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#include "shadows.h"
#include <string.h>
#include "file.h"
#include "glad/glad.h"
#include "log.h"
#include "maths.h"
#include "maths_types.h"
#include "primitives.h"
#include "ral_common.h"
#include "ral_impl.h"
#include "ral_types.h"
#include "render.h"
#include "render_scene.h"
#include "render_types.h"
#include "str.h"
ShaderDataLayout ShadowUniforms_GetLayout(void* data) {
ShadowUniforms* d = (ShadowUniforms*)data;
bool has_data = data != NULL;
ShaderBinding b1 = {
.label = "ShadowUniforms",
.kind = BINDING_BYTES,
.vis = VISIBILITY_VERTEX,
.data = { .bytes = { .size = sizeof(ShadowUniforms) } }
// TODO: split this into two bindings so we can update model matrix independently
};
if (has_data) {
b1.data.bytes.data = data;
}
return (ShaderDataLayout){ .binding_count = 1, .bindings = { b1 } };
}
ShaderDataLayout ShadowDebugQuad_GetLayout(void* data) {
TextureHandle* handle = data;
bool has_data = data != NULL;
ShaderBinding b1 = {
.label = "depthMap",
.kind = BINDING_TEXTURE,
.vis = VISIBILITY_FRAGMENT,
};
if (has_data) {
b1.data.texture.handle = *handle;
}
return (ShaderDataLayout){ .binding_count = 1, .bindings = { b1 } };
}
void Shadow_Init(Shadow_Storage* storage, u32 shadowmap_width, u32 shadowmap_height) {
memset(storage, 0, sizeof(Shadow_Storage));
arena scratch = arena_create(malloc(1024 * 1024), 1024 * 1024);
TextureDesc depthmap_desc = { .extents = u32x2(shadowmap_width, shadowmap_height),
.format = TEXTURE_FORMAT_DEPTH_DEFAULT,
.tex_type = TEXTURE_TYPE_2D };
DEBUG("Creating depth map texture for shadows");
TextureHandle depthmap = GPU_TextureCreate(depthmap_desc, false, NULL);
storage->depth_texture = depthmap;
// -- shadowmap drawing pass
GPU_RenderpassDesc rpass_desc = { .default_framebuffer = false,
.has_color_target = false,
.has_depth_stencil = true,
.depth_stencil = depthmap };
storage->shadowmap_pass = GPU_Renderpass_Create(rpass_desc);
WARN("About to laod shaders");
WARN("Shader paths: %s %s", "assets/shaders/shadows.vert", "assets/shaders/shadows.frag");
Str8 vert_path = str8("assets/shaders/shadows.vert");
Str8 frag_path = str8("assets/shaders/shadows.frag");
str8_opt vertex_shader = str8_from_file(&scratch, vert_path);
str8_opt fragment_shader = str8_from_file(&scratch, frag_path);
if (!vertex_shader.has_value || !fragment_shader.has_value) {
ERROR_EXIT("Failed to load shaders from disk");
}
ShaderData uniforms = { .data = NULL, .get_layout = &ShadowUniforms_GetLayout };
GraphicsPipelineDesc pipeline_desc = {
.debug_name = "Shadows Pipeline",
.vertex_desc = static_3d_vertex_description(),
.data_layouts = { uniforms },
.data_layouts_count = 1,
.vs = { .debug_name = "Shadows Vert shader",
.filepath = vert_path,
.code = vertex_shader.contents,
.is_spirv = false },
.fs = { .debug_name = "Shadows Frag shader",
.filepath = frag_path,
.code = fragment_shader.contents,
.is_spirv = false },
};
storage->shadowmap_pipeline = GPU_GraphicsPipeline_Create(pipeline_desc, storage->shadowmap_pass);
// -- debug quad pipeline
GPU_RenderpassDesc debug_pass_desc = { .default_framebuffer = true };
storage->debugquad_pass = GPU_Renderpass_Create(debug_pass_desc);
vert_path = str8("assets/shaders/debug_quad.vert");
frag_path = str8("assets/shaders/debug_quad.frag");
vertex_shader = str8_from_file(&scratch, vert_path);
fragment_shader = str8_from_file(&scratch, frag_path);
if (!vertex_shader.has_value || !fragment_shader.has_value) {
ERROR_EXIT("Failed to load shaders from disk");
}
ShaderData debugquad_uniforms = { .data = NULL, .get_layout = &ShadowDebugQuad_GetLayout };
GraphicsPipelineDesc debugquad_pipeline_desc = {
.debug_name = "Shadows debug quad Pipeline",
.vertex_desc = static_3d_vertex_description(),
.data_layouts = { debugquad_uniforms },
.data_layouts_count = 1,
.vs = { .debug_name = "depth debug quad vert shader",
.filepath = vert_path,
.code = vertex_shader.contents,
.is_spirv = false },
.fs = { .debug_name = "depth debug quad frag shader",
.filepath = frag_path,
.code = fragment_shader.contents,
.is_spirv = false },
};
storage->debugquad_pipeline =
GPU_GraphicsPipeline_Create(debugquad_pipeline_desc, storage->debugquad_pass);
Geometry quad_geo = Geo_CreatePlane(f32x2(1, 1));
// HACK: Swap vertices to make it face us
Vertex top0 = quad_geo.vertices->data[0];
quad_geo.vertices->data[0] = quad_geo.vertices->data[2];
quad_geo.vertices->data[2] = top0;
Vertex top1 = quad_geo.vertices->data[1];
quad_geo.vertices->data[1] = quad_geo.vertices->data[3];
quad_geo.vertices->data[3] = top1;
storage->quad = Mesh_Create(&quad_geo, false);
arena_free_storage(&scratch);
}
void Shadow_Run(RenderEnt* entities, size_t entity_count) {
Shadow_Storage* shadow_storage = Render_GetShadowStorage();
// calculations
RenderScene* render_scene = Render_GetScene();
f32 near_plane = 1.0, far_plane = 10.0;
// -- Not sure about how we want to handle lights
Vec3 light_position = { 1, 4, -1 };
// --
Mat4 light_projection = mat4_orthographic(-10.0, 10.0, -10.0, 10.0, near_plane, far_plane);
Mat4 light_view = mat4_look_at(light_position, VEC3_ZERO, VEC3_Y);
Mat4 light_space_matrix = mat4_mult(light_view, light_projection);
Shadow_ShadowmapExecute(shadow_storage, light_space_matrix, entities, entity_count);
}
void Shadow_DrawDebugQuad() {
Shadow_Storage* shadow_storage = Render_GetShadowStorage();
GPU_CmdEncoder* enc = GPU_GetDefaultEncoder();
GPU_CmdEncoder_BeginRender(enc, shadow_storage->debugquad_pass);
GPU_EncodeBindPipeline(enc, shadow_storage->debugquad_pipeline);
ShaderData quad_data = { .data = &shadow_storage->depth_texture,
.get_layout = ShadowDebugQuad_GetLayout };
GPU_EncodeBindShaderData(enc, 0, quad_data);
GPU_EncodeSetVertexBuffer(enc, shadow_storage->quad.vertex_buffer);
GPU_EncodeSetIndexBuffer(enc, shadow_storage->quad.index_buffer);
GPU_EncodeDrawIndexed(enc, shadow_storage->quad.geometry.indices->len);
GPU_CmdEncoder_EndRender(enc);
}
void Shadow_ShadowmapExecute(Shadow_Storage* storage, Mat4 light_space_transform,
RenderEnt* entities, size_t entity_count) {
GPU_CmdEncoder shadow_encoder = GPU_CmdEncoder_Create();
GPU_CmdEncoder_BeginRender(&shadow_encoder, storage->shadowmap_pass);
// DEBUG("Begin shadowmap renderpass");
// FIXME: shouldnt be gl specific
glClear(GL_DEPTH_BUFFER_BIT);
GPU_EncodeBindPipeline(&shadow_encoder, storage->shadowmap_pipeline);
ShadowUniforms uniforms = {
.light_space = light_space_transform,
.model = mat4_ident() // this will be overwritten for each Model
};
ShaderData shader_data = {
.data = &uniforms,
.get_layout = &ShadowUniforms_GetLayout,
};
for (size_t ent_i = 0; ent_i < entity_count; ent_i++) {
RenderEnt renderable = entities[ent_i];
if (renderable.flags && REND_ENT_CASTS_SHADOWS) {
// Model* model = MODEL_GET(renderable.model);
uniforms.model = renderable.affine; // update the model transform
Mesh* mesh = Mesh_pool_get(Render_GetMeshPool(), renderable.mesh);
GPU_EncodeBindShaderData(&shadow_encoder, 0, shader_data);
GPU_EncodeSetVertexBuffer(&shadow_encoder, mesh->vertex_buffer);
GPU_EncodeSetIndexBuffer(&shadow_encoder, mesh->index_buffer);
GPU_EncodeDrawIndexed(&shadow_encoder, mesh->geometry.indices->len);
}
}
GPU_CmdEncoder_EndRender(&shadow_encoder); // end renderpass
}
TextureHandle Shadow_GetShadowMapTexture(Shadow_Storage* storage) { return storage->depth_texture; }
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