generate mesh from points using geometry shader

shaders/shader-texture.fs

@@ -2,29 +2,29 @@
 
 out vec4 FragColor;
 
-in vec3 vNormal;
-in vec3 vTexCoord;
+in vec3 TexCoord;
+in vec3 Normal;
 in vec3 FragPos;
 
 vec3 lightColor = vec3(1.0);
 vec3 lightDir = -normalize(vec3(0.0, 100.0, 0.0) - vec3(32.0));
 
-float ambientStrength = 0.4;
-float diffuseStrength = 0.45;
-float specularStrength = 0.05;
+float ambientStrength = 0.1;
+float diffuseStrength = 0.8;
+float specularStrength = 0.1;
 
 uniform vec3 viewPos;
 uniform float u_time;
 uniform sampler2DArray textureArray;
 
 void main(){
-    vec3 vColor = vec3(texture(textureArray, vTexCoord));
+    // Load the texture
+    // anti-gamma-correction of the texture. Without this it would be gamma corrected twice!
+    vec3 vColor = texture(textureArray, TexCoord).rgb;
     
-    // offset the normal a tiny bit, so that the color of faces opposing lightDir is not completely
-    // flat
-    vec3 normal = normalize(vNormal);
+    vec3 normal = normalize(Normal);
 
-    // Blinn-Phong lighting
+    /* Start of Blinn-Phong lighting */
     // Ambient
     vec3 ambient = lightColor*vColor;
 

shaders/shader-texture.gs

@@ -0,0 +1,80 @@
+#version 330 core
+
+layout (points) in;
+layout (triangle_strip, max_vertices = 4) out;
+
+in VS_OUT{
+    vec3 Extents;
+    vec3 Normal;
+    float BlockType;
+} gs_in[];
+
+out vec3 TexCoord;
+out vec3 Normal;
+out vec3 FragPos;
+
+uniform mat4 view;
+uniform mat4 projection;
+
+void main(){
+    Normal = gs_in[0].Normal;
+
+    TexCoord = vec3(0.0, 0.0, gs_in[0].BlockType);
+    gl_Position = gl_in[0].gl_Position;
+    FragPos = vec3(gl_Position);
+    gl_Position = projection * view * gl_Position;
+    EmitVertex();
+
+    if(gs_in[0].Extents.x == 0){
+	TexCoord = vec3(0.0, gs_in[0].Extents.z, gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(0.0, 0.0, gs_in[0].Extents.z, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(gs_in[0].Extents.y, 0.0,  gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(0.0, gs_in[0].Extents.y, 0.0, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(gs_in[0].Extents.y, gs_in[0].Extents.z,  gs_in[0].BlockType);
+    }
+    else if(gs_in[0].Extents.y == 0){
+	TexCoord = vec3(0.0, gs_in[0].Extents.z, gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(0.0, 0.0, gs_in[0].Extents.z, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(gs_in[0].Extents.x, 0.0, gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(gs_in[0].Extents.x, 0.0, 0.0, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(gs_in[0].Extents.x, gs_in[0].Extents.z,  gs_in[0].BlockType);
+    }
+    else{
+	TexCoord = vec3(gs_in[0].Extents.x, 0.0, gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(gs_in[0].Extents.x, 0.0, 0.0, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(0.0, gs_in[0].Extents.y, gs_in[0].BlockType);
+	gl_Position = gl_in[0].gl_Position + vec4(0.0, gs_in[0].Extents.y, 0.0, 0.0);
+	FragPos = vec3(gl_Position);
+	gl_Position = projection * view * gl_Position;
+	EmitVertex();
+
+	TexCoord = vec3(gs_in[0].Extents.x, gs_in[0].Extents.y,  gs_in[0].BlockType);
+    }
+
+    gl_Position = gl_in[0].gl_Position + vec4(gs_in[0].Extents, 0.0);
+    FragPos = vec3(gl_Position);
+    gl_Position = projection * view * gl_Position;
+    EmitVertex();
+
+    EndPrimitive();
+}

shaders/shader-texture.vs

@@ -1,22 +1,27 @@
 #version 330 core
 
 layout (location = 0) in vec3 aPos;
-layout (location = 1) in vec3 aNormal;
-layout (location = 2) in vec3 aTexCoord;
+layout (location = 1) in vec3 aExtents;
+layout (location = 2) in vec2 aInfo;
 
 uniform mat4 model;
-uniform mat4 view;
-uniform mat4 projection;
 
-out vec3 vNormal;
-out vec3 vTexCoord;
-out vec3 FragPos;
+out VS_OUT {
+    vec3 Extents;
+    vec3 Normal;
+    float BlockType;
+} vs_out;
 
 void main()
 {
-    vTexCoord = aTexCoord;
-    vNormal = mat3(transpose(inverse(model))) * aNormal;
+    //vNormal = mat3(transpose(inverse(model))) * aNormal;
+    vs_out.Extents = aExtents;
+    vs_out.BlockType = aInfo.y;
 
-    FragPos = vec3(model*vec4(aPos, 1.0));
-    gl_Position = projection * view * model * vec4(aPos, 1.0);
+    if(aExtents.x == 0) vs_out.Normal = vec3(1.0 - 2*aInfo.x, 0.0, 0.0);
+    else if(aExtents.y == 0) vs_out.Normal = vec3(0.0, 1.0 - 2*aInfo.x, 0.0);
+    else vs_out.Normal = vec3(0.0, 0.0, 1.0 - 2*aInfo.x);
+    vs_out.Normal = mat3(transpose(inverse(model))) * vs_out.Normal;
+
+    gl_Position = model * vec4(aPos, 1.0);
 }