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annotate src/zamikongine/shader.nim @ 494:0c18638c7217

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did: refactoring, move more from make to nimscript
author Sam <sam@basx.dev>
date Sun, 15 Jan 2023 23:23:54 +0700
parents 680c4b8ca28a
children 3f1111f3b9f8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
483
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diff changeset
1 import std/strformat
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2 import std/strutils
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3 import std/tables
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4 import std/compilesettings
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5
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6
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7 import ./vulkan_helpers
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8 import ./glsl_helpers
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9 import ./vulkan
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10 import ./vertex
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11 import ./descriptor
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12 import ./math/vector
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13
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14 type
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15 AllowedUniformType = SomeNumber|Vec
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16 UniformSlot *[T:AllowedUniformType] = object
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17 ShaderProgram*[VertexType, Uniforms] = object
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18 entryPoint*: string
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19 programType*: VkShaderStageFlagBits
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20 shader*: VkPipelineShaderStageCreateInfo
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21 uniforms*: Uniforms
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22
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23 func stage2string(stage: VkShaderStageFlagBits): string {.compileTime.} =
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24 case stage
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25 of VK_SHADER_STAGE_VERTEX_BIT: "vert"
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26 of VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT: "tesc"
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27 of VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT: "tese"
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28 of VK_SHADER_STAGE_GEOMETRY_BIT: "geom"
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29 of VK_SHADER_STAGE_FRAGMENT_BIT: "frag"
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30 of VK_SHADER_STAGE_ALL_GRAPHICS: ""
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31 of VK_SHADER_STAGE_COMPUTE_BIT: "comp"
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32 of VK_SHADER_STAGE_ALL: ""
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33
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34 proc compileGLSLToSPIRV(stage: VkShaderStageFlagBits, shaderSource: string, entrypoint: string): seq[uint32] {.compileTime.} =
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35 let stagename = stage2string(stage)
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36
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37 # TODO: compiles only on linux for now (because we don't have compile-time functionality in std/tempfile)
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38 let (tmpfile, exitCode) = gorgeEx(command=fmt"mktemp --tmpdir shader_XXXXXXX.{stagename}")
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39 if exitCode != 0:
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40 raise newException(Exception, tmpfile)
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41
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42 let (output, exitCode_glsl) = gorgeEx(command=fmt"{querySetting(projectPath)}/glslangValidator --entry-point {entrypoint} -V --stdin -S {stagename} -o {tmpfile}", input=shaderSource)
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43 if exitCode_glsl != 0:
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44 raise newException(Exception, output)
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45 let shaderbinary = staticRead tmpfile
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46
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47 let (output_rm, exitCode_rm) = gorgeEx(command=fmt"rm {tmpfile}")
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48 if exitCode_rm != 0:
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49 raise newException(Exception, output_rm)
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50
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51 var i = 0
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52 while i < shaderbinary.len:
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53 result.add(
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54 (uint32(shaderbinary[i + 0]) shl 0) or
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55 (uint32(shaderbinary[i + 1]) shl 8) or
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56 (uint32(shaderbinary[i + 2]) shl 16) or
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57 (uint32(shaderbinary[i + 3]) shl 24)
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58 )
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59 i += 4
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60
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61 proc initShaderProgram*[VertexType, Uniforms](device: VkDevice, programType: static VkShaderStageFlagBits, shader: static string, entryPoint: static string="main"): ShaderProgram[VertexType, Uniforms] =
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62 result.entryPoint = entryPoint
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63 result.programType = programType
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64
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65 const constcode = compileGLSLToSPIRV(programType, shader, entryPoint)
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66 var code = constcode
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67 var createInfo = VkShaderModuleCreateInfo(
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68 sType: VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
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69 codeSize: uint(code.len * sizeof(uint32)),
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70 pCode: if code.len > 0: addr(code[0]) else: nil,
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71 )
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72 var shaderModule: VkShaderModule
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73 checkVkResult vkCreateShaderModule(device, addr(createInfo), nil, addr(shaderModule))
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74
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75 result.shader = VkPipelineShaderStageCreateInfo(
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76 sType: VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
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77 stage: programType,
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78 module: shaderModule,
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79 pName: cstring(result.entryPoint), # entry point for shader
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80 )
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81
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82 func generateVertexShaderCode*[VertexType, Uniforms](
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83 shaderBody: static string = "",
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84 entryPoint: static string = "main",
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85 glslVersion: static string = "450"
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86 ): string {.compileTime.} =
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87 var lines: seq[string]
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88 lines.add "#version " & glslVersion
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89 lines.add "layout(row_major) uniform;"
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90 lines.add generateGLSLUniformDeclarations[Uniforms]()
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91 lines.add generateGLSLVertexDeclarations[VertexType]()
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92 lines.add "layout(location = 0) out vec3 fragColor;"
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93 lines.add "void " & entryPoint & "() {"
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94
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95 var hasPosition = 0
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96 var hasColor = 0
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97 for name, value in VertexType().fieldPairs:
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98 when typeof(value) is PositionAttribute:
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99 let glsltype = getGLSLType[getAttributeType(value)]()
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100 lines.add &" {glsltype} in_position = " & name & ";"
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101 if getAttributeType(value) is Vec2:
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102 lines.add " vec4 out_position = vec4(in_position, 0.0, 1.0);"
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103 elif getAttributeType(value) is Vec3:
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104 lines.add " vec4 out_position = vec4(in_position, 1.0);"
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105 elif getAttributeType(value) is Vec4:
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106 lines.add " vec4 out_position = in_position;"
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107 hasPosition += 1
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108 when typeof(value) is ColorAttribute:
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109 let glsltype = getGLSLType[getAttributeType(value)]()
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110 lines.add &" {glsltype} in_color = " & name & ";"
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111 lines.add &" {glsltype} out_color = in_color;";
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112 hasColor += 1
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113
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114 lines.add shaderBody
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115 lines.add " gl_Position = out_position;"
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116 lines.add " fragColor = out_color;"
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117 lines.add "}"
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118 if hasPosition != 1:
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119 raise newException(Exception, fmt"VertexType needs to have exactly one attribute of type PositionAttribute (has {hasPosition})")
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120 if hasColor != 1:
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121 raise newException(Exception, fmt"VertexType needs to have exactly one attribute of type ColorAttribute (has {hasColor})")
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122 return lines.join("\n")
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123
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124 func generateFragmentShaderCode*[VertexType](
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125 shaderBody: static string = "",
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126 entryPoint: static string = "main",
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127 glslVersion: static string = "450"
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128 ): string {.compileTime.} =
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129 var lines: seq[string]
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130 lines.add "#version " & glslVersion
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131 lines.add "layout(row_major) uniform;"
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132 lines.add "layout(location = 0) in vec3 fragColor;"
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133 lines.add "layout(location = 0) out vec4 outColor;"
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134 lines.add "void " & entryPoint & "() {"
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135 lines.add " vec3 in_color = fragColor;"
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136 lines.add " vec3 out_color = in_color;"
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137 lines.add shaderBody
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138 lines.add " outColor = vec4(out_color, 1.0);"
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139 lines.add "}"
14e5151f68d1 did: introduce scene graph, meshs and generic vertex buffers
Sam <sam@basx.dev>
parents:
diff changeset
140
14e5151f68d1 did: introduce scene graph, meshs and generic vertex buffers
Sam <sam@basx.dev>
parents:
diff changeset
141 return lines.join("\n")