Start first task

.vscode/settings.json

@@ -1 +1,6 @@
-{}
+{
+    "files.associations": {
+        "bitset": "cpp",
+        "chrono": "cpp"
+    }
+}

exercise2/glsl/old_sky.frag

@@ -0,0 +1,21 @@
+// This source code is property of the Computer Graphics and Visualization 
+// chair of the TU Dresden. Do not distribute! 
+// Copyright (C) CGV TU Dresden - All Rights Reserved
+#version 330
+
+out vec4 color;
+
+in vec4 clipPos;
+
+const vec4 horizon = vec4(0.85, 0.85, 0.8, 1.0);
+const vec4 floor = vec4(0.1, 0.1, 0.1, 1.0);
+const vec4 sky = vec4(0.5, 0.6, 0.8, 1.0);
+
+void main()
+{
+	float h = normalize(clipPos.xyz).y;
+	if(h < 0)
+		color = mix(horizon, floor, pow(-h, 0.5));
+	else
+		color = mix(horizon, sky, pow(h, 0.9));
+}

exercise2/glsl/old_sky.vert

@@ -0,0 +1,19 @@
+// This source code is property of the Computer Graphics and Visualization 
+// chair of the TU Dresden. Do not distribute! 
+// Copyright (C) CGV TU Dresden - All Rights Reserved
+#version 330
+
+uniform mat4 mvp;
+
+out vec4 clipPos;
+
+void main()
+{
+    clipPos = vec4(		float((gl_VertexID << 1) & 2) - 1.0,
+                        float((gl_VertexID +  1) & 2) - 1.0,
+                        float( gl_VertexID       & 2) - 1.0,
+                        1.0);
+
+	gl_Position = mvp * clipPos;
+	gl_Position.z = 0.5 * gl_Position.w;
+}

exercise2/glsl/old_terrain.frag

@@ -0,0 +1,49 @@
+// This source code is property of the Computer Graphics and Visualization 
+// chair of the TU Dresden. Do not distribute! 
+// Copyright (C) CGV TU Dresden - All Rights Reserved
+#version 330
+
+
+
+out vec4 color;
+
+uniform vec3 cameraPos;
+
+
+uniform sampler2D background;
+uniform vec2 screenSize;
+
+const vec3 dirToLight = normalize(vec3(1, 3, 1));	
+
+//Calculates the visible surface color based on the Blinn-Phong illumination model
+vec4 calculateLighting(vec4 materialColor, float specularIntensity, vec3 normalizedNormal, vec3 directionToViewer)
+{
+	vec4 color = materialColor;
+	vec3 h = normalize(dirToLight + directionToViewer);
+	color.xyz *= 0.9 * max(dot(normalizedNormal, dirToLight), 0) + 0.1;
+	color.xyz += specularIntensity * pow(max(dot(h, normalizedNormal), 0), 50);
+	return color;
+}
+
+vec4 getBackgroundColor()
+{
+	return texture(background, gl_FragCoord.xy / screenSize);
+}
+
+void main()
+{
+	//surface geometry
+	vec3 n = vec3(0, 1, 0);
+	vec3 dirToViewer = vec3(0, 1, 0);
+
+	//material properties	
+	color = vec4(0.6, 0.6, 0.6, 1);
+	float specular = 0;
+
+	
+
+	//Calculate light
+	color = calculateLighting(color, specular, n, dirToViewer);
+
+	
+}

exercise2/glsl/old_terrain.vert

@@ -0,0 +1,58 @@
+// This source code is property of the Computer Graphics and Visualization 
+// chair of the TU Dresden. Do not distribute! 
+// Copyright (C) CGV TU Dresden - All Rights Reserved
+#version 330
+
+in vec4 position;
+
+
+
+uniform mat4 mvp;
+
+//Returns the height of the procedural terrain at a given xz position
+float getTerrainHeight(vec2 p);
+
+
+
+void main()
+{
+	gl_Position = mvp * position;
+}
+
+//source: https://gist.github.com/patriciogonzalezvivo/670c22f3966e662d2f83
+float rand(vec2 c)
+{
+	return 2 * fract(sin(dot(c.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;
+}
+
+float perlinNoise(vec2 p )
+{
+	vec2 ij = floor(p);
+	vec2 xy = p - ij;
+	//xy = 3.*xy*xy-2.*xy*xy*xy;
+	xy = .5*(1.-cos(3.1415926 * xy));
+	float a = rand((ij+vec2(0.,0.)));
+	float b = rand((ij+vec2(1.,0.)));
+	float c = rand((ij+vec2(0.,1.)));
+	float d = rand((ij+vec2(1.,1.)));
+	float x1 = mix(a, b, xy.x);
+	float x2 = mix(c, d, xy.x);
+	return mix(x1, x2, xy.y);
+}
+
+//based on https://www.seedofandromeda.com/blogs/58-procedural-heightmap-terrain-generation
+float getTerrainHeight(vec2 p)
+{
+	float total = 0.0;
+	float maxAmplitude = 0.0;
+	float amplitude = 1.0;
+	float frequency = 0.02;
+	for (int i = 0; i < 11; i++) 
+	{
+		total +=  ((1.0 - abs(perlinNoise(p * frequency))) * 2.0 - 1.0) * amplitude;
+		frequency *= 2.0;
+		maxAmplitude += amplitude;
+		amplitude *= 0.45;
+	}
+	return 15 * total / maxAmplitude;
+}

exercise2/glsl/sky.frag

@@ -1,7 +1,7 @@
+#version 330
 // This source code is property of the Computer Graphics and Visualization 
 // chair of the TU Dresden. Do not distribute! 
 // Copyright (C) CGV TU Dresden - All Rights Reserved
-#version 330
 
 out vec4 color;
 

exercise2/glsl/sky.vert

@@ -1,7 +1,7 @@
+#version 330
 // This source code is property of the Computer Graphics and Visualization 
 // chair of the TU Dresden. Do not distribute! 
 // Copyright (C) CGV TU Dresden - All Rights Reserved
-#version 330
 
 uniform mat4 mvp;
 

exercise2/glsl/terrain.frag

@@ -1,9 +1,7 @@
-// This source code is property of the Computer Graphics and Visualization 
+#version 330
+// This source code is property of the Computer Graphics and Visualization 
 // chair of the TU Dresden. Do not distribute! 
 // Copyright (C) CGV TU Dresden - All Rights Reserved
-#version 330
-
-
 
 out vec4 color;
 

exercise2/glsl/terrain.vert

@@ -1,7 +1,7 @@
-// This source code is property of the Computer Graphics and Visualization 
+#version 330
+// This source code is property of the Computer Graphics and Visualization 
 // chair of the TU Dresden. Do not distribute! 
 // Copyright (C) CGV TU Dresden - All Rights Reserved
-#version 330
 
 in vec4 position;
 

exercise2/src/Viewer.cpp

@@ -86,12 +86,35 @@ void Viewer::CreateGeometry()
 	/*Generate positions and indices for a terrain patch with a
 	  single triangle strip */
 
+	for (int i = 0; i < PATCH_SIZE; i++) {
+		for (int j = 0; j < PATCH_SIZE; j++) {
+			positions.emplace_back((float)i, (float)j, 0.0f, 1.0f);
+		}
+	}
+
+	// full x direction, we skip x = 255 inside the loop
+	// decrease y direction by 1
+	int count = (PATCH_SIZE) * (PATCH_SIZE-1);
+
+	for (int k = 0; k < count; k++) {
+
+		// skip creating triangles on last x in row
+		int end_of_x = k % (PATCH_SIZE-1);
+
+		if (end_of_x == 0) {
+			continue;
+		}
+
+		indices.emplace_back(k);
+		indices.emplace_back(k + PATCH_SIZE);
+		indices.emplace_back(k + PATCH_SIZE + 1);
+		indices.emplace_back(k + 1);
+	}
+
 	terrainShader.bind();
 	terrainPositions.uploadData(positions).bindToAttribute("position");
 	terrainIndices.uploadData(indices.size() * sizeof(uint32_t), indices.data());
 
-	
-
 	//textures
 	grassTexture = CreateTexture((unsigned char*)grass_jpg, grass_jpg_size);
 	rockTexture = CreateTexture((unsigned char*)rock_jpg, rock_jpg_size);
@@ -176,7 +199,8 @@ void Viewer::drawContents()
 	terrainShader.setUniform("cameraPos", cameraPosition, false);
 
 	/* Task: Render the terrain */
-
+	glPrimitiveRestartIndex(256);
+	glDrawElements(GL_TRIANGLE_STRIP, (PATCH_SIZE-1) * (PATCH_SIZE-1), GL_UNSIGNED_INT, 0);
 	
 	//Render text
 	nvgBeginFrame(mNVGContext, width(), height(), mPixelRatio);