From ef37119f4e94c83a6357ebc0b94a39e4e53b20d7 Mon Sep 17 00:00:00 2001
From: ccolin
Date: Sat, 26 Dec 2020 21:46:12 +0100
Subject: add some sunlight

---
 src/opengl_widget.cc | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

(limited to 'src/opengl_widget.cc')

diff --git a/src/opengl_widget.cc b/src/opengl_widget.cc
index ca216b3..42bc612 100644
--- a/src/opengl_widget.cc
+++ b/src/opengl_widget.cc
@@ -7,9 +7,12 @@ static const GLchar *vertex_shader_source = R"glsl(
 #version 330 core
 
 layout(location = 0) in vec3 in_pos;
-layout(location = 1) in vec2 in_uv;
+layout(location = 1) in vec3 in_norm;
+layout(location = 2) in vec2 in_uv;
 
+out vec3 norm;
 out vec2 uv;
+out vec3 frag_pos;
 
 uniform mat4 proj;
 uniform mat4 view;
@@ -17,20 +20,32 @@ uniform mat4 model;
 
 void main() {
 	gl_Position = proj * view * model * vec4(in_pos, 1.0);
+	norm = in_norm;
 	uv = in_uv;
+	frag_pos = vec3(model * vec4(in_pos, 1.0));
 }
 )glsl";
 
 static const GLchar *fragment_shader_source = R"glsl(
 #version 330 core
 
+in vec3 norm;
 in vec2 uv;
+in vec3 frag_pos;
+
 out vec4 final_col;
 
 uniform sampler2D tex;
 
 void main() {
-	final_col = texture(tex, uv);
+	vec3 light_col = vec3(1, .964, .783);
+	vec3 ambient = light_col * .2;
+
+	vec3 light_dir = normalize(vec3(5, 10, -8));
+	float diff = max(dot(normalize(norm), light_dir), 0.0);
+	vec3 diffuse = diff * light_col;
+
+	final_col = texture(tex, uv) * vec4(ambient + diffuse, 1);
 }
 )glsl";
 
@@ -139,7 +154,7 @@ void OpenGLWidget::initializeGL() {
 
 void OpenGLWidget::resizeGL(int w, int h) {
 	QMatrix4x4 projection;
-	projection.perspective(FOV, (float) w/h, .1, 1000);
+	projection.perspective(FOV, (float) w/h, .01, 1000);
 	glUniformMatrix4fv(proj_attr, 1, GL_FALSE, projection.data());
 }
 
-- 
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