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Fix C example in README

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Remove the usage of C++ STL types in the C-only interface example.

Fixes #3239.
This commit is contained in:
Nathaniel Cesario 2023-07-07 00:03:58 -06:00 committed by arcady-lunarg
parent 3ebb72cc74
commit eaa7057768
1 changed files with 24 additions and 10 deletions
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34
README.md
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@ -425,9 +425,18 @@ warning/error and other options for controlling compilation.
This interface is located `glslang_c_interface.h` and exposes functionality similar to the C++ interface. The following snippet is a complete example showing how to compile GLSL into SPIR-V 1.5 for Vulkan 1.2.
```cxx
std::vector<uint32_t> compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const char* shaderSource, const char* fileName)
{
```c
#include <glslang/Include/glslang_c_interface.h>
// Required for use of glslang_default_resource
#include <glslang/Public/resource_limits_c.h>
typedef struct SpirVBinary {
uint32_t *words; // SPIR-V words
int size; // number of words in SPIR-V binary
} SpirVBinary;
SpirVBinary compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const char* shaderSource, const char* fileName) {
const glslang_input_t input = {
.language = GLSLANG_SOURCE_GLSL,
.stage = stage,
@ -441,18 +450,22 @@ std::vector<uint32_t> compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const c
.force_default_version_and_profile = false,
.forward_compatible = false,
.messages = GLSLANG_MSG_DEFAULT_BIT,
.resource = reinterpret_cast<const glslang_resource_t*>(&glslang::DefaultTBuiltInResource),
.resource = glslang_default_resource(),
};
glslang_shader_t* shader = glslang_shader_create(&input);
SpirVBinary bin = {
.words = NULL,
.size = 0,
};
if (!glslang_shader_preprocess(shader, &input)) {
printf("GLSL preprocessing failed %s\n", fileName);
printf("%s\n", glslang_shader_get_info_log(shader));
printf("%s\n", glslang_shader_get_info_debug_log(shader));
printf("%s\n", input.code);
glslang_shader_delete(shader);
return std::vector<uint32_t>();
return bin;
}
if (!glslang_shader_parse(shader, &input)) {
@ -461,7 +474,7 @@ std::vector<uint32_t> compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const c
printf("%s\n", glslang_shader_get_info_debug_log(shader));
printf("%s\n", glslang_shader_get_preprocessed_code(shader));
glslang_shader_delete(shader);
return std::vector<uint32_t>();
return bin;
}
glslang_program_t* program = glslang_program_create();
@ -473,13 +486,14 @@ std::vector<uint32_t> compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const c
printf("%s\n", glslang_program_get_info_debug_log(program));
glslang_program_delete(program);
glslang_shader_delete(shader);
return std::vector<uint32_t>();
return bin;
}
glslang_program_SPIRV_generate(program, stage);
std::vector<uint32_t> outShaderModule(glslang_program_SPIRV_get_size(program));
glslang_program_SPIRV_get(program, outShaderModule.data());
bin.size = glslang_program_SPIRV_get_size(program);
bin.words = malloc(bin.size * sizeof(uint32_t));
glslang_program_SPIRV_get(program, bin.words);
const char* spirv_messages = glslang_program_SPIRV_get_messages(program);
if (spirv_messages)
@ -488,7 +502,7 @@ std::vector<uint32_t> compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const c
glslang_program_delete(program);
glslang_shader_delete(shader);
return outShaderModule;
return bin;
}
```