From 165040985e824281a686b37fca32d493602b2ffc Mon Sep 17 00:00:00 2001
From: ubuntu20 <klm777x7@gmail.com>
Date: Mon, 9 Nov 2020 10:13:27 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0texture2d=E7=B1=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Scene.cpp                  |  2 +-
 Texture.cpp                | 39 ++++++++++++++++++++++++++++++++++++++
 Texture.h                  | 16 ++++++++++++++++
 raytracing.vcxproj         |  3 +++
 raytracing.vcxproj.filters |  6 ++++++
 util.cpp                   | 37 ++++++++++++++++++++++++++++++++++++
 util.h                     |  2 ++
 7 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 Texture.cpp
 create mode 100644 Texture.h

diff --git a/Scene.cpp b/Scene.cpp
index 2a1fcc6..b0951a7 100644
--- a/Scene.cpp
+++ b/Scene.cpp
@@ -13,7 +13,7 @@ static Camera* sCamera = nullptr;
 Sphere sphere(Vector3(0.0f, 0.5f, 0.0f), 0.5f);
 static Object* sRootObject = nullptr;
 static Material* lambert = nullptr;
-static int sSampleCount = 128;
+static int sSampleCount = 6;
 static int sMaxBounceTime = 30;
 void AddObject(Object* object) {
 	if (sRootObject == nullptr) {
diff --git a/Texture.cpp b/Texture.cpp
new file mode 100644
index 0000000..8640092
--- /dev/null
+++ b/Texture.cpp
@@ -0,0 +1,39 @@
+#include "Texture.h"
+#include "util.h"
+
+TextureRGB::TextureRGB()
+{
+	mImageFileContent = nullptr;
+	mRGBPixel = nullptr;
+	mWidth = 0;
+	mHeight = 0;
+}
+
+TextureRGB::~TextureRGB()
+{
+	if (mImageFileContent) {
+		delete[] mImageFileContent;
+	}
+}
+
+void TextureRGB::Set(const char * image_path)
+{
+	int file_size = 0;
+	mImageFileContent = LoadFileContent(image_path, file_size);
+	mRGBPixel = DecodeBMP(mImageFileContent, mWidth, mHeight);
+}
+
+Vector3 TextureRGB::Sample(float u, float v)
+{
+	int x = int(u * mWidth);
+	int y = int(u * mHeight);
+	x = x < 0 ? 0 : x;
+	y = y < 0 ? 0 : y;
+	x = x > (mWidth - 1) ? (mWidth - 1) : x;
+	y = y > (mHeight - 1) ? (mHeight - 1) : y;
+	int pixel_data_start_index = 3 * (x + y * mWidth);
+	float r = float(mRGBPixel[pixel_data_start_index]) / 255.0f;
+	float g = float(mRGBPixel[pixel_data_start_index + 1]) / 255.0f;
+	float b = float(mRGBPixel[pixel_data_start_index + 2]) / 255.0f;
+	return Vector3(r, g, b);
+}
diff --git a/Texture.h b/Texture.h
new file mode 100644
index 0000000..4a07ad6
--- /dev/null
+++ b/Texture.h
@@ -0,0 +1,16 @@
+#pragma once
+#include "Vector3.h"
+class Texture2D {
+public:
+	virtual Vector3 Sample(float u, float v) = 0;
+};
+class TextureRGB : public Texture2D {
+public:
+	unsigned char* mImageFileContent;
+	unsigned char* mRGBPixel;
+	int mWidth, mHeight;
+	TextureRGB();
+	~TextureRGB();
+	void Set(const char* image_path);
+	Vector3 Sample(float u, float v);
+};
\ No newline at end of file
diff --git a/raytracing.vcxproj b/raytracing.vcxproj
index d8976d7..0a44122 100644
--- a/raytracing.vcxproj
+++ b/raytracing.vcxproj
@@ -76,6 +76,7 @@
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
       <ConformanceMode>true</ConformanceMode>
+      <AdditionalOptions>/D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -133,6 +134,7 @@
     <ClCompile Include="Ray.cpp" />
     <ClCompile Include="Scene.cpp" />
     <ClCompile Include="Sphere.cpp" />
+    <ClCompile Include="Texture.cpp" />
     <ClCompile Include="util.cpp" />
     <ClCompile Include="Vector3.cpp" />
   </ItemGroup>
@@ -143,6 +145,7 @@
     <ClInclude Include="Ray.h" />
     <ClInclude Include="Scene.h" />
     <ClInclude Include="Sphere.h" />
+    <ClInclude Include="Texture.h" />
     <ClInclude Include="util.h" />
     <ClInclude Include="Vector3.h" />
   </ItemGroup>
diff --git a/raytracing.vcxproj.filters b/raytracing.vcxproj.filters
index 5501549..5fb4662 100644
--- a/raytracing.vcxproj.filters
+++ b/raytracing.vcxproj.filters
@@ -42,6 +42,9 @@
     <ClCompile Include="Material.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="Texture.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Scene.h">
@@ -68,5 +71,8 @@
     <ClInclude Include="Material.h">
       <Filter>源文件</Filter>
     </ClInclude>
+    <ClInclude Include="Texture.h">
+      <Filter>源文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/util.cpp b/util.cpp
index 080927a..92e8583 100644
--- a/util.cpp
+++ b/util.cpp
@@ -1,4 +1,5 @@
 #include "util.h"
+#include<functional>
 static RenderableBuffer* sRenderableBuffer = nullptr;
 void InitRenderableBuffer(HDC dc, int width, int height)
 {
@@ -41,3 +42,39 @@ float srandf()
 {
 	return randf() * 2.0f - 1.0f;
 }
+
+unsigned char* LoadFileContent(const char* path, int& file_size) {
+	FILE* file = fopen(path, "rb");
+	if (file != nullptr) {
+		fseek(file, 0, SEEK_END);
+		file_size = ftell(file);
+		if (file_size > 0) {
+			rewind(file);
+			unsigned char* content = new unsigned char[file_size + 1];
+			fread(content, 1, file_size, file);
+			content[file_size] = 0;
+			fclose(file);
+			return content;
+		}
+		fclose(file);
+	}
+	return nullptr;
+}
+
+unsigned char* DecodeBMP(unsigned char* bmp_file_content, int& width, int& height) {
+	if (0x4D42 == *((unsigned short*)bmp_file_content)) {
+		int pixel_data_offset = *((int*)(bmp_file_content + 10));
+		width = *((int*)(bmp_file_content + 18));
+		height = *((int*)(bmp_file_content + 22));
+		unsigned char * pixel_data = bmp_file_content + pixel_data_offset;
+		//bgr->rgb
+		for (int i = 0; i < width * height; i++) {
+			int pixel_data_start_index = i * 3;
+			unsigned char r = pixel_data[pixel_data_start_index + 2];
+			pixel_data[pixel_data_start_index + 2] = pixel_data[pixel_data_start_index];
+			pixel_data[pixel_data_start_index] = r;
+		}
+		return pixel_data;
+	}
+	return nullptr;
+}
diff --git a/util.h b/util.h
index 177227d..3cd1324 100644
--- a/util.h
+++ b/util.h
@@ -15,6 +15,8 @@ struct RenderableBuffer {
 
 void InitRenderableBuffer(HDC dc, int width, int height);
 void SetColor(int x, int y, AByte r, AByte g, AByte b, AByte a);
+unsigned char* LoadFileContent(const char* path, int& filesize);
+unsigned char* DecodeBMP(unsigned char* bmp_file, int& width, int& height);
 void ASwapBuffers(HDC dc);
 float randf();
 float srandf();
\ No newline at end of file