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Add batch rendering functionality to Renderer2D

master
Riyyi 3 years ago
parent
5f36f3d83a
commit
cc4464558a
2 changed files with 267 additions and 28 deletions
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  1. 229
      inferno/src/inferno/render/renderer.cpp
  2. 66
      inferno/src/inferno/render/renderer.h

229
inferno/src/inferno/render/renderer.cpp
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@ -1,3 +1,5 @@
#include <algorithm> // std::min
#include <glad/glad.h>
#include "inferno/component/transform.h"
@ -19,45 +21,236 @@ namespace Inferno {
glClearColor(color.r, color.g, color.b, color.a);
}
void RenderCommand::drawIndexed(const std::shared_ptr<VertexArray>& vertexArray)
void RenderCommand::drawIndexed(const std::shared_ptr<VertexArray>& vertexArray, uint32_t indexCount)
{
glDrawElements(GL_TRIANGLES, vertexArray->getIndexBuffer()->getCount(), GL_UNSIGNED_INT, nullptr);
uint32_t count = indexCount ? indexCount : vertexArray->getIndexBuffer()->getCount();
glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, nullptr);
}
int32_t RenderCommand::textureUnitAmount()
{
int32_t amount = 0;
glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &amount);
return amount;
}
// -----------------------------------------
std::shared_ptr<Camera> Renderer2D::s_camera = nullptr;
QuadBatch* Renderer2D::s_quadBatch;
void Renderer2D::initialize()
{
s_quadBatch = new QuadBatch();
// CPU
// -----------------------------------------
std::shared_ptr<Camera> Renderer2D::m_camera = nullptr;
// Create array for storing quads vertices
s_quadBatch->vertexBufferBase = std::shared_ptr<QuadVertex[]>(new QuadVertex[QuadBatch::vertexCount]);
s_quadBatch->vertexBufferPtr = s_quadBatch->vertexBufferBase.get();
// Set basic quad vertex positions
s_quadBatch->vertexPositions[0] = { -0.5f, -0.5f, 0.0f, 1.0f };
s_quadBatch->vertexPositions[1] = { 0.5f, -0.5f, 0.0f, 1.0f };
s_quadBatch->vertexPositions[2] = { 0.5f, 0.5f, 0.0f, 1.0f };
s_quadBatch->vertexPositions[3] = { -0.5f, 0.5f, 0.0f, 1.0f };
// Create texture unit samplers
int32_t samplers[s_quadBatch->textureUnitPerBatch];
for (uint32_t i = 0; i < s_quadBatch->textureUnitPerBatch; i++) {
samplers[i] = i;
}
// Get amount of texture units supported by the GPU
uint32_t constTextureUnitCount = QuadBatch::textureUnitPerBatch;
uint32_t gpuTextureUnitCount = RenderCommand::textureUnitAmount();
s_quadBatch->supportedTextureUnitPerBatch = std::min(constTextureUnitCount, gpuTextureUnitCount);
// Texture unit 0 is reserved for no texture
s_quadBatch->textureUnits[0] = nullptr;
// GPU
// -----------------------------------------
// Create shader
s_quadBatch->shader = std::make_shared<Shader>("assets/glsl/batch-quad");
s_quadBatch->shader->bind();
s_quadBatch->shader->setInt("u_textures", samplers, s_quadBatch->textureUnitPerBatch);
s_quadBatch->shader->unbind();
// Create vertex array
s_quadBatch->vertexArray = std::make_shared<VertexArray>();
// Create vertex buffer
s_quadBatch->vertexBuffer = std::make_shared<VertexBuffer>(sizeof(QuadVertex) * QuadBatch::vertexCount);
s_quadBatch->vertexBuffer->setLayout({
{ BufferElementType::Vec3, "a_position" },
{ BufferElementType::Vec4, "a_color" },
{ BufferElementType::Vec2, "a_textureCoordinates" },
{ BufferElementType::Float, "a_textureIndex" },
});
s_quadBatch->vertexArray->addVertexBuffer(s_quadBatch->vertexBuffer);
// Generate indices
uint32_t* indices = new uint32_t[QuadBatch::indexCount];
uint32_t offset = 0;
for (uint32_t i = 0; i < QuadBatch::indexCount; i += QuadBatch::indexPerQuad) {
indices[i + 0] = offset + 0;
indices[i + 1] = offset + 1;
indices[i + 2] = offset + 2;
indices[i + 3] = offset + 2;
indices[i + 4] = offset + 3;
indices[i + 5] = offset + 0;
offset += QuadBatch::vertexPerQuad;
}
// Create index buffer
std::shared_ptr<IndexBuffer> indexBuffer = std::make_shared<IndexBuffer>(indices, sizeof(uint32_t) * QuadBatch::indexCount);
s_quadBatch->vertexArray->setIndexBuffer(indexBuffer);
delete[] indices;
dbg(Log::Info) << "Renderer2D initialized";
}
void Renderer2D::destroy()
{
delete s_quadBatch;
}
void Renderer2D::beginScene(const std::shared_ptr<Camera>& camera)
{
m_camera = camera;
s_camera = camera;
}
void Renderer2D::endScene()
{
nextBatch();
}
void Renderer2D::drawQuad(std::shared_ptr<Transform> transform, glm::vec4 color)
{
drawQuad(transform, color, nullptr);
}
void Renderer2D::drawQuad(std::shared_ptr<Transform> transform, glm::mat4 color)
{
drawQuad(transform, color, nullptr);
}
void Renderer2D::drawQuad(std::shared_ptr<Transform> transform, glm::vec4 color, std::shared_ptr<Texture> texture)
{
drawQuad(transform, glm::mat4(color, color, color, color), texture);
}
void Renderer2D::submit(const std::shared_ptr<VertexArray>& vertexArray)
void Renderer2D::drawQuad(std::shared_ptr<Transform> transform, glm::mat4 color, std::shared_ptr<Texture> texture)
{
vertexArray->bind();
RenderCommand::drawIndexed(vertexArray);
vertexArray->unbind();
// Create a new batch if the quad limit has been reached
if (s_quadBatch->quadCount >= QuadBatch::quads) {
nextBatch();
}
constexpr glm::vec2 textureCoordinates[] = {
{ 0.0f, 0.0f }, { 1.0f, 0.0f }, { 1.0f, 1.0f }, { 0.0f, 1.0f }
};
uint32_t textureUnitIndex = addTextureUnit(texture);
// Add the quads 4 vertices
for (uint32_t i = 0; i < QuadBatch::vertexPerQuad; i++) {
s_quadBatch->vertexBufferPtr->position = transform->transform() * s_quadBatch->vertexPositions[i];
s_quadBatch->vertexBufferPtr->color = color[i];
s_quadBatch->vertexBufferPtr->textureCoordinates = textureCoordinates[i];
s_quadBatch->vertexBufferPtr->textureIndex = (float)textureUnitIndex;
s_quadBatch->vertexBufferPtr++;
}
s_quadBatch->quadCount++;
}
void Renderer2D::submit(const RenderBundle& bundle)
uint32_t Renderer2D::addTextureUnit(std::shared_ptr<Texture> texture)
{
bundle.shader->bind();
if (bundle.texture) bundle.texture->bind();
bundle.vertexArray->bind();
if (texture == nullptr) {
return 0;
}
// Create a new batch if the texture unit limit has been reached
if (s_quadBatch->textureUnitIndex >= s_quadBatch->supportedTextureUnitPerBatch) {
nextBatch();
}
// If texure was already added
for (uint32_t i = 1; i < s_quadBatch->textureUnitIndex; i++) {
if (s_quadBatch->textureUnits[i] == texture) {
return i;
}
}
bundle.shader->setFloat("u_projectionView", m_camera->projection() * m_camera->transform()->transform());
bundle.shader->setFloat("u_model", bundle.transform->transform());
RenderCommand::drawIndexed(bundle.vertexArray);
// Add texture
uint32_t textureUnitIndex = s_quadBatch->textureUnitIndex;
s_quadBatch->textureUnits[textureUnitIndex] = texture;
s_quadBatch->textureUnitIndex++;
bundle.vertexArray->unbind();
if (bundle.texture) bundle.texture->unbind();
bundle.shader->unbind();
return textureUnitIndex;
}
void Renderer2D::bind()
{
s_quadBatch->shader->bind();
for (uint32_t i = 1; i < s_quadBatch->textureUnitIndex; i++) {
s_quadBatch->textureUnits[i]->bind(i);
}
s_quadBatch->vertexArray->bind();
}
void Renderer2D::unbind()
{
s_quadBatch->vertexArray->unbind();
for (uint32_t i = 1; i < s_quadBatch->textureUnitIndex; i++) {
s_quadBatch->textureUnits[i]->unbind();
}
s_quadBatch->shader->unbind();
}
void Renderer2D::flush()
{
if (s_quadBatch->quadCount == 0) {
return;
}
// Upload vertex data to GPU
s_quadBatch->vertexBuffer->uploadData(
s_quadBatch->vertexBufferBase.get(),
s_quadBatch->quadCount * QuadBatch::vertexPerQuad * sizeof(QuadVertex));
bind();
// Render
s_quadBatch->shader->setFloat("u_projectionView", s_camera->projection() * s_camera->transform()->transform());
RenderCommand::drawIndexed(s_quadBatch->vertexArray, s_quadBatch->quadCount * QuadBatch::indexPerQuad);
unbind();
}
void Renderer2D::startBatch()
{
s_quadBatch->quadCount = 0;
s_quadBatch->vertexBufferPtr = s_quadBatch->vertexBufferBase.get();
s_quadBatch->textureUnitIndex = 1;
}
void Renderer2D::nextBatch()
{
flush();
startBatch();
}
}

66
inferno/src/inferno/render/renderer.h
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@ -1,9 +1,13 @@
#ifndef RENDERER_H
#define RENDERER_H
#include <cstdint> // std::uint32_t
#include <memory> // std::shared_ptr
#include "glm/ext/vector_float4.hpp" // glm::vec4
#include "glm/ext/matrix_float4x4.hpp" // glm::mat4
#include "glm/ext/vector_float2.hpp" // glm::vec2
#include "glm/ext/vector_float3.hpp" // glm::vec3
#include "glm/ext/vector_float4.hpp" // glm::vec4
namespace Inferno {
@ -11,35 +15,77 @@ namespace Inferno {
class Shader;
class Texture;
class Transform;
class VertexBuffer;
class VertexArray;
struct RenderBundle {
const std::shared_ptr<Shader>& shader;
const std::shared_ptr<Texture>& texture;
const std::shared_ptr<Transform>& transform;
const std::shared_ptr<VertexArray>& vertexArray;
struct QuadVertex {
glm::vec3 position = { 0.0f, 0.0f, 0.0f };
glm::vec4 color = { 1.0f, 1.0f, 1.0f, 1.0f };
glm::vec2 textureCoordinates = { 0.0f, 0.0f };
float textureIndex = 0; // @Todo get int to pass to fragment correctly
};
struct QuadBatch {
static const uint32_t vertexPerQuad = 4;
static const uint32_t indexPerQuad = 6;
static const uint32_t quads = 1000;
static const uint32_t vertexCount = quads * vertexPerQuad;
static const uint32_t indexCount = quads * indexPerQuad;
static const uint32_t textureUnitPerBatch = 32;
uint32_t quadCount = 0;
std::shared_ptr<QuadVertex[]> vertexBufferBase = nullptr;
QuadVertex* vertexBufferPtr = nullptr;
glm::vec4 vertexPositions[vertexPerQuad];
uint32_t supportedTextureUnitPerBatch = 0;
uint32_t textureUnitIndex = 1;
std::array<std::shared_ptr<Texture>, textureUnitPerBatch> textureUnits;
std::shared_ptr<Shader> shader = nullptr;
std::shared_ptr<VertexBuffer> vertexBuffer = nullptr;
std::shared_ptr<VertexArray> vertexArray = nullptr;
};
// -----------------------------------------
class RenderCommand {
public:
static void clear();
static void clearColor(const glm::vec4& color);
static void drawIndexed(const std::shared_ptr<VertexArray>& vertexArray);
static void drawIndexed(const std::shared_ptr<VertexArray>& vertexArray, uint32_t indexCount = 0);
static int32_t textureUnitAmount();
};
// -----------------------------------------
class Renderer2D {
public:
static void initialize();
static void destroy();
static void beginScene(const std::shared_ptr<Camera>& camera);
static void endScene();
static void submit(const std::shared_ptr<VertexArray>& vertexArray);
static void submit(const RenderBundle& bundle);
static void drawQuad(std::shared_ptr<Transform> transform, glm::vec4 color);
static void drawQuad(std::shared_ptr<Transform> transform, glm::mat4 color);
static void drawQuad(std::shared_ptr<Transform> transform, glm::vec4 color, std::shared_ptr<Texture> texture);
static void drawQuad(std::shared_ptr<Transform> transform, glm::mat4 color, std::shared_ptr<Texture> texture);
private:
static std::shared_ptr<Camera> m_camera;
static uint32_t addTextureUnit(std::shared_ptr<Texture> texture);
static void bind();
static void unbind();
static void flush();
static void startBatch();
static void nextBatch();
static std::shared_ptr<Camera> s_camera;
static QuadBatch* s_quadBatch;
};
}

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