tests/cases/draw_triangle_list_using_geom_shader.vkscript

# Copyright 2019 The Amber Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

[require]
geometryShader

[vertex shader]
#version 430

layout(location = 0) in vec4 position;
layout(location = 1) in vec4 vert_color;
layout(location = 0) out vec4 geom_color;

void main() {
  gl_Position = position;
  geom_color = vert_color;
}

[geometry shader]
#version 430

layout (points) in;
layout (triangle_strip, max_vertices = 6) out;

layout(location = 0) in vec4 geom_color[];

layout(location = 0) out vec4 frag_color;

void
main()
{
        gl_Position = gl_in[0].gl_Position;
        frag_color = geom_color[0];
        EmitVertex();

        gl_Position = vec4(gl_in[0].gl_Position.x + 1.0,
                           gl_in[0].gl_Position.y + 1.0,
                           0.0, 1.0);
        frag_color = geom_color[0];
        EmitVertex();
        EndPrimitive();

        gl_Position = vec4(gl_in[0].gl_Position.x,
                           gl_in[0].gl_Position.y + 1.0,
                           0.0, 1.0);
        frag_color = geom_color[0];
        EmitVertex();

        gl_Position = gl_in[0].gl_Position;
        frag_color = geom_color[0];
        EmitVertex();

        gl_Position = vec4(gl_in[0].gl_Position.x + 1.0,
                           gl_in[0].gl_Position.y + 1.0,
                           0.0, 1.0);
        frag_color = geom_color[0];
        EmitVertex();

        gl_Position = vec4(gl_in[0].gl_Position.x + 1.0,
                           gl_in[0].gl_Position.y,
                           0.0, 1.0);
        frag_color = geom_color[0];
        EmitVertex();
}

[fragment shader]
#version 430

layout(location = 0) in vec4 frag_color;
layout(location = 0) out vec4 final_color;

void main() {
  final_color = frag_color;
}

[vertex data]
#        position     vert_color
     0/R8G8_SNORM 1/R8G8B8_UNORM

# Red for left-top quarter frame
#         R8   G8     R8  G8  B8
        -128 -128    255   0   0

# Green for right-top quarter frame
#         R8   G8     R8  G8  B8
           0 -128      0 255   0

# Blue for left-bottom quarter frame
#         R8   G8     R8  G8  B8
        -128    0      0   0 255

#  Mixed color for quarter frame
#         R8   G8     R8  G8  B8
           0    0    128 128 128

[test]
clear

draw arrays POINT_LIST 0 4
relative probe rect rgb (0.0, 0.0, 0.5, 0.5) (1.0, 0, 0)
relative probe rect rgb (0.5, 0.0, 0.5, 0.5) (0, 1.0, 0)
relative probe rect rgb (0.0, 0.5, 0.5, 0.5) (0, 0, 1.0)
relative probe rect rgb (0.5, 0.5, 0.5, 0.5) (0.5, 0.5, 0.5)