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/**
* @brief
*/
#include "terrain.h"
#include <assert.h>
#include "file.h"
#include "glad/glad.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 "shader_layouts.h"
#include "str.h"
#define TERRAIN_GRID_U 505
#define TERRAIN_GRID_V 505
bool Terrain_Init(Terrain_Storage* storage) {
storage->grid_dimensions = u32x2(TERRAIN_GRID_U, TERRAIN_GRID_V);
storage->hmap_loaded = false;
GPU_RenderpassDesc rpass_desc = {
.default_framebuffer = true,
};
storage->hmap_renderpass = GPU_Renderpass_Create(rpass_desc);
arena scratch = arena_create(malloc(1024 * 1024), 1024 * 1024);
Str8 vert_path = str8("assets/shaders/terrain.vert");
Str8 frag_path = str8("assets/shaders/terrain.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")
}
ShaderDataLayout camera_data = Binding_Camera_GetLayout(NULL);
ShaderDataLayout terrain_data = TerrainUniforms_GetLayout(NULL);
GraphicsPipelineDesc pipeline_desc = {
.debug_name = "terrain rendering pipeline",
.vertex_desc = static_3d_vertex_description(),
.data_layouts = { camera_data, terrain_data },
.data_layouts_count = 2,
.vs = {
.debug_name = "terrain vertex shader",
.filepath = vert_path,
.code = vertex_shader.contents,
},
.fs = {
.debug_name = "terrain fragment shader",
.filepath = frag_path,
.code = fragment_shader.contents,
},
.wireframe = false,
};
storage->hmap_pipeline = GPU_GraphicsPipeline_Create(pipeline_desc, storage->hmap_renderpass);
storage->texture = TextureLoadFromFile("assets/demo/textures/grass2.png");
return true;
}
void Terrain_Shutdown(Terrain_Storage* storage) {}
void Terrain_LoadHeightmap(Terrain_Storage* storage, Heightmap hmap, f32 grid_scale,
bool free_on_upload) {
// If there's a current one we will delete it and reallocate buffers
if (storage->hmap_loaded) {
GPU_BufferDestroy(storage->vertex_buffer);
GPU_BufferDestroy(storage->index_buffer);
}
u32 width = hmap.pixel_dimensions.x;
u32 height = hmap.pixel_dimensions.y;
storage->grid_scale = grid_scale;
size_t num_vertices = storage->grid_dimensions.x * storage->grid_dimensions.y;
storage->num_vertices = num_vertices;
Vertex_darray* vertices = Vertex_darray_new(num_vertices);
u32 index = 0;
for (u32 i = 0; i < storage->grid_dimensions.x; i++) {
for (u32 j = 0; j < storage->grid_dimensions.y; j++) {
size_t position = j * storage->grid_dimensions.x + i;
u8* bytes = hmap.image_data;
u8 channel = bytes[position];
float value = (float)channel / 255.0;
// printf("(%d, %d) %d : %f \n", i, j, channel, value);
assert(index < num_vertices);
f32 height = Heightmap_HeightXZ(&hmap, i, j);
Vec3 v_pos = vec3_create(i * grid_scale, height, j * grid_scale);
Vec3 v_normal = VEC3_Y;
float tiling_factor = 505.0f;
Vec2 v_uv = vec2((f32)i / width * tiling_factor, (f32)j / height * tiling_factor);
Vertex v = { .static_3d = { .position = v_pos, .normal = v_normal, .tex_coords = v_uv } };
Vertex_darray_push(vertices, v);
index++;
}
}
BufferHandle vertices_handle = GPU_BufferCreate(num_vertices * sizeof(Vertex), BUFFER_VERTEX,
BUFFER_FLAG_GPU, vertices->data);
storage->vertex_buffer = vertices_handle;
u32 quad_count = (width - 1) * (height - 1);
u32 indices_count = quad_count * 6;
storage->indices_count = indices_count;
u32_darray* indices = u32_darray_new(indices_count);
for (u32 i = 0; i < (width - 1); i++) { // row
for (u32 j = 0; j < (height - 1); j++) { // col
u32 bot_left = i * width + j;
u32 top_left = (i + 1) * width + j;
u32 top_right = (i + 1) * width + (j + 1);
u32 bot_right = i * width + j + 1;
// top left tri
u32_darray_push(indices, top_right);
u32_darray_push(indices, top_left);
u32_darray_push(indices, bot_left);
// bottom right tri
u32_darray_push(indices, bot_right);
u32_darray_push(indices, top_right);
u32_darray_push(indices, bot_left);
}
}
BufferHandle indices_handle =
GPU_BufferCreate(indices_count * sizeof(u32), BUFFER_INDEX, BUFFER_FLAG_GPU, indices->data);
storage->index_buffer = indices_handle;
}
Heightmap Heightmap_FromImage(Str8 filepath) {
size_t max_size = MB(16);
arena arena = arena_create(malloc(max_size), max_size);
// str8_opt maybe_file = str8_from_file(&arena, filepath);
// assert(maybe_file.has_value);
TextureData hmap_tex = TextureDataLoad(Str8_to_cstr(&arena, filepath), false);
// arena_free_storage(&arena);
return (Heightmap){
.pixel_dimensions = hmap_tex.description.extents,
.filepath = filepath,
.image_data = hmap_tex.image_data,
.num_channels = hmap_tex.description.num_channels,
.is_uploaded = false,
};
}
void Terrain_Draw(Terrain_Storage* storage) {
GPU_CmdEncoder* enc = GPU_GetDefaultEncoder();
GPU_EncodeBindPipeline(enc, storage->hmap_pipeline);
RenderScene* scene = Render_GetScene();
Mat4 view, proj;
u32x2 dimensions = GPU_Swapchain_GetDimensions();
Camera_ViewProj(&scene->camera, (f32)dimensions.x, (f32)dimensions.y, &view, &proj);
Binding_Camera camera_data = { .view = view,
.projection = proj,
.viewPos = vec4(scene->camera.position.x, scene->camera.position.y,
scene->camera.position.z, 1.0) };
GPU_EncodeBindShaderData(enc, 0, Binding_Camera_GetLayout(&camera_data));
TerrainUniforms uniforms = { .tex_slot_1 = storage->texture };
ShaderDataLayout terrain_data = TerrainUniforms_GetLayout(&uniforms);
GPU_EncodeBindShaderData(enc, 1, terrain_data);
GPU_EncodeSetVertexBuffer(enc, storage->vertex_buffer);
GPU_EncodeSetIndexBuffer(enc, storage->index_buffer);
GPU_EncodeDrawIndexed(enc, storage->indices_count);
// glDrawArrays(GL_POINTS, 0, storage->num_vertices);
}
f32 Heightmap_HeightXZ(const Heightmap* hmap, u32 x, u32 z) {
// its single channel so only one byte per pixel
size_t position = x * hmap->pixel_dimensions.x + z;
u8* bytes = hmap->image_data;
u8 channel = bytes[position];
float value = (float)channel / 2.0; /// 255.0;
return value;
}
ShaderDataLayout TerrainUniforms_GetLayout(void* data) {
TerrainUniforms* d = data;
bool has_data = data != NULL;
ShaderBinding b1 = {
.label = "TextureSlot1",
.kind = BINDING_TEXTURE,
.vis = VISIBILITY_FRAGMENT,
};
if (has_data) {
b1.data.texture.handle = d->tex_slot_1;
}
return (ShaderDataLayout){ .bindings = { b1 }, .binding_count = 1 };
}
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