#!amber
#
# Copyright 2020 The Khronos Group Inc.
# Copyright 2020 Valve Corporation.
#
# 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.

DEVICE_FEATURE geometryShader
DEVICE_FEATURE tessellationShader

SHADER vertex vert GLSL
#version 450
layout (location=0) in vec4 in_pos;
void main(void)
{
    gl_Position = in_pos;
}
END

SHADER tessellation_control tesc GLSL
#version 450
layout (vertices = 3) out;
void main(void)
{
    gl_TessLevelInner[0] = 1.0;
    gl_TessLevelInner[1] = 1.0;
    gl_TessLevelOuter[0] = 1.0;
    gl_TessLevelOuter[1] = 1.0;
    gl_TessLevelOuter[2] = 1.0;
    gl_TessLevelOuter[3] = 1.0;

    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}
END

SHADER tessellation_evaluation tese GLSL
#version 450
layout (triangles, fractional_odd_spacing, cw) in;
void main(void)
{
    gl_Position = (gl_TessCoord.x * gl_in[0].gl_Position) +
                  (gl_TessCoord.y * gl_in[1].gl_Position) +
                  (gl_TessCoord.z * gl_in[2].gl_Position);
}
END

SHADER fragment frag GLSL
#version 450
layout (location=0) out vec4 out_color;
void main(void)
{
    vec4 primitive_color;
    switch (gl_PrimitiveID) {
        case 0:
        case 1:
            primitive_color = vec4(0, 0, 1, 1);
            break;
        case 2:
        case 3:
            primitive_color = vec4(1, 0, 1, 1);
            break;
        default:
            primitive_color = vec4(0, 0, 0, 1);
            break;
    }
    out_color = primitive_color;
}
END

BUFFER position DATA_TYPE vec4<float> DATA
-1 -1 0 1
 1 -1 0 1
-1  0 0 1

-1  0 0 1
 1 -1 0 1
 1  0 0 1

-1  0 0 1
 1  0 0 1
-1  1 0 1

-1  1 0 1
 1  0 0 1
 1  1 0 1

END

BUFFER framebuffer FORMAT B8G8R8A8_UNORM

PIPELINE graphics graphics_pipeline
  ATTACH vert
  ATTACH tesc
  ATTACH tese
  ATTACH frag
  VERTEX_DATA position LOCATION 0
  BIND BUFFER framebuffer AS color LOCATION 0
END

CLEAR_COLOR graphics_pipeline 255 255 255 255
CLEAR graphics_pipeline
RUN graphics_pipeline DRAW_ARRAY AS PATCH_LIST START_IDX 0 COUNT 12
EXPECT framebuffer IDX 0 0   SIZE 250 125 EQ_RGBA 0   0 255 255
EXPECT framebuffer IDX 0 125 SIZE 250 125 EQ_RGBA 255 0 255 255