fixing shadows.

1 files changed, 103 insertions, 6 deletions

diff --git a/src/new_render/shadows.c b/src/new_render/shadows.c
index 9a44e55..758a969 100644
--- a/src/new_render/shadows.c
+++ b/src/new_render/shadows.c
@@ -2,8 +2,10 @@
 #include <string.h>
 #include "core.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"
@@ -30,16 +32,34 @@ ShaderDataLayout ShadowUniforms_GetLayout(void* data) {
   return (ShaderDataLayout){ .binding_count = 1, .bindings = { b1 } };
 }
 
-void Shadow_Init(Shadow_Storage* storage, u32x2 shadowmap_extents) {
+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 = shadowmap_extents,
+  TextureDesc depthmap_desc = { .extents = u32x2(shadowmap_width, shadowmap_height),
                                 .format = TEXTURE_FORMAT_DEPTH_DEFAULT,
                                 .tex_type = TEXTURE_TYPE_2D };
   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,
@@ -71,19 +91,96 @@ void Shadow_Init(Shadow_Storage* storage, u32x2 shadowmap_extents) {
             .code = fragment_shader.contents,
             .is_spirv = false },
   };
-  storage->pipeline = GPU_GraphicsPipeline_Create(pipeline_desc, storage->shadowmap_pass);
+  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");
+  // DEBUG("Begin shadowmap renderpass");
+
+  // FIXME: shouldnt be gl specific
+  glClear(GL_DEPTH_BUFFER_BIT);
 
-  GPU_EncodeBindPipeline(&shadow_encoder, storage->pipeline);
+  GPU_EncodeBindPipeline(&shadow_encoder, storage->shadowmap_pipeline);
 
   ShadowUniforms uniforms = {
     .light_space = light_space_transform,