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#include "pbr.h"
#include "camera.h"
#include "core.h"
#include "file.h"
#include "log.h"
#include "maths.h"
#include "mem.h"
#include "ral_common.h"
#include "ral_impl.h"
#include "ral_types.h"
#include "render.h"
#include "render_types.h"
#include "shader_layouts.h"
void PBR_Init(PBR_Storage* storage) {
INFO("PBR shaders init");
storage->pbr_pass = PBR_RPassCreate();
PBR_PipelinesCreate(storage, storage->pbr_pass);
}
GPU_Renderpass* PBR_RPassCreate() {
GPU_RenderpassDesc desc = { .default_framebuffer = true };
return GPU_Renderpass_Create(desc);
}
void PBR_PipelinesCreate(PBR_Storage* storage, GPU_Renderpass* rpass) {
// Static
{
const char* vert_path = "assets/shaders/static_geometry.vert";
const char* frag_path = "assets/shaders/pbr_textured.frag";
char* vert_shader = string_from_file(vert_path);
char* frag_shader = string_from_file(frag_path);
ShaderDataLayout camera_data = Binding_Camera_GetLayout(NULL);
ShaderDataLayout model_data = Binding_Model_GetLayout(NULL);
ShaderDataLayout material_data = PBRMaterial_GetLayout(NULL);
ShaderDataLayout lights_data = Binding_Lights_GetLayout(NULL);
GraphicsPipelineDesc desc = {
.debug_name = "PBR (Static) Pipeline",
.vertex_desc = static_3d_vertex_description(),
.data_layouts = { camera_data, model_data, material_data, lights_data },
.data_layouts_count = 4,
.vs = { .debug_name = "PBR (textured) Vertex Shader",
.filepath = str8(vert_path),
.code = vert_shader },
.fs = { .debug_name = "PBR (textured) Fragment Shader",
.filepath = str8(frag_path),
.code = frag_shader },
.depth_test = true,
.wireframe = true,
};
storage->pbr_static_pipeline = GPU_GraphicsPipeline_Create(desc, rpass);
}
// Skinned
{
const char* vert_path = "assets/shaders/skinned_geometry.vert";
const char* frag_path = "assets/shaders/pbr_textured.frag";
char* vert_shader = string_from_file(vert_path);
char* frag_shader = string_from_file(frag_path);
ShaderDataLayout camera_data = Binding_Camera_GetLayout(NULL);
ShaderDataLayout model_data = Binding_Model_GetLayout(NULL);
ShaderDataLayout material_data = PBRMaterial_GetLayout(NULL);
ShaderDataLayout lights_data = Binding_Lights_GetLayout(NULL);
VertexDescription vertex_desc = { .debug_label = "Skinned vertices",
.use_full_vertex_size = true };
VertexDesc_AddAttr(&vertex_desc, "inPos", ATTR_F32x3);
VertexDesc_AddAttr(&vertex_desc, "inNormal", ATTR_F32x3);
VertexDesc_AddAttr(&vertex_desc, "inTexCoords", ATTR_F32x2);
VertexDesc_AddAttr(&vertex_desc, "inBoneIndices", ATTR_I32x4);
VertexDesc_AddAttr(&vertex_desc, "inWeights", ATTR_F32x4);
GraphicsPipelineDesc desc = {
.debug_name = "PBR (Skinned) Pipeline",
.vertex_desc = vertex_desc,
.data_layouts = { camera_data, model_data, material_data, lights_data },
.data_layouts_count = 4,
.vs = { .debug_name = "PBR (textured) Vertex Shader",
.filepath = str8(vert_path),
.code = vert_shader },
.fs = { .debug_name = "PBR (textured) Fragment Shader",
.filepath = str8(frag_path),
.code = frag_shader },
.depth_test = true,
.wireframe = true,
};
storage->pbr_skinned_pipeline = GPU_GraphicsPipeline_Create(desc, rpass);
}
}
void PBR_Execute(PBR_Storage* storage, Camera camera, TextureHandle shadowmap_tex,
RenderEnt* entities, size_t entity_count) {
// 1. set up our pipeline
// 2. upload constant data (camera, lights)
// 3. draw each entity
// - upload material data -> in the future we will sort & batch by material
// - upload model transform
// - emit draw call
GPU_CmdEncoder* enc = GPU_GetDefaultEncoder();
GPU_CmdEncoder_BeginRender(enc, storage->pbr_pass);
GPU_EncodeBindPipeline(enc, storage->pbr_static_pipeline);
// Feed shader data
Mat4 view, proj;
u32x2 dimensions = GPU_Swapchain_GetDimensions();
Camera_ViewProj(&camera, (f32)dimensions.x, (f32)dimensions.y, &view, &proj);
Binding_Camera camera_data = { .view = view,
.projection = proj,
.viewPos = vec4(camera.position.x, camera.position.y,
camera.position.z, 1.0) };
GPU_EncodeBindShaderData(enc, 0, Binding_Camera_GetLayout(&camera_data));
Vec3 light_color = vec3(300.0, 300.0, 300.0);
Binding_Lights
lights_data = { .pointLights = {
// FIXME: add lights to our RenderScene structure. for now these are
// hardcoded
(pbr_point_light){ .pos = vec3(0.0, 6.0, 6.0), .color = light_color },
(pbr_point_light){ .pos = vec3(-10, 10, 10), .color = light_color },
(pbr_point_light){ .pos = vec3(10, -10, 10), .color = light_color },
(pbr_point_light){ .pos = vec3(-10, -10, 10), .color = light_color },
} };
GPU_EncodeBindShaderData(enc, 3, Binding_Lights_GetLayout(&lights_data));
// TODO: Add shadowmap texture to uniforms
Mesh_pool* mesh_pool = Render_GetMeshPool();
Material_pool* material_pool = Render_GetMaterialPool();
for (size_t ent_i = 0; ent_i < entity_count; ent_i++) {
RenderEnt renderable = entities[ent_i];
Mesh* mesh = Mesh_pool_get(mesh_pool, renderable.mesh);
Material* mat = Material_pool_get(material_pool, renderable.material);
// upload material data
PBRMaterialUniforms material_data = { .mat = *mat };
GPU_EncodeBindShaderData(enc, 2, PBRMaterial_GetLayout(&material_data));
// upload model transform
Binding_Model model_data = { .model = renderable.affine };
GPU_EncodeBindShaderData(enc, 1, Binding_Model_GetLayout(&model_data));
// set buffers
GPU_EncodeSetVertexBuffer(enc, mesh->vertex_buffer);
GPU_EncodeSetIndexBuffer(enc, mesh->index_buffer);
// draw
GPU_EncodeDrawIndexedTris(enc, mesh->geometry.index_count);
}
GPU_CmdEncoder_EndRender(enc);
}
void PBRMaterial_BindData(ShaderDataLayout* layout, const void* data) {
PBRMaterialUniforms* d = (PBRMaterialUniforms*)data;
CASSERT(data);
CASSERT(layout->binding_count == 5);
TextureHandle white1x1 = Render_GetWhiteTexture();
if (d->mat.albedo_map.raw != INVALID_TEX_HANDLE.raw) {
layout->bindings[0].data.texture.handle = d->mat.albedo_map;
} else {
layout->bindings[0].data.texture.handle = white1x1;
}
// TODO .. the rest
}
ShaderDataLayout PBRMaterial_GetLayout(void* data) {
PBRMaterialUniforms* d = (PBRMaterialUniforms*)data;
bool has_data = data != NULL;
ShaderBinding b1 = {
.label = "albedoMap",
.kind = BINDING_TEXTURE,
};
ShaderBinding b2 = {
.label = "metallicRoughnessMap",
.kind = BINDING_TEXTURE,
};
ShaderBinding b3 = {
.label = "aoMap",
.kind = BINDING_TEXTURE,
};
ShaderBinding b4 = {
.label = "normalMap",
.kind = BINDING_TEXTURE,
};
ShaderBinding b5 = { .label = "PBR_Params",
.kind = BINDING_BYTES,
.data.bytes.size = sizeof(PBR_Params) };
if (has_data) {
TextureHandle white1x1 = Render_GetWhiteTexture();
if (d->mat.albedo_map.raw != INVALID_TEX_HANDLE.raw) {
b1.data.texture.handle = d->mat.albedo_map;
} else {
b1.data.texture.handle = white1x1;
}
if (d->mat.metallic_roughness_map.raw != INVALID_TEX_HANDLE.raw) {
b2.data.texture.handle = d->mat.metallic_roughness_map;
} else {
b2.data.texture.handle = white1x1;
}
if (d->mat.ambient_occlusion_map.raw != INVALID_TEX_HANDLE.raw) {
b3.data.texture.handle = d->mat.ambient_occlusion_map;
} else {
b3.data.texture.handle = white1x1;
}
if (d->mat.normal_map.raw != INVALID_TEX_HANDLE.raw) {
b4.data.texture.handle = d->mat.normal_map;
} else {
b4.data.texture.handle = white1x1;
}
arena* frame = Render_GetFrameArena();
PBR_Params* params = arena_alloc(frame, sizeof(PBR_Params));
params->albedo = d->mat.base_colour;
params->metallic = d->mat.metallic;
params->roughness = d->mat.roughness;
params->ambient_occlusion = d->mat.ambient_occlusion;
b5.data.bytes.data = params;
}
return (ShaderDataLayout){ .bindings = { b1, b2, b3, b4, b5 }, .binding_count = 5 };
}
Material PBRMaterialDefault() {
return (Material){ .name = "Standard Material",
.kind = MAT_PBR,
.base_colour = vec3(1.0, 1.0, 1.0),
.metallic = 0.0,
.roughness = 0.5,
.ambient_occlusion = 0.0,
.albedo_map = INVALID_TEX_HANDLE,
.metallic_roughness_map = INVALID_TEX_HANDLE,
.normal_map = INVALID_TEX_HANDLE,
.ambient_occlusion_map = INVALID_TEX_HANDLE };
}
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