#!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_small FORMAT B8G8R8A8_UNORM
BUFFER texture FORMAT B8G8R8A8_UNORM
BUFFER framebuffer_linear FORMAT B8G8R8A8_UNORM
BUFFER framebuffer_nearest FORMAT B8G8R8A8_UNORM
SAMPLER sampler_linear MIN_FILTER linear MAG_FILTER nearest
SAMPLER sampler_nearest MIN_FILTER nearest MAG_FILTER nearest
BUFFER position DATA_TYPE vec2<float> DATA
-1.0 -1.0
 1.0 -1.0
 1.0  1.0
-1.0  1.0
END
BUFFER texcoords DATA_TYPE vec2<float> DATA
 0.0   0.0
16.0   0.0
16.0  16.0
 0.0  16.0
END

PIPELINE graphics pipeline_red
  ATTACH vert_shader
  ATTACH frag_shader_red
  FRAMEBUFFER_SIZE 2 2
  BIND BUFFER texture_small AS color LOCATION 0
END

PIPELINE graphics pipeline_tex_repeat
  ATTACH vert_shader_tex
  ATTACH frag_shader_tex
  BIND BUFFER texture_small AS sampled_image DESCRIPTOR_SET 0 BINDING 0
  BIND SAMPLER sampler_nearest DESCRIPTOR_SET 0 BINDING 1
  VERTEX_DATA position LOCATION 0
  VERTEX_DATA texcoords LOCATION 1
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER texture AS color LOCATION 0
END

PIPELINE graphics pipeline_linear
  ATTACH vert_shader_tex
  ATTACH frag_shader_tex
  BIND BUFFER texture AS sampled_image DESCRIPTOR_SET 0 BINDING 0
  BIND SAMPLER sampler_linear DESCRIPTOR_SET 0 BINDING 1
  VERTEX_DATA position LOCATION 0
  VERTEX_DATA texcoords LOCATION 1
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER framebuffer_linear AS color LOCATION 0
END

PIPELINE graphics pipeline_nearest
  ATTACH vert_shader_tex
  ATTACH frag_shader_tex
  BIND BUFFER texture AS sampled_image DESCRIPTOR_SET 0 BINDING 0
  BIND SAMPLER sampler_nearest DESCRIPTOR_SET 0 BINDING 1
  VERTEX_DATA position LOCATION 0
  VERTEX_DATA texcoords LOCATION 1
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER framebuffer_nearest AS color LOCATION 0
END

# Generate 2x2 pattern.
CLEAR_COLOR pipeline_red 0 0 255 255
CLEAR pipeline_red
RUN pipeline_red DRAW_RECT POS 0 0 SIZE 1 1
RUN pipeline_red DRAW_RECT POS 1 1 SIZE 1 1

# Make the pattern repeat into 256x256 texture
RUN pipeline_tex_repeat DRAW_ARRAY AS TRIANGLE_FAN START_IDX 0 COUNT 4

# Draw the repeated texture into a quad and again repeat 16 times
# to make it smaller. Do this with both nearest and linear filter mode.
CLEAR_COLOR pipeline_linear 0 255 0 255
CLEAR pipeline_linear
RUN pipeline_linear DRAW_ARRAY AS TRIANGLE_FAN START_IDX 0 COUNT 4
CLEAR_COLOR pipeline_nearest 0 255 0 255
CLEAR pipeline_nearest
RUN pipeline_nearest DRAW_ARRAY AS TRIANGLE_FAN START_IDX 0 COUNT 4

# Linear and nearest filtering produce different results so this should fail.
EXPECT framebuffer_nearest EQ_BUFFER framebuffer_linear