Project6-Vulkan-Grass-Rendering/src/shaders/grass.tesc at 0f22c75cf3cb7bcfc79c25ab650675011c7511ff · CIS565-Fall-2017/Project6-Vulkan-Grass-Rendering · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
#version 450
#extension GL_ARB_separate_shader_objects : enable

layout(vertices = 1) out;

layout(set = 0, binding = 0) uniform CameraBufferObject {
    mat4 view;
    mat4 proj;
} camera;

// TODO: Declare tessellation control shader inputs and outputs
layout(location = 0) in vec4 control_v1[];
layout(location = 1) in vec4 control_v2[];
layout(location = 2) in vec4 control_up[];
layout(location = 3) in vec4 control_width[];

layout(location = 0) patch out vec4 evaluation_v1;
layout(location = 1) patch out vec4 evaluation_v2;
layout(location = 2) patch out vec4 evaluation_up;
layout(location = 3) patch out vec4 evaluation_Width;


void main() {

	// Don't move the origin location of the patch
	vec4 WorldPosV0 = gl_in[gl_InvocationID].gl_Position;
    gl_out[gl_InvocationID].gl_Position = WorldPosV0;


	// TODO: Write any shader outputs
	evaluation_v1 = control_v1[0];
    evaluation_v2 = control_v2[0];
    evaluation_up = control_up[0];
    evaluation_Width = control_width[0];
	float near = 0.1;
	float far = 25.0;

	float depth = -(camera.view * WorldPosV0).z / (far - near);
	depth = clamp(depth, 0.0, 1.0);

	float maxLevel = 5.0;
	float minLevel = 1.0;

	depth = depth*depth;

	float level = mix(maxLevel, minLevel, depth);
	evaluation_Width.w = depth;
	// TODO: Set level of tesselation
    gl_TessLevelInner[0] = 1.0; //horizontal
    gl_TessLevelInner[1] = level; //vertical

	gl_TessLevelOuter[0] = level; //vertical
    gl_TessLevelOuter[1] = 1.0; //horizontal
    gl_TessLevelOuter[2] = level; //vertical
    gl_TessLevelOuter[3] = 1.0; //horizontal


}