wip shadows

6 files changed, 209 insertions, 56 deletions

diff --git a/src/new_render/render.c b/src/new_render/render.c
index cfd0b11..21046ea 100644
--- a/src/new_render/render.c
+++ b/src/new_render/render.c
@@ -2,17 +2,18 @@
  * @brief
  */
 
-#include <glfw3.h>
 #include "render.h"
-#include "core.h"
+#include <glfw3.h>
 #include "camera.h"
 #include "colours.h"
+#include "core.h"
 #include "log.h"
 #include "maths.h"
 #include "maths_types.h"
 #include "pbr.h"
 #include "ral_common.h"
 #include "ral_impl.h"
+#include "ral_types.h"
 #include "render_scene.h"
 #include "render_types.h"
 #include "shadows.h"
@@ -35,30 +36,30 @@ struct Renderer {
 };
 
 bool Renderer_Init(RendererConfig config, Renderer* ren) {
-    INFO("Renderer init");
+  INFO("Renderer init");
 
-    // init resource pools
-    DEBUG("Initialise GPU resource pools");
-    arena pool_arena = arena_create(malloc(1024 * 1024), 1024 * 1024);
-    ren->resource_pools = arena_alloc(&pool_arena, sizeof(struct ResourcePools));
-    ResourcePools_Init(&pool_arena, ren->resource_pools);
+  // init resource pools
+  DEBUG("Initialise GPU resource pools");
+  arena pool_arena = arena_create(malloc(1024 * 1024), 1024 * 1024);
+  ren->resource_pools = arena_alloc(&pool_arena, sizeof(struct ResourcePools));
+  ResourcePools_Init(&pool_arena, ren->resource_pools);
 
   // GLFW window creation
 
   // NOTE: all platforms use GLFW at the moment but thats subject to change
   glfwInit();
 
-  #if defined(CEL_REND_BACKEND_OPENGL)
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
-    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
-  #elif defined(CEL_REND_BACKEND_VULKAN)
-    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
-  #endif
-
-  GLFWwindow* window = glfwCreateWindow(config.scr_width, config.scr_height,
-                                        config.window_name, NULL, NULL);
+#if defined(CEL_REND_BACKEND_OPENGL)
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#elif defined(CEL_REND_BACKEND_VULKAN)
+  glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+#endif
+
+  GLFWwindow* window =
+      glfwCreateWindow(config.scr_width, config.scr_height, config.window_name, NULL, NULL);
   if (window == NULL) {
     ERROR("Failed to create GLFW window\n");
     glfwTerminate();
@@ -76,7 +77,6 @@ bool Renderer_Init(RendererConfig config, Renderer* ren) {
   GPU_Device_Create(&ren->device);
   GPU_Swapchain_Create(&ren->swapchain);
 
-
   // set up default scene
   Camera default_cam =
       Camera_Create(vec3(0.0, 2.0, 4.0), vec3_normalise(vec3(0.0, -2.0, -4.0)), VEC3_Y, 45.0);
@@ -90,46 +90,57 @@ bool Renderer_Init(RendererConfig config, Renderer* ren) {
   return true;
 }
 
-void Renderer_Shutdown(Renderer* renderer) { }
+void Renderer_Shutdown(Renderer* ren) {}
 size_t Renderer_GetMemReqs() { return sizeof(Renderer); }
 
-void Render_FrameBegin(Renderer *renderer) {
-    renderer->frame_aborted = false;
-    if (GPU_Backend)
-
+void Render_FrameBegin(Renderer* ren) {
+  ren->frame_aborted = false;
+  if (!GPU_Backend_BeginFrame()) {
+    ren->frame_aborted = true;
+    WARN("Frame aborted");
+    return;
+  }
 }
-void Render_FrameEnd(Renderer* renderer) {
+void Render_FrameEnd(Renderer* ren) {
+  if (ren->frame_aborted) {
+    return;
+  }
 
+  GPU_CmdEncoder* enc = GPU_GetDefaultEncoder();
 }
 void Render_RenderEntities(RenderEnt* entities, size_t entity_count) {
-    Renderer* ren = Core_GetRenderer(&g_core);
-
-    GPU_CmdEncoder* enc = GPU_GetDefaultEncoder();
-    // bind shadow
-    GPU_EncodeBindPipeline(enc, ren->shadows)
-
+  Renderer* ren = Core_GetRenderer(&g_core);
+  RenderScene scene = ren->scene;
+
+  // -- Shadows
+  f32 near_plane = 1.0, far_plane = 10.0;
+  Mat4 light_projection = mat4_orthographic(-10.0, 10.0, -10.0, 10.0, near_plane, far_plane);
+  Vec3 pos = vec3_negate(scene.sun.direction);
+  Mat4 light_view = mat4_look_at(pos, VEC3_ZERO, VEC3_Y);
+  Mat4 light_space_matrix = mat4_mult(light_view, light_projection);
+  Shadow_ShadowmapExecute(ren->shadows, light_space_matrix, entities, entity_count);
 }
 
 Mesh Mesh_Create(Geometry* geometry, bool free_on_upload) {
-    Mesh m = { 0 };
-
-    // Create and upload vertex buffer
-    size_t vert_bytes = geometry->vertices->len * sizeof(Vertex);
-    INFO("Creating vertex buffer with size %d (%d x %d)", vert_bytes, geometry->vertices->len,
-         sizeof(Vertex));
-    m.vertex_buffer = GPU_BufferCreate(vert_bytes, BUFFER_VERTEX, BUFFER_FLAG_GPU,
-                                        geometry->vertices->data);
-
-    // Create and upload index buffer
-    size_t index_bytes = geometry->indices->len * sizeof(u32);
-    INFO("Creating index buffer with size %d (len: %d)", index_bytes, geometry->indices->len);
-    m.index_buffer = GPU_BufferCreate(index_bytes, BUFFER_INDEX, BUFFER_FLAG_GPU,
-                                       geometry->indices->data);
-
-    m.is_uploaded = true;
-    m.geometry = geometry;
-    if (free_on_upload) {
-      Geometry_Destroy(geometry);
-    }
-    return m;
+  Mesh m = { 0 };
+
+  // Create and upload vertex buffer
+  size_t vert_bytes = geometry->vertices->len * sizeof(Vertex);
+  INFO("Creating vertex buffer with size %d (%d x %d)", vert_bytes, geometry->vertices->len,
+       sizeof(Vertex));
+  m.vertex_buffer =
+      GPU_BufferCreate(vert_bytes, BUFFER_VERTEX, BUFFER_FLAG_GPU, geometry->vertices->data);
+
+  // Create and upload index buffer
+  size_t index_bytes = geometry->indices->len * sizeof(u32);
+  INFO("Creating index buffer with size %d (len: %d)", index_bytes, geometry->indices->len);
+  m.index_buffer =
+      GPU_BufferCreate(index_bytes, BUFFER_INDEX, BUFFER_FLAG_GPU, geometry->indices->data);
+
+  m.is_uploaded = true;
+  m.geometry = geometry;
+  if (free_on_upload) {
+    Geometry_Destroy(geometry);
+  }
+  return m;
 }
diff --git a/src/new_render/render_scene.h b/src/new_render/render_scene.h
index 7591d8f..791e862 100644
--- a/src/new_render/render_scene.h
+++ b/src/new_render/render_scene.h
@@ -11,7 +11,7 @@
  *         Whenever you call draw functions you can think of this as an implicit parameter. */
 typedef struct RenderScene {
     Camera camera;
-    PointLight light;
+    DirectionalLight sun;
 } RenderScene;
 
 // --- Public APIs
diff --git a/src/new_render/render_types.h b/src/new_render/render_types.h
index 1cf6c7e..81cf1c3 100644
--- a/src/new_render/render_types.h
+++ b/src/new_render/render_types.h
@@ -32,6 +32,10 @@ typedef struct Mesh {
   Geometry* geometry; // NULL means it has been freed CPU-side
   bool is_uploaded; // has the data been uploaded to the GPU
 } Mesh;
+#ifndef TYPED_MESH_ARRAY
+KITC_DECL_TYPED_ARRAY(Mesh)
+#define TYPED_MESH_ARRAY
+#endif
 
 typedef struct TextureData {
     TextureDesc description;
@@ -54,6 +58,7 @@ typedef struct Material {
 
 typedef struct Model {
   // meshes
+  Mesh_darray* meshes;
   // materials
 } Model;
 
diff --git a/src/new_render/shader_layouts.h b/src/new_render/shader_layouts.h
new file mode 100644
index 0000000..d1ed1cc
--- /dev/null
+++ b/src/new_render/shader_layouts.h
@@ -0,0 +1,3 @@
+#pragma once
+#include "maths_types.h"
+#include "ral_types.h"
diff --git a/src/new_render/shadows.c b/src/new_render/shadows.c
new file mode 100644
index 0000000..df836b4
--- /dev/null
+++ b/src/new_render/shadows.c
@@ -0,0 +1,125 @@
+#include <string.h>
+#include "shadows.h"
+#include "core.h"
+#include "log.h"
+#include "maths.h"
+#include "ral_common.h"
+#include "ral_impl.h"
+#include "ral_types.h"
+#include "render.h"
+#include "render_scene.h"
+#include "render_types.h"
+
+typedef struct ShadowUniforms {
+  Mat4 light_space;
+  Mat4 model;
+} ShadowUniforms;
+
+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 } };
+}
+
+void Shadow_Init(Shadow_Storage* storage, u32x2 shadowmap_extents) {
+  memset(storage, 0, sizeof(Shadow_Storage));
+  arena scratch = arena_create(malloc(1024 * 1024), 1024 * 1024);
+
+  TextureDesc depthmap_desc = { .extents = shadowmap_extents,
+                                .format = TEXTURE_FORMAT_DEPTH_DEFAULT,
+                                .tex_type = TEXTURE_TYPE_2D };
+  TextureHandle depthmap = GPU_TextureCreate(depthmap_desc, false, NULL);
+  storage->depth_texture = depthmap;
+
+  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);
+
+  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->pipeline = GPU_GraphicsPipeline_Create(pipeline_desc, storage->shadowmap_pass);
+
+  arena_free_storage(&scratch);
+}
+
+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");
+
+  GPU_EncodeBindPipeline(&shadow_encoder, storage->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.casts_shadows) {
+      Model* model = MODEL_GET(renderable.model);
+
+      uniforms.model = renderable.affine;  // update the model transform
+
+      size_t num_meshes = Mesh_darray_len(model->meshes);
+      for (u32 mesh_i = 0; mesh_i < num_meshes; mesh_i++) {
+        Mesh mesh = model->meshes->data[mesh_i];
+
+        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
+}
+
+Handle Shadow_GetShadowMapTexture(Shadow_Storage* storage) {
+  return (Handle){ .raw = storage->depth_texture.raw };
+}
diff --git a/src/new_render/shadows.h b/src/new_render/shadows.h
index 82ded5c..81711de 100644
--- a/src/new_render/shadows.h
+++ b/src/new_render/shadows.h
@@ -6,9 +6,17 @@
 #pragma once
 #include "defines.h"
 #include "ral.h"
+#include "ral_impl.h"
+#include "ral_types.h"
 #include "render_types.h"
 
-typedef struct Shadow_Storage Shadow_Storage;
+typedef struct Shadow_Storage {
+    GPU_Renderpass* shadowmap_pass;
+    GPU_Pipeline* pipeline;
+    bool debug_quad_enabled;
+    TextureHandle depth_texture;
+    // TODO: Some statistics tracking
+} Shadow_Storage;
 
 typedef struct Camera Camera;
 typedef struct Mat4 Mat4;
@@ -26,4 +34,5 @@ PUB Handle Shadow_GetShadowMapTexture(Shadow_Storage* storage);
 // --- Internal
 GPU_Renderpass* Shadow_RPassCreate(); // Creates the render pass
 GPU_Pipeline*   Shadow_PipelineCreate(GPU_Renderpass* rpass); // Creates the pipeline
-void Shadow_ShadowmapExecute(Shadow_Storage* storage, Mat4 light_space_transform, RenderEnt* entites, size_t entity_count);
+void Shadow_ShadowmapExecute(Shadow_Storage* storage, Mat4 light_space_transform, RenderEnt* entities, size_t entity_count);
+void Shadow_RenderDebugQuad();