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comparison src/shader.nim @ 17:b40466fa446a

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add: vertex basics, some refactoring
author Sam <sam@basx.dev>
date Sun, 01 Jan 2023 01:00:50 +0700
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16:617c6dcddbe2 17:b40466fa446a
1 import std/tables
2
3 import ./vulkan_helpers
4 import ./vulkan
5 import ./glslang/glslang
6
7 type
8 ShaderProgram* = object
9 entryPoint*: string
10 programType*: VkShaderStageFlagBits
11 shader*: VkPipelineShaderStageCreateInfo
12
13 proc initShaderProgram*(device: VkDevice, programType: VkShaderStageFlagBits, shader: string, entryPoint: string="main"): ShaderProgram =
14 result.entryPoint = entryPoint
15 result.programType = programType
16
17 const VK_GLSL_MAP = {
18 VK_SHADER_STAGE_VERTEX_BIT: GLSLANG_STAGE_VERTEX,
19 VK_SHADER_STAGE_FRAGMENT_BIT: GLSLANG_STAGE_FRAGMENT,
20 }.toTable()
21 var code = compileGLSLToSPIRV(VK_GLSL_MAP[result.programType], shader, "<memory-shader>")
22 var createInfo = VkShaderModuleCreateInfo(
23 sType: VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,
24 codeSize: uint(code.len * sizeof(uint32)),
25 pCode: if code.len > 0: addr(code[0]) else: nil,
26 )
27 var shaderModule: VkShaderModule
28 checkVkResult vkCreateShaderModule(device, addr(createInfo), nil, addr(shaderModule))
29
30 result.shader = VkPipelineShaderStageCreateInfo(
31 sType: VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
32 stage: programType,
33 module: shaderModule,
34 pName: cstring(result.entryPoint), # entry point for shader
35 )