tessalation started

HydraEngine/source/ShaderFiles/landscape_shader.frag

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+//*PIXEL*
+#version 460 core
+
+#extension GL_ARB_bindless_texture : require
+
+
+uint INVALID_HYDRA_ID = 4294967295;
+
+struct MaterialStore
+{
+	vec4 diffuse_colour;	
+	vec4 matalic_rough;	 
+    uint diffuse_texture_id;
+    uint metallic_rough_texture_id;
+    uint normal_texture_id;
+	uint padding[1];
+};
+
+layout(binding = 2, std430) readonly buffer material_buffer
+{
+	MaterialStore materials[1000];
+};
+
+layout( std430, binding = 3) readonly buffer texture_buffer {
+    uvec2 textures[1000];
+};
+
+layout (location=0) in TE_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}vs_out;
+
+layout (location=0) out vec4 diffuse_out;
+layout (location=1) out vec4 metalic_rough_out;
+layout (location=2) out vec4 normal_out;
+layout (location=3) out vec4 position_out;
+
+void main()
+{
+	MaterialStore mat = materials[vs_out.vsMaterialID];
+	vec4 diffuse_val = mat.diffuse_colour;
+	vec4 mat_rough_val =mat.matalic_rough;
+	vec3 normal_val = vs_out.vsNormal;
+
+	if(mat.diffuse_texture_id != INVALID_HYDRA_ID)
+	{
+		uvec2 diffuse_handle = textures[mat.diffuse_texture_id];
+		diffuse_val = diffuse_val * texture(sampler2D(diffuse_handle), vs_out.vsUV.xy);	
+	}
+	if(mat.metallic_rough_texture_id != INVALID_HYDRA_ID)
+	{
+		uvec2 metal_rough_handle = textures[mat.metallic_rough_texture_id];
+		mat_rough_val = texture(sampler2D(metal_rough_handle), vs_out.vsUV.xy);	
+	}
+	if(mat.normal_texture_id != INVALID_HYDRA_ID)
+	{
+		uvec2 normal_handle = textures[mat.normal_texture_id];
+		normal_val = texture(sampler2D(normal_handle), vs_out.vsUV.xy).xyz;	
+		normal_val = (normal_val * 2.0) - 1.0;   
+		normal_val = normalize(vs_out.vsTBN * normal_val); 	
+	}
+	
+	if(diffuse_val[3] <= 0.4)
+	{
+		discard;
+	}
+	
+	diffuse_out = diffuse_val;
+	metalic_rough_out = mat_rough_val;	
+	normal_out = vec4(normal_val,1);
+	position_out = vs_out.vsWorldPos;
+}

HydraEngine/source/ShaderFiles/landscape_shader.tesc

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+// tessellation control shader
+#version 450 core
+
+// specify number of control points per patch output
+// this value controls the size of the input and output arrays
+layout (vertices=4) out;
+
+layout (location=0) in VS_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}tc_in[];
+
+layout (location=0) out TC_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}tc_out[];
+
+
+void main()
+{
+    // ----------------------------------------------------------------------
+    // pass attributes through
+    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
+    tc_out[gl_InvocationID].vsUV = tc_in[gl_InvocationID].vsUV;
+    tc_out[gl_InvocationID].vsWorldPos = tc_in[gl_InvocationID].vsWorldPos;
+    tc_out[gl_InvocationID].vsNormal = tc_in[gl_InvocationID].vsNormal;
+    tc_out[gl_InvocationID].vsBiTangent = tc_in[gl_InvocationID].vsBiTangent;
+    tc_out[gl_InvocationID].vsTangent = tc_in[gl_InvocationID].vsTangent;
+    tc_out[gl_InvocationID].vsTBN = tc_in[gl_InvocationID].vsTBN;
+    tc_out[gl_InvocationID].vsChunkID = tc_in[gl_InvocationID].vsChunkID;
+    tc_out[gl_InvocationID].vsMaterialID = tc_in[gl_InvocationID].vsMaterialID;
+	
+    // ----------------------------------------------------------------------
+    // invocation zero controls tessellation levels for the entire patch
+    if (gl_InvocationID == 0)
+    {
+        
+        int divs = 63;
+        gl_TessLevelOuter[0] = divs;
+        gl_TessLevelOuter[1] = divs;
+        gl_TessLevelOuter[2] = divs;
+        gl_TessLevelOuter[3] = divs;
+        gl_TessLevelInner[0] = divs;
+        gl_TessLevelInner[1] = divs;
+    }
+}

HydraEngine/source/ShaderFiles/landscape_shader.tese

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+// tessellation evaluation shader
+#version 450 core
+
+layout (quads, equal_spacing, ccw) in;
+
+layout(std430, binding = 1) readonly buffer positions_buffer 
+{
+	mat4 model_matrix[];
+};
+
+layout(binding = 0) uniform uniform_per_frame
+{	
+	mat4 view;
+	mat4 proj;	
+	vec3 viewer_pos;	
+	uint light_count;
+} ubo_per_frame;
+
+// received from Tessellation Control Shader - all texture coordinates for the patch vertices
+// varying input from vertex shader
+
+layout (location=0) in TC_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}te_in[];
+
+layout (location=0) out TE_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}te_out;
+
+void main()
+{
+    // get patch coordinate
+    te_out.vsUV.x = gl_TessCoord.x;
+    te_out.vsUV.y = gl_TessCoord.y;
+
+    // ----------------------------------------------------------------------
+    // retrieve control point texture coordinates
+    vec2 t00 = te_in[0].vsUV;
+    vec2 t01 = te_in[1].vsUV;
+    vec2 t10 = te_in[2].vsUV;
+    vec2 t11 = te_in[3].vsUV;
+
+//    t00|t10
+//    -------
+//    t10|t11
+
+    // ----------------------------------------------------------------------
+    // retrieve control point position coordinates
+    vec4 p00 = gl_in[0].gl_Position;
+    vec4 p01 = gl_in[1].gl_Position;
+    vec4 p10 = gl_in[2].gl_Position;
+    vec4 p11 = gl_in[3].gl_Position;
+
+    // compute patch surface normal
+    vec4 uVec = p01 - p00;
+    vec4 vVec = p10 - p00;
+    vec4 normal = normalize( vec4(cross(uVec.xyz, vVec.xyz), 1));
+
+    te_out.vsNormal = normal.xyz;
+    // bilinearly interpolate position coordinate across patch
+    vec4 p0 = (p01 - p00) *  te_out.vsUV.x + p00;
+    vec4 p1 = (p11 - p10) *  te_out.vsUV.x + p10;
+    vec4 p = (p1 - p0) *  te_out.vsUV.y + p0;
+    
+    // displace point along normal
+   // p += -normal * height;
+   //height = 0;
+    
+    //p[3] = 1;
+    // ----------------------------------------------------------------------
+    // output patch point position in clip space
+
+    mat4 model = model_matrix[te_in[0].vsChunkID];
+	mat4 view = ubo_per_frame.view;
+	mat4 proj = ubo_per_frame.proj;
+    gl_Position = proj * view * model * p;
+}

HydraEngine/source/ShaderFiles/landscape_shader.vert

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+#version 460 core
+#extension GL_ARB_bindless_texture : require
+
+layout(binding = 0) uniform uniform_per_frame
+{	
+	mat4 view;
+	mat4 proj;	
+	vec3 viewer_pos;	
+	uint light_count;
+} ubo_per_frame;
+
+layout(std430, binding = 1) readonly buffer positions_buffer 
+{
+	mat4 model_matrix[];
+};
+
+layout (location = 0) in vec3 inPos; 		//12 bytes : 0
+layout (location = 1) in vec2 inUV;  		//8 Bytes  : 12
+layout (location = 2) in uvec3 inChunkID; 	//12 Bytes : 20
+layout (location = 3) in vec3 inNormal;  	//8 Bytes  : 12 
+layout (location = 4) in vec3 inBiTangent;
+layout (location = 5) in vec3 inTangent;
+
+layout(location=0) out VS_OUT
+{
+	vec2 vsUV;
+	vec4 vsWorldPos;
+	vec3 vsNormal;
+	vec3 vsBiTangent;
+	vec3 vsTangent;
+	mat3 vsTBN;
+	flat uint vsChunkID;
+	flat uint vsMaterialID;
+}vs_out;
+
+out vec2 vertUV_out;
+out ivec4 vertEdges_out;
+out int vertChild_out;
+
+void main() 
+{
+	uint chunkid = inChunkID[0];
+	mat4 model = model_matrix[chunkid];
+	mat4 view = ubo_per_frame.view;
+	mat4 proj = ubo_per_frame.proj;
+	//model = mat4(1);
+ 	gl_Position = proj * view * model * vec4(inPos, 1.0);
+	vs_out.vsWorldPos =  model * vec4(inPos,1);
+
+	vs_out.vsNormal = normalize(vec3(model * vec4(normalize(inNormal),0)));
+	vs_out.vsTangent =   normalize(vec3(model *vec4(inTangent,0))) ;
+	vs_out.vsBiTangent =  normalize(vec3(model *vec4(inBiTangent,0)));
+
+	vs_out.vsTBN = mat3(vs_out.vsTangent, vs_out.vsBiTangent, vs_out.vsNormal);
+
+	vs_out.vsUV = inUV;	
+	vs_out.vsChunkID = chunkid;
+	vs_out.vsMaterialID = inChunkID[1];
+}