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package pipeline
import bk "../backend"
import gpu "../core"
import "core:log"
import vk "vendor:vulkan"
Graphics_Pipeline :: struct {
pipeline: vk.Pipeline,
layout: vk.PipelineLayout,
}
Pipeline_Config :: struct {
vert_module: vk.ShaderModule,
frag_module: vk.ShaderModule,
render_pass: vk.RenderPass,
topology: vk.PrimitiveTopology,
polygon_mode: vk.PolygonMode,
cull_mode: vk.CullModeFlags,
front_face: vk.FrontFace,
enable_blending: bool,
blend_mode: bk.Blend_Mode,
enable_depth_test: bool,
enable_depth_bias: bool,
stencil: bk.Stencil_State,
depth_only: bool, // no color attachment (shadow pass)
color_attachment_count: u32,
push_constant_size: u32,
push_constant_stages: vk.ShaderStageFlags,
descriptor_set_layouts: []vk.DescriptorSetLayout,
binding_descriptions: []vk.VertexInputBindingDescription,
attribute_descriptions: []vk.VertexInputAttributeDescription,
}
create_graphics_pipeline :: proc(
dev: ^gpu.Gpu_Device,
config: Pipeline_Config,
) -> (
gp: Graphics_Pipeline,
ok: bool,
) {
// Shader stages
stages := [2]vk.PipelineShaderStageCreateInfo {
{
sType = .PIPELINE_SHADER_STAGE_CREATE_INFO,
stage = {.VERTEX},
module = config.vert_module,
pName = "main",
},
{
sType = .PIPELINE_SHADER_STAGE_CREATE_INFO,
stage = {.FRAGMENT},
module = config.frag_module,
pName = "main",
},
}
// Vertex input
vertex_input := vk.PipelineVertexInputStateCreateInfo {
sType = .PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
vertexBindingDescriptionCount = u32(len(config.binding_descriptions)),
pVertexBindingDescriptions = raw_data(config.binding_descriptions),
vertexAttributeDescriptionCount = u32(len(config.attribute_descriptions)),
pVertexAttributeDescriptions = raw_data(config.attribute_descriptions),
}
// Input assembly
input_assembly := vk.PipelineInputAssemblyStateCreateInfo {
sType = .PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
topology = config.topology,
primitiveRestartEnable = false,
}
// Dynamic state: viewport + scissor (+ depth bias if enabled)
dynamic_states: [3]vk.DynamicState
dynamic_states[0] = .VIEWPORT
dynamic_states[1] = .SCISSOR
dynamic_state_count: u32 = 2
if config.enable_depth_bias {
dynamic_states[2] = .DEPTH_BIAS
dynamic_state_count = 3
}
dynamic_state := vk.PipelineDynamicStateCreateInfo {
sType = .PIPELINE_DYNAMIC_STATE_CREATE_INFO,
dynamicStateCount = dynamic_state_count,
pDynamicStates = &dynamic_states[0],
}
// Viewport state (counts only, actual values set dynamically)
viewport_state := vk.PipelineViewportStateCreateInfo {
sType = .PIPELINE_VIEWPORT_STATE_CREATE_INFO,
viewportCount = 1,
scissorCount = 1,
}
// Rasterization
rasterization := vk.PipelineRasterizationStateCreateInfo {
sType = .PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
depthClampEnable = false,
rasterizerDiscardEnable = false,
polygonMode = config.polygon_mode,
cullMode = config.cull_mode,
frontFace = config.front_face,
depthBiasEnable = b32(config.enable_depth_bias),
lineWidth = 1.0,
}
// Multisample
multisample := vk.PipelineMultisampleStateCreateInfo {
sType = .PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
rasterizationSamples = {._1},
sampleShadingEnable = false,
}
// Depth stencil
depth_stencil := vk.PipelineDepthStencilStateCreateInfo {
sType = .PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
depthTestEnable = b32(config.enable_depth_test),
depthWriteEnable = b32(config.enable_depth_test),
depthCompareOp = .LESS,
depthBoundsTestEnable = false,
stencilTestEnable = b32(config.stencil.enable),
front = to_vk_stencil_face(config.stencil.front, config.stencil),
back = to_vk_stencil_face(config.stencil.back, config.stencil),
}
// Color blend attachments
blend_attachments: [bk.MAX_COLOR_TARGETS]vk.PipelineColorBlendAttachmentState
attachment_count := config.color_attachment_count
if !config.depth_only && attachment_count == 0 {
attachment_count = 1
}
for i in 0..<attachment_count {
blend_attachments[i] = vk.PipelineColorBlendAttachmentState {
colorWriteMask = {.R, .G, .B, .A},
}
}
if config.enable_blending {
factors := bk.blend_factors(config.blend_mode)
for i in 0..<attachment_count {
blend_attachments[i].blendEnable = true
blend_attachments[i].colorBlendOp = .ADD
blend_attachments[i].srcColorBlendFactor = to_vk_blend_factor(factors.src_color)
blend_attachments[i].dstColorBlendFactor = to_vk_blend_factor(factors.dst_color)
blend_attachments[i].srcAlphaBlendFactor = to_vk_blend_factor(factors.src_alpha)
blend_attachments[i].dstAlphaBlendFactor = to_vk_blend_factor(factors.dst_alpha)
blend_attachments[i].alphaBlendOp = .ADD
}
}
color_blend := vk.PipelineColorBlendStateCreateInfo {
sType = .PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
logicOpEnable = false,
attachmentCount = config.depth_only ? 0 : attachment_count,
pAttachments = config.depth_only ? nil : &blend_attachments[0],
}
// Pipeline layout with optional push constants
push_range := vk.PushConstantRange {
stageFlags = config.push_constant_stages,
offset = 0,
size = config.push_constant_size,
}
layout_info := vk.PipelineLayoutCreateInfo {
sType = .PIPELINE_LAYOUT_CREATE_INFO,
setLayoutCount = u32(len(config.descriptor_set_layouts)),
pSetLayouts = raw_data(config.descriptor_set_layouts),
}
if config.push_constant_size > 0 {
layout_info.pushConstantRangeCount = 1
layout_info.pPushConstantRanges = &push_range
}
result := vk.CreatePipelineLayout(dev.device, &layout_info, nil, &gp.layout)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreatePipelineLayout failed: %v", result)
return {}, false
}
// Create the graphics pipeline
stage_count: u32 = config.depth_only ? 1 : 2
pipeline_info := vk.GraphicsPipelineCreateInfo {
sType = .GRAPHICS_PIPELINE_CREATE_INFO,
stageCount = stage_count,
pStages = &stages[0],
pVertexInputState = &vertex_input,
pInputAssemblyState = &input_assembly,
pViewportState = &viewport_state,
pRasterizationState = &rasterization,
pMultisampleState = &multisample,
pDepthStencilState = &depth_stencil,
pColorBlendState = &color_blend,
pDynamicState = &dynamic_state,
layout = gp.layout,
renderPass = config.render_pass,
subpass = 0,
}
result = vk.CreateGraphicsPipelines(dev.device, 0, 1, &pipeline_info, nil, &gp.pipeline)
if result != .SUCCESS {
log.errorf("gpu/pipeline: vkCreateGraphicsPipelines failed: %v", result)
vk.DestroyPipelineLayout(dev.device, gp.layout, nil)
return {}, false
}
return gp, true
}
destroy_graphics_pipeline :: proc(dev: ^gpu.Gpu_Device, p: ^Graphics_Pipeline) {
if p.pipeline != 0 {
vk.DestroyPipeline(dev.device, p.pipeline, nil)
p.pipeline = 0
}
if p.layout != 0 {
vk.DestroyPipelineLayout(dev.device, p.layout, nil)
p.layout = 0
}
}
@(private)
to_vk_blend_factor :: proc(factor: bk.Blend_Factor) -> vk.BlendFactor {
switch factor {
case .Zero:
return .ZERO
case .One:
return .ONE
case .Src_Alpha:
return .SRC_ALPHA
case .One_Minus_Src_Alpha:
return .ONE_MINUS_SRC_ALPHA
}
return .ONE
}
@(private)
to_vk_compare_op :: proc(op: bk.Compare_Op) -> vk.CompareOp {
switch op {
case .Never:
return .NEVER
case .Less:
return .LESS
case .Less_Or_Equal:
return .LESS_OR_EQUAL
case .Equal:
return .EQUAL
case .Greater_Or_Equal:
return .GREATER_OR_EQUAL
case .Greater:
return .GREATER
case .Not_Equal:
return .NOT_EQUAL
case .Always:
return .ALWAYS
}
return .ALWAYS
}
@(private)
to_vk_stencil_op :: proc(op: bk.Stencil_Op) -> vk.StencilOp {
switch op {
case .Keep:
return .KEEP
case .Zero:
return .ZERO
case .Replace:
return .REPLACE
case .Increment_Clamp:
return .INCREMENT_AND_CLAMP
case .Decrement_Clamp:
return .DECREMENT_AND_CLAMP
case .Invert:
return .INVERT
}
return .KEEP
}
@(private)
to_vk_stencil_face :: proc(face: bk.Stencil_Face_State, state: bk.Stencil_State) -> vk.StencilOpState {
return {
failOp = to_vk_stencil_op(face.fail_op),
passOp = to_vk_stencil_op(face.pass_op),
depthFailOp = to_vk_stencil_op(face.depth_fail_op),
compareOp = to_vk_compare_op(face.compare_op),
compareMask = u32(state.read_mask),
writeMask = u32(state.write_mask),
reference = u32(state.reference),
}
}