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#include <asura-utils/exceptions/exception.h>
#include "../core_config.h"
#include "image.h"
#include "gl.h"
using namespace AEIO;
namespace AsuraEngine
{
namespace Graphics
{
Image::Image()
: mVBO(nullptr)
, mWidth(0)
, mHeight(0)
{
}
Image::~Image()
{
if (mVBO)
delete mVBO;
}
bool Image::Load(ImageData* imgData)
{
if (!imgData) return false;
if (mTex == 0)
{
glGenTextures(1, &mTex);
if (mTex == 0)
throw Exception("OpenGL glGenTextures failed.");
}
glBindTexture(GL_TEXTURE_2D, mTex);
imgData->Lock();
int width = imgData->width;
int height = imgData->height;
TextureFormat tf = ConvertColorFormat(imgData->format);
glTexImage2D(
GL_TEXTURE_2D
, 0
, tf.internalformat
, width, height
, 0
, tf.externalformat
, tf.type
, imgData->pixels
);
// ʼbuffer
if (!mVBO)
mVBO = new GPUBuffer(BUFFER_TYPE_VERTEX, BUFFER_USAGE_STATIC, 16*sizeof(float)); // positionuv
if (mWidth != imgData->width || mHeight != imgData->height)
{
float w = imgData->width,
h = imgData->height;
float buffer[] = {
0, 0, 0, 0,
0, h, 0, 1,
w, h, 1, 1,
w, 0, 1, 0
};
mVBO->Fill(buffer, sizeof(buffer));
}
mWidth = imgData->width;
mHeight = imgData->height;
imgData->Unlock();
GLenum err = glGetError();
if (err != GL_NO_ERROR)
throw Exception("OpenGL glTexImage2D cause error, error code=%d", err);
glBindTexture(GL_TEXTURE_2D, 0);
return true;
}
bool Image::Load(ImageData* imgData, const AEMath::Vector2i& pos)
{
if (!imgData) return false;
glBindTexture(GL_TEXTURE_2D, mTex);
imgData->Lock();
int width = imgData->width;
int height = imgData->height;
TextureFormat tf = ConvertColorFormat(imgData->format);
glTexSubImage2D(
GL_TEXTURE_2D
, 0
, pos.x
, pos.y
, imgData->width
, imgData->height
, tf.externalformat
, tf.type
, imgData->pixels
);
imgData->Unlock();
GLenum err = glGetError();
if (err != GL_NO_ERROR)
throw Exception("OpenGL glTexSubImage2D cause error, error code=%d", err);
glBindTexture(GL_TEXTURE_2D, 0);
return true;
}
uint32 Image::GetWidth()
{
return mWidth;
}
uint32 Image::GetHeight()
{
return mHeight;
}
void Image::UpdateBuffer()
{
if (!mVBO)
return;
float w = mWidth,
h = mHeight;
float buffer[] = {
0, 0, 0, 0,
0, h, 0, 1,
w, h, 1, 1,
w, 0, 1, 0
};
mVBO->Fill(buffer, sizeof(buffer));
}
}
}
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