From 26f05c6e3dcac9995345fb5a2b031be7e3ea79e9 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sat, 30 Oct 2021 22:59:42 +0800
Subject: *TextGenerator

---
 Runtime/Graphics/Texture.cpp | 118 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 117 insertions(+), 1 deletion(-)

(limited to 'Runtime/Graphics/Texture.cpp')

diff --git a/Runtime/Graphics/Texture.cpp b/Runtime/Graphics/Texture.cpp
index 6b682e9..f92c094 100644
--- a/Runtime/Graphics/Texture.cpp
+++ b/Runtime/Graphics/Texture.cpp
@@ -3,7 +3,6 @@
 
 using namespace LuaBind;
 
-
 Texture::Texture(TextureSetting setting, ImageData* imgData)
 	: NativeClass<Texture>()
 {
@@ -94,7 +93,124 @@ void Texture::Init(TextureSetting setting, ImageData* imgData)
 	);
 }
 
+Texture::Texture(TextureSetting setting, int w, int h)
+	: NativeClass<Texture>()
+{
+	m_KeepPixelData = false;
+
+	m_Width = w;
+	m_Height = h;
+	m_Type = setting.type;
+	m_Format = setting.format;
+	m_WrapMode = setting.wrapMode;
+	m_FilterMode = setting.filterMode;
+	m_KeepPixelData = setting.keepImageData;
+
+	glGenTextures(1, &m_GPUID);
+	glBindTexture(GL_TEXTURE_2D, m_GPUID);
+
+	CheckGLError(
+		glDeleteTextures(1, &m_GPUID);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		throw TextureException(error);
+	);
+
+	switch (m_WrapMode) {
+	case ETextureWrapMode::Clamp:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+		break;
+	case ETextureWrapMode::Repeat:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+		break;
+	case ETextureWrapMode::Mirror:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
+		break;
+	default:
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+		break;
+	}
+
+	CheckGLError(
+		glDeleteTextures(1, &m_GPUID);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		throw TextureException(error);
+	);
+
+	switch (m_FilterMode) {
+		case ETextureFilterMode::Linear:
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			break;
+		case ETextureFilterMode::Nearest:
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+			break;
+		default:
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			break;
+	}
+	GLenum internalFormat = GL_RGB;
+	if (m_Format == ETextureFormat::R8)
+	{
+		internalFormat = GL_RED;
+	}
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+	glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
+
+	CheckGLError(
+		glDeleteTextures(1, &m_GPUID);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		throw TextureException(error);
+	);
+}
+
 Texture::~Texture()
 {
     glDeleteTextures(1, &m_GPUID);
+}
+
+void Texture::UpdateSubImage(Internal::Rect rect, int format, int type, const void* data)
+{
+	glBindTexture(GL_TEXTURE_2D, m_GPUID);
+
+	CheckGLError(
+		glBindTexture(GL_TEXTURE_2D, 0);
+		throw TextureException(error);
+	);
+
+	GLenum fmt = GL_RED; 
+	switch (format)
+	{
+		case EPixelFormat::PixelFormat_BGR: fmt = GL_BGR; break;
+		case EPixelFormat::PixelFormat_BGRA:fmt = GL_BGRA; break;
+		case EPixelFormat::PixelFormat_R:  fmt = GL_RED; break;
+		case EPixelFormat::PixelFormat_RG: fmt = GL_RG; break;
+		case EPixelFormat::PixelFormat_RGB: fmt = GL_RGB; break;
+		case EPixelFormat::PixelFormat_RGBA: fmt = GL_RGBA; break;
+	}
+	GLenum t = GL_UNSIGNED_BYTE;
+	switch (type) 
+	{
+		case EPixelElementType::PixelType_UNSIGNED_BYTE: t = GL_UNSIGNED_BYTE; break;
+		case EPixelElementType::PixelType_UNSIGNED_INT: t = GL_UNSIGNED_INT; break;
+		case EPixelElementType::PixelType_BYTE: t = GL_BYTE; break;
+		case EPixelElementType::PixelType_INT: t = GL_INT; break;
+		case EPixelElementType::PixelType_FLOAT: t = GL_FLOAT; break;
+	}
+
+	glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x, rect.y, rect.width, rect.height, fmt, t, data);
+
+	CheckGLError(
+		glBindTexture(GL_TEXTURE_2D, 0);
+		throw TextureException(error);
+	);
+
+	glBindTexture(GL_TEXTURE_2D, 0);
 }
\ No newline at end of file
-- 
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