::vec3(xs, ys, zs));
 	glm::mat4 rot;
 	rot = glm::rotate(rot,glm::radians(xr),glm::vec3(1,0,0)); // axis of rotation x y z
 	rot = glm::rotate(rot,glm::radians(yr),glm::vec3(0,1,0));
diff --git a/glgfx.h b/glgfx.h
index ec40f88..8d0137a 100644
--- a/glgfx.h
+++ b/glgfx.h
@@ -11,9 +11,9 @@
 #include <glm/gtc/type_ptr.hpp>
 int initglgfx();
 int genshaders();
-int drawmodel(float x, float y, float z, float xr, float yr, float zr, float s);
+int drawmodel(float x, float y, float z, float xr, float yr, float zr, float xs, float ys, float zs);
 int setcam (float cpx, float cpy, float cpz, float clx, float cly, float clz, float cux, float cuy, float cuz);
-int setlight (float x, float y, float z);
+int setlight (float x, float y, float z, float r, float g, float b, float lim);
 int quitglgfx();
 int clearglgfx();
 int glgfxloadtexture (const char * file);
diff --git a/glgfx.o b/glgfx.o
index 9dcb566..f5a2f42 100644
Binary files a/glgfx.o and b/glgfx.o differ
diff --git a/libglgfx.a b/libglgfx.a
index ed6181a..0dadadc 100644
Binary files a/libglgfx.a and b/libglgfx.a differ
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