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vulkan/amber/texture/subgroup_lod/texture_lod.amber

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+#!amber
+
+# Copyright 2019 Google LLC.
+# Copyright 2019 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.
+
+SHADER vertex vert_shader_mipclear PASSTHROUGH
+
+SHADER vertex vert_shader_lod GLSL
+#version 430
+
+layout(location = 0) in vec3 position_in;
+layout(location = 0) out vec4 color_out;
+layout(set = 0, binding = 0) uniform highp sampler2D tex;
+
+void main() {
+  gl_Position = vec4(position_in, 1.0);
+  // Pick a color from the center of a mipmap. Each corner point gets its own mip level.
+  color_out = vec4(textureLod(tex, vec2(0.5), float(gl_VertexIndex % 4)));
+}
+END
+
+SHADER fragment frag_shader GLSL
+#version 430
+
+layout(location = 0) in vec4 color_in;
+layout(location = 0) out vec4 color_out;
+
+void main() {
+  color_out = color_in;
+}
+END
+
+BUFFER texture FORMAT B8G8R8A8_UNORM MIP_LEVELS 4
+BUFFER framebuffer FORMAT B8G8R8A8_UNORM
+SAMPLER sampler MAX_LOD 4.0
+
+PIPELINE graphics mipclear_pipeline0
+  ATTACH vert_shader_mipclear
+  ATTACH frag_shader
+  BIND BUFFER texture AS color LOCATION 0 BASE_MIP_LEVEL 0
+  FRAMEBUFFER_SIZE 512 512
+END
+
+PIPELINE graphics mipclear_pipeline1
+  ATTACH vert_shader_mipclear
+  ATTACH frag_shader
+  BIND BUFFER texture AS color LOCATION 0 BASE_MIP_LEVEL 1
+  FRAMEBUFFER_SIZE 256 256
+END
+
+PIPELINE graphics mipclear_pipeline2
+  ATTACH vert_shader_mipclear
+  ATTACH frag_shader
+  BIND BUFFER texture AS color LOCATION 0 BASE_MIP_LEVEL 2
+  FRAMEBUFFER_SIZE 128 128
+END
+
+PIPELINE graphics mipclear_pipeline3
+  ATTACH vert_shader_mipclear
+  ATTACH frag_shader
+  BIND BUFFER texture AS color LOCATION 0 BASE_MIP_LEVEL 3
+  FRAMEBUFFER_SIZE 64 64
+END
+
+PIPELINE graphics lod_pipeline
+  ATTACH vert_shader_lod
+  ATTACH frag_shader
+  BIND BUFFER texture AS combined_image_sampler SAMPLER sampler DESCRIPTOR_SET 0 BINDING 0
+  BIND BUFFER framebuffer AS color LOCATION 0
+  FRAMEBUFFER_SIZE 512 512
+END
+
+# Clear all mip levels to different color.
+CLEAR_COLOR mipclear_pipeline0 255 0 0 255
+CLEAR mipclear_pipeline0
+CLEAR_COLOR mipclear_pipeline1 0 255 0 255
+CLEAR mipclear_pipeline1
+CLEAR_COLOR mipclear_pipeline2 0 0 255 255
+CLEAR mipclear_pipeline2
+CLEAR_COLOR mipclear_pipeline3 255 255 0 255
+CLEAR mipclear_pipeline3
+
+CLEAR_COLOR lod_pipeline 0 0 0 255
+CLEAR lod_pipeline
+RUN lod_pipeline DRAW_RECT POS 0 0 SIZE 512 512
+
+# Check corners of the frame buffer: each should have a color from a different mip level.
+EXPECT framebuffer IDX 0   511 SIZE 1 1 EQ_RGBA 255 0   0   255
+EXPECT framebuffer IDX 511 0   SIZE 1 1 EQ_RGBA 255 255 0   255
+EXPECT framebuffer IDX 511 511 SIZE 1 1 EQ_RGBA 0   0   255 255
+EXPECT framebuffer IDX 0   0   SIZE 1 1 EQ_RGBA 0   255 0   255