Opengl How to get each quad/patch and shade them different colours after tessellation?
0
The image above shows what I have so far.
I have managed to tessellate a quad with 4 vertices each patch (although there are some small issues in places, which I will fix soon), but next I wanted to shade each patch(quad) a differently colour, or if I could get a single patch and shade it that would be good as well, is this possibly?
Does anyone have any ideas on how I would do this?
Tess Control Shader
#version 410 core
layout(vertices = 4) out;
void main(void)
{
gl_TessLevelOuter[0] = 2.0;
gl_TessLevelOuter[1] = 4.0;
gl_TessLevelOuter[2] = 6.0;
gl_TessLevelOuter[3] = 8.0;
gl_TessLevelInner[0] = 8.0;
gl_TessLevelInner[1] = 8.0;
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}
Tess Evaluation Shader
#version 410 core
layout(quads, equal_spacing, ccw) in;
// quad interpolate
vec4 interpolate(in vec4 v0, in vec4 v1, in vec4 v2, in vec4 v3)
{
vec4 a = mix(v0, v1, gl_TessCoord.x);
vec4 b = mix(v3, v2, gl_TessCoord.x);
return mix(a, b, gl_TessCoord.y);
}
void main()
{
gl_Position = interpolate(
gl_in[0].gl_Position,
gl_in[1].gl_Position,
gl_in[2].gl_Position,
gl_in[3].gl_Position);
}
Geo Shader
#version 410 core
layout(triangles, invocations = 1) in;
layout(triangle_strip, max_vertices = 4) out;
void main(void)
{
gl_Position = gl_in[0].gl_Position;
EmitVertex();
gl_Position = gl_in[1].gl_Position;
EmitVertex();
gl_Position = gl_in[2].gl_Position;
EmitVertex();
EndPrimitive();
}
opengl glsl
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
add a comment |
0
The image above shows what I have so far.
I have managed to tessellate a quad with 4 vertices each patch (although there are some small issues in places, which I will fix soon), but next I wanted to shade each patch(quad) a differently colour, or if I could get a single patch and shade it that would be good as well, is this possibly?
Does anyone have any ideas on how I would do this?
Tess Control Shader
#version 410 core
layout(vertices = 4) out;
void main(void)
{
gl_TessLevelOuter[0] = 2.0;
gl_TessLevelOuter[1] = 4.0;
gl_TessLevelOuter[2] = 6.0;
gl_TessLevelOuter[3] = 8.0;
gl_TessLevelInner[0] = 8.0;
gl_TessLevelInner[1] = 8.0;
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}
Tess Evaluation Shader
#version 410 core
layout(quads, equal_spacing, ccw) in;
// quad interpolate
vec4 interpolate(in vec4 v0, in vec4 v1, in vec4 v2, in vec4 v3)
{
vec4 a = mix(v0, v1, gl_TessCoord.x);
vec4 b = mix(v3, v2, gl_TessCoord.x);
return mix(a, b, gl_TessCoord.y);
}
void main()
{
gl_Position = interpolate(
gl_in[0].gl_Position,
gl_in[1].gl_Position,
gl_in[2].gl_Position,
gl_in[3].gl_Position);
}
Geo Shader
#version 410 core
layout(triangles, invocations = 1) in;
layout(triangle_strip, max_vertices = 4) out;
void main(void)
{
gl_Position = gl_in[0].gl_Position;
EmitVertex();
gl_Position = gl_in[1].gl_Position;
EmitVertex();
gl_Position = gl_in[2].gl_Position;
EmitVertex();
EndPrimitive();
}
opengl glsl
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59
add a comment |
0
0
0
The image above shows what I have so far.
I have managed to tessellate a quad with 4 vertices each patch (although there are some small issues in places, which I will fix soon), but next I wanted to shade each patch(quad) a differently colour, or if I could get a single patch and shade it that would be good as well, is this possibly?
Does anyone have any ideas on how I would do this?
Tess Control Shader
#version 410 core
layout(vertices = 4) out;
void main(void)
{
gl_TessLevelOuter[0] = 2.0;
gl_TessLevelOuter[1] = 4.0;
gl_TessLevelOuter[2] = 6.0;
gl_TessLevelOuter[3] = 8.0;
gl_TessLevelInner[0] = 8.0;
gl_TessLevelInner[1] = 8.0;
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}
Tess Evaluation Shader
#version 410 core
layout(quads, equal_spacing, ccw) in;
// quad interpolate
vec4 interpolate(in vec4 v0, in vec4 v1, in vec4 v2, in vec4 v3)
{
vec4 a = mix(v0, v1, gl_TessCoord.x);
vec4 b = mix(v3, v2, gl_TessCoord.x);
return mix(a, b, gl_TessCoord.y);
}
void main()
{
gl_Position = interpolate(
gl_in[0].gl_Position,
gl_in[1].gl_Position,
gl_in[2].gl_Position,
gl_in[3].gl_Position);
}
Geo Shader
#version 410 core
layout(triangles, invocations = 1) in;
layout(triangle_strip, max_vertices = 4) out;
void main(void)
{
gl_Position = gl_in[0].gl_Position;
EmitVertex();
gl_Position = gl_in[1].gl_Position;
EmitVertex();
gl_Position = gl_in[2].gl_Position;
EmitVertex();
EndPrimitive();
}
opengl glsl
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
The image above shows what I have so far.
I have managed to tessellate a quad with 4 vertices each patch (although there are some small issues in places, which I will fix soon), but next I wanted to shade each patch(quad) a differently colour, or if I could get a single patch and shade it that would be good as well, is this possibly?
Does anyone have any ideas on how I would do this?
Tess Control Shader
#version 410 core
layout(vertices = 4) out;
void main(void)
{
gl_TessLevelOuter[0] = 2.0;
gl_TessLevelOuter[1] = 4.0;
gl_TessLevelOuter[2] = 6.0;
gl_TessLevelOuter[3] = 8.0;
gl_TessLevelInner[0] = 8.0;
gl_TessLevelInner[1] = 8.0;
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}
Tess Evaluation Shader
#version 410 core
layout(quads, equal_spacing, ccw) in;
// quad interpolate
vec4 interpolate(in vec4 v0, in vec4 v1, in vec4 v2, in vec4 v3)
{
vec4 a = mix(v0, v1, gl_TessCoord.x);
vec4 b = mix(v3, v2, gl_TessCoord.x);
return mix(a, b, gl_TessCoord.y);
}
void main()
{
gl_Position = interpolate(
gl_in[0].gl_Position,
gl_in[1].gl_Position,
gl_in[2].gl_Position,
gl_in[3].gl_Position);
}
Geo Shader
#version 410 core
layout(triangles, invocations = 1) in;
layout(triangle_strip, max_vertices = 4) out;
void main(void)
{
gl_Position = gl_in[0].gl_Position;
EmitVertex();
gl_Position = gl_in[1].gl_Position;
EmitVertex();
gl_Position = gl_in[2].gl_Position;
EmitVertex();
EndPrimitive();
}
opengl glsl
opengl glsl
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
edited Nov 24 '18 at 11:05
Rabbid76
34.9k113146
34.9k113146
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
asked Aug 2 '18 at 12:39
Charlie WheateCharlie Wheate
336
336
Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59
add a comment |
Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59
Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59
Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59
add a comment |
0
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Would this form of tessellation be used for something like Radosity?
– Charlie Wheate
Aug 2 '18 at 12:59