| #!amber |
| # Copyright 2020 Google LLC. |
| # Copyright 2020 The Khronos Group Inc. |
| # |
| # 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. |
| |
| # This test draws two quads with depth values 0.3 and 0.5. Based on the equation in |
| # Vulkan spec 26.12.3 the effective constant bias o is calculated as follows: |
| |
| # Both quads have a constant depth value, thus the maximum depth slope m is zero. |
| # The maximum exponent e is taken from the constant depth value. |
| # For depth value 0.3 e is -2, and for value 0.5 it's -1. |
| |
| # 32bit float format has a mantissa size of 23 making n = 23. |
| # The minimum resolvable difference r is calculated as r = 2^(e-n). |
| |
| # Thus the constant bias o values are: |
| # 4194304 * r = 4194304 * 2^(-2-23) = 4194304 * 2^-25 = 0.125 |
| # and |
| # 4194304 * r = 4194304 * 2^(-1-23) = 4194304 * 2^-24 = 0.25 |
| |
| # Adding this to the existing quad depth values should result as |
| # 0.3 + 0.125 = 0.425 and 0.5 + 0.25 = 0.75. |
| |
| # The depth buffer is dumped as a RGBA8 image making the expected results |
| # roughly 0.425 * 255 = 108 and 0.75 * 255 = 191. |
| |
| SHADER vertex vert_shader GLSL |
| #version 430 |
| |
| layout(location = 0) in vec4 position; |
| layout(location = 0) out vec4 frag_color; |
| |
| layout(set = 0, binding = 0) readonly buffer block1 { |
| vec4 in_color; |
| float depth; |
| }; |
| |
| void main() { |
| gl_Position = vec4(position.xy, depth, 1.0); |
| frag_color = in_color; |
| } |
| END |
| |
| SHADER fragment frag_shader GLSL |
| #version 430 |
| |
| layout(location = 0) in vec4 frag_color; |
| layout(location = 0) out vec4 final_color; |
| |
| void main() { |
| final_color = frag_color; |
| } |
| 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) sampler2D tex_sampler; |
| void main() { |
| float f = texture(tex_sampler, texcoords_in).r; |
| color_out = vec4(f, f, f, 1); |
| } |
| END |
| |
| BUFFER data_buf1 DATA_TYPE float DATA 1.0 0.0 0.0 1.0 0.3 END |
| BUFFER data_buf2 DATA_TYPE float DATA 0.0 1.0 0.0 1.0 0.5 END |
| |
| 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 |
| 1.0 0.0 |
| 0.0 1.0 |
| 1.0 1.0 |
| END |
| |
| BUFFER framebuffer FORMAT B8G8R8A8_UNORM |
| BUFFER ddump FORMAT B8G8R8A8_UNORM |
| BUFFER depthstencil FORMAT D32_SFLOAT |
| |
| SAMPLER sampler |
| |
| PIPELINE graphics pipeline1 |
| ATTACH vert_shader |
| ATTACH frag_shader |
| |
| FRAMEBUFFER_SIZE 256 256 |
| BIND BUFFER framebuffer AS color LOCATION 0 |
| BIND BUFFER depthstencil AS depth_stencil |
| BIND BUFFER data_buf1 AS storage DESCRIPTOR_SET 0 BINDING 0 |
| |
| DEPTH |
| TEST on |
| WRITE on |
| COMPARE_OP less |
| CLAMP off |
| BOUNDS min 0.0 max 1.0 |
| BIAS constant 4194304.0 clamp 0.0 slope 2.0 |
| END |
| END |
| |
| DERIVE_PIPELINE pipeline2 FROM pipeline1 |
| BIND BUFFER data_buf2 AS storage DESCRIPTOR_SET 0 BINDING 0 |
| END |
| |
| PIPELINE graphics depthdump |
| ATTACH vert_shader_tex |
| ATTACH frag_shader_tex |
| BIND BUFFER depthstencil AS combined_image_sampler SAMPLER sampler DESCRIPTOR_SET 0 BINDING 0 |
| VERTEX_DATA position LOCATION 0 |
| VERTEX_DATA texcoords LOCATION 1 |
| FRAMEBUFFER_SIZE 256 256 |
| BIND BUFFER ddump AS color LOCATION 0 |
| END |
| |
| CLEAR_DEPTH pipeline1 1.0 |
| CLEAR_COLOR pipeline1 255 255 255 255 |
| CLEAR pipeline1 |
| RUN pipeline1 DRAW_RECT POS 0 0 SIZE 200 200 |
| RUN pipeline2 DRAW_RECT POS 56 56 SIZE 200 200 |
| RUN depthdump DRAW_ARRAY AS TRIANGLE_STRIP START_IDX 0 COUNT 4 |
| |
| EXPECT ddump IDX 0 0 SIZE 1 1 EQ_RGBA 108 108 108 255 TOLERANCE 5% 5% 5% 0 |
| EXPECT ddump IDX 255 0 SIZE 1 1 EQ_RGBA 255 255 255 255 TOLERANCE 5% 5% 5% 0 |
| EXPECT ddump IDX 0 255 SIZE 1 1 EQ_RGBA 255 255 255 255 TOLERANCE 5% 5% 5% 0 |
| EXPECT ddump IDX 255 255 SIZE 1 1 EQ_RGBA 191 191 191 255 TOLERANCE 5% 5% 5% 0 |