#!amber
# 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.

SHADER vertex vert_shader PASSTHROUGH

SHADER fragment frag_shader_red GLSL
#version 430
layout(location = 0) out vec4 color_out;
void main() {
  color_out = vec4(1.0, 0.0, 0.0, 1.0);
}
END

SHADER vertex vert_shader_tex GLSL
#version 430
layout(location = 0) in vec4 position;
layout(location = 1) in vec2 texcoords_in;
layout(location = 0) out vec2 texcoords_out;
void main() {
  gl_Position = position;
  texcoords_out = texcoords_in;
}
END

SHADER fragment frag_shader_tex GLSL
#version 430
layout(location = 0) in vec2 texcoords_in;
layout(location = 0) out vec4 color_out;
uniform layout(set=0, binding=0) texture2D tex;
uniform layout(set=0, binding=1) sampler tex_sampler;
void main() {
  color_out = texture(sampler2D(tex, tex_sampler), texcoords_in);
}
END

BUFFER texture FORMAT R8G8B8A8_UNORM
BUFFER framebuffer FORMAT B8G8R8A8_UNORM
SAMPLER sampler MAG_FILTER linear
BUFFER position DATA_TYPE vec2<float> DATA
-0.75 -0.75
 0.75 -0.75
 0.75  0.75
-0.75  0.75
END
BUFFER texcoords DATA_TYPE vec2<float> DATA
0.0 0.0
2.0 0.0
2.0 2.0
0.0 2.0
END

PIPELINE graphics pipeline1
  ATTACH vert_shader
  ATTACH frag_shader_red
  FRAMEBUFFER_SIZE 2 2
  BIND BUFFER texture AS color LOCATION 0
END

PIPELINE graphics pipeline2
  ATTACH vert_shader_tex
  ATTACH frag_shader_tex
  BIND BUFFER texture AS sampled_image DESCRIPTOR_SET 0 BINDING 0
  BIND SAMPLER sampler DESCRIPTOR_SET 0 BINDING 1
  VERTEX_DATA position LOCATION 0
  VERTEX_DATA texcoords LOCATION 1
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER framebuffer AS color LOCATION 0
END

# Generate a 2x2 texture with a one pixel sized chessboard pattern.
CLEAR_COLOR pipeline1 0 0 255 255
CLEAR pipeline1
RUN pipeline1 DRAW_RECT POS 0 0 SIZE 1 1
RUN pipeline1 DRAW_RECT POS 1 1 SIZE 1 1

# Draw a textured quad with linear magnification.
CLEAR_COLOR pipeline2 0 255 0 255
CLEAR pipeline2
RUN pipeline2 DRAW_ARRAY AS TRIANGLE_FAN START_IDX 0 COUNT 4

EXPECT framebuffer IDX 1 1 SIZE 1 1 EQ_RGBA 0 255 0 255
# Sample a pixel between two upsampled texels. The result should be roughly
# a mean value of the original colors.
EXPECT framebuffer IDX 80 80 SIZE 1 1 EQ_RGBA 128 0 128 255 TOLERANCE 3 0 3 0