draw_rect_blend.amber

#!amber
# Copyright 2021 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 GLSL
#version 430
layout(location = 0) out vec4 color_out;
void main()
{
  color_out = vec4(1.0, 0.0, 0.0, 0.5);
}
END

BUFFER framebuffer FORMAT B8G8R8A8_UNORM

PIPELINE graphics pipeline
  ATTACH vert_shader
  ATTACH frag_shader
  BIND BUFFER framebuffer AS color LOCATION 0

  BLEND
    SRC_COLOR_FACTOR src_alpha
    DST_COLOR_FACTOR one_minus_src_alpha
    COLOR_OP add
    SRC_ALPHA_FACTOR one
    DST_ALPHA_FACTOR one
    ALPHA_OP max
  END
END
 
CLEAR_COLOR pipeline 0 255 0 255
CLEAR pipeline
RUN pipeline DRAW_RECT POS 0 0 SIZE 250 250
EXPECT framebuffer IDX 0 0 SIZE 250 250 EQ_RGBA 128 128 0 255 TOLERANCE 5%