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2026-05-06 23:44:13 +02:00
parent a5f787d80f
commit fd7038b853
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+#!amber
+
+# Copyright 2020 Valve Corporation.
+# 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
+#
+#     http://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 vtx_shader SPIRV-ASM
+; SPIR-V
+; Version: 1.0
+; Generator: Khronos Glslang Reference Front End; 8
+; Bound: 30
+; Schema: 0
+;
+; Originally created from code like this one:
+;
+; #version 450
+; layout(location=0) in vec4 position;
+; void main() { gl_Position = position; }
+;
+                            OpCapability Shader
+                       %1 = OpExtInstImport "GLSL.std.450"
+                            OpMemoryModel Logical GLSL450
+                            OpEntryPoint Vertex %main "main" %_ %position
+                            OpSource GLSL 450
+                            OpName %main "main"
+                            OpName %gl_PerVertex "gl_PerVertex"
+                            OpMemberName %gl_PerVertex 0 "gl_Position"
+                            OpMemberName %gl_PerVertex 1 "gl_PointSize"
+                            OpMemberName %gl_PerVertex 2 "gl_ClipDistance"
+                            OpMemberName %gl_PerVertex 3 "gl_CullDistance"
+                            OpName %_ ""
+                            OpName %position "position"
+                            OpMemberDecorate %gl_PerVertex 0 BuiltIn Position
+                            OpMemberDecorate %gl_PerVertex 1 BuiltIn PointSize
+                            OpMemberDecorate %gl_PerVertex 2 BuiltIn ClipDistance
+                            OpMemberDecorate %gl_PerVertex 3 BuiltIn CullDistance
+                            OpDecorate %gl_PerVertex Block
+                            OpDecorate %position Location 0
+                    %void = OpTypeVoid
+                       %3 = OpTypeFunction %void
+                     %int = OpTypeInt 32 1
+                   %int_1 = OpConstant %int 1
+                   %float = OpTypeFloat 32
+                 %v4float = OpTypeVector %float 4
+                    %uint = OpTypeInt 32 0
+                  %uint_1 = OpConstant %uint 1
+       %_arr_float_uint_1 = OpTypeArray %float %uint_1
+            %gl_PerVertex = OpTypeStruct %v4float %float %_arr_float_uint_1 %_arr_float_uint_1
+%_ptr_Output_gl_PerVertex = OpTypePointer Output %gl_PerVertex
+                       %_ = OpVariable %_ptr_Output_gl_PerVertex Output
+                   %int_0 = OpConstant %int 0
+      %_ptr_Input_v4float = OpTypePointer Input %v4float
+                %position = OpVariable %_ptr_Input_v4float Input
+     %_ptr_Output_v4float = OpTypePointer Output %v4float
+                    %main = OpFunction %void None %3
+;
+; The rest of code below has been manually tuned.
+; The assignment to gl_Position is in the OpLoad, OpAccessChain and OpStore sequence.
+; It's wrapped inside a loop statement roughly equivalent to this:
+;
+; for (;;) {
+;     switch (1) {
+;         default:
+;            gl_Position = position;
+;            goto end;
+;     }
+; }
+; end:
+; return;
+;
+; Which means the code jumps directly from the end of the default block to the
+; loop exit, something that cannot be directly done in GLSL because it has no
+; goto nor any other equivalent instruction to directly exit the loop.
+;
+; The switch's merge block is unreachable and marked with OpUnreachable.
+; According to VK-GL-CTS issue #952, at least one driver goes into an infinite
+; loop when doing so.
+;
+              %main_start = OpLabel
+                            OpBranch %loop_start
+              %loop_start = OpLabel
+                            OpLoopMerge %loop_exit %loop_end None
+                            OpBranch %select_start
+            %select_start = OpLabel
+                            OpSelectionMerge %select_merge None
+                            OpSwitch %int_1 %switch_default
+          %switch_default = OpLabel
+                      %25 = OpLoad %v4float %position
+                      %27 = OpAccessChain %_ptr_Output_v4float %_ %int_0
+                            OpStore %27 %25
+                            OpBranch %loop_exit
+            %select_merge = OpLabel
+                            OpUnreachable
+                %loop_end = OpLabel
+                            OpBranch %loop_start
+               %loop_exit = OpLabel
+                            OpReturn
+                            OpFunctionEnd
+
+END
+
+SHADER fragment frag_shader GLSL
+#version 450
+
+layout(location = 0) out vec4 color_out;
+
+void main() {
+	// Red color.
+	color_out = vec4(1.0, 0.0, 0.0, 1.0);
+}
+END
+
+# Full-screen quad.
+BUFFER position_buf DATA_TYPE vec2<float> DATA
+-1 -1
+ 1 -1
+-1  1
+-1  1
+ 1 -1
+ 1  1
+END
+
+BUFFER framebuffer FORMAT B8G8R8A8_UNORM
+
+PIPELINE graphics pipeline
+  ATTACH vtx_shader
+  ATTACH frag_shader
+
+  VERTEX_DATA position_buf LOCATION 0
+
+  FRAMEBUFFER_SIZE 64 64
+  BIND BUFFER framebuffer AS color LOCATION 0
+END
+
+CLEAR pipeline
+
+RUN pipeline DRAW_ARRAY AS TRIANGLE_LIST START_IDX 0 COUNT 6
+EXPECT framebuffer IDX 0 0 SIZE 64 64 EQ_RGBA 255 0 0 255