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1 import glslang_c_interface
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2 import glslang_c_shader_types
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3
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4 export
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5 glslang_stage_t,
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6 glslang_initialize_process,
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7 glslang_finalize_process
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8
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9 type
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10 ShaderVersion = enum
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11 ES_VERSION = 100
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12 DESKTOP_VERSION = 110
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13
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14 proc compileGLSLToSPIRV*(stage: glslang_stage_t, shaderSource: string, fileName: string): seq[uint32] =
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15 var input = glslang_input_t(
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16 stage: stage,
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17 language: GLSLANG_SOURCE_GLSL,
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18 client: GLSLANG_CLIENT_VULKAN,
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19 client_version: GLSLANG_TARGET_VULKAN_1_2,
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20 target_language: GLSLANG_TARGET_SPV,
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21 target_language_version: GLSLANG_TARGET_SPV_1_5,
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22 code: cstring(shaderSource),
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23 default_version: ord(DESKTOP_VERSION),
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24 default_profile: GLSLANG_CORE_PROFILE,
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25 force_default_version_and_profile: false.cint,
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26 forward_compatible: false.cint,
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27 messages: GLSLANG_MSG_DEBUG_INFO_BIT,
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28 resource: glslang_default_resource(),
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29 )
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30
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31 var shader = glslang_shader_create(addr(input))
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32
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33 if not bool(glslang_shader_preprocess(shader, addr(input))):
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34 echo "GLSL preprocessing failed " & fileName
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35 echo glslang_shader_get_info_log(shader)
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36 echo glslang_shader_get_info_debug_log(shader)
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37 echo input.code
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38 glslang_shader_delete(shader)
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39 return
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40
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41 if not bool(glslang_shader_parse(shader, addr(input))):
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42 echo "GLSL parsing failed " & fileName
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43 echo glslang_shader_get_info_log(shader)
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44 echo glslang_shader_get_info_debug_log(shader)
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45 echo glslang_shader_get_preprocessed_code(shader)
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46 glslang_shader_delete(shader)
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47 return
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48
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49 var program: ptr glslang_program_t = glslang_program_create()
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50 glslang_program_add_shader(program, shader)
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51
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52 if not bool(glslang_program_link(program, ord(GLSLANG_MSG_SPV_RULES_BIT) or ord(GLSLANG_MSG_VULKAN_RULES_BIT))):
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53 echo "GLSL linking failed " & fileName
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54 echo glslang_program_get_info_log(program)
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55 echo glslang_program_get_info_debug_log(program)
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56 glslang_program_delete(program)
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57 glslang_shader_delete(shader)
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58 return
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59
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60 glslang_program_SPIRV_generate(program, stage)
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61
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62 result = newSeq[uint32](glslang_program_SPIRV_get_size(program))
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63 glslang_program_SPIRV_get(program, addr(result[0]))
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64
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65 var spirv_messages: cstring = glslang_program_SPIRV_get_messages(program)
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66 if spirv_messages != nil:
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67 echo "(%s) %s\b", fileName, spirv_messages
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68
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69 glslang_program_delete(program)
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70 glslang_shader_delete(shader)
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71
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72 template checkGlslangResult*(call: untyped) =
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73 let value = call
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74 if value != 1:
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75 raise newException(Exception, "glgslang error: " & astToStr(call) & " returned " & $value)
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