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tga解晰增加翻转判断

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This commit is contained in:
hyzboy 2018-12-08 13:50:50 +08:00
parent 1918ec2949
commit 967c385d8b
2 changed files with 31 additions and 5 deletions
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28
example/DirectGLTexture/TGATexture.cpp
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@ -69,6 +69,7 @@ namespace hgl
uint videomemory_format;
uint source_format;
uint line_size=0;
if(header->image_type==2)
{
@ -76,17 +77,20 @@ namespace hgl
{
videomemory_format=GL_RGB8;
source_format=GL_BGR;
line_size=header->width*3;
}
else if(header->bit==32)
{
videomemory_format=GL_RGBA8;
source_format=GL_BGRA;
line_size=header->width*4;
}
}
else if(header->image_type==3&&header->bit==8)
{
videomemory_format=GL_R8;
source_format=GL_RED;
line_size=header->width;
}
else
{
@ -98,7 +102,29 @@ namespace hgl
glCreateTextures(GL_TEXTURE_2D,1,&tex_id);
glTextureStorage2D(tex_id,1,videomemory_format,header->width,header->height);
glTextureSubImage2D(tex_id,0,0,0,header->width,header->height,source_format,GL_UNSIGNED_BYTE,data+sizeof(TGAHeader));
TGAImageDesc img_desc;
img_desc.image_desc=header->image_desc;
if(img_desc.direction==1)
glTextureSubImage2D(tex_id,0,0,0,header->width,header->height,source_format,GL_UNSIGNED_BYTE,data+sizeof(TGAHeader));
else
{
char *new_img=new char[line_size*header->height];
char *sp=data+sizeof(TGAHeader)+line_size*(header->height-1);
char *tp=new_img;
for(int i=0;i<header->height;i++)
{
memcpy(tp,sp,line_size);
tp+=line_size;
sp-=line_size;
}
glTextureSubImage2D(tex_id,0,0,0,header->width,header->height,source_format,GL_UNSIGNED_BYTE,new_img);
delete[] new_img;
}
glTextureParameteri(tex_id,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTextureParameteri(tex_id,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

8
example/DirectGLTexture/main.cpp
View File

@ -74,10 +74,10 @@ VB2f *vb_vertex=nullptr;
VB2f *vb_texcoord=nullptr;
VertexArray *va=nullptr;
constexpr float vertex_data[]={ -0.5f, 0.5f,
-0.5f,-0.5f,
0.5f, 0.5f,
0.5f,-0.5f
constexpr float vertex_data[]={ -0.75f, 0.75f,
-0.75f,-0.75f,
0.75f, 0.75f,
0.75f,-0.75f
};
constexpr float texcoord_data[]={ 0,0,