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move of SDLGL code from Utility to Image

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This commit is contained in:
James Turk 2003-10-13 21:48:12 +00:00
parent b8ad6a40e8
commit df8832e08b
4 changed files with 108 additions and 105 deletions
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27
include/ZE_Utility.h
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@ -14,7 +14,7 @@
Definition file for ZEngine Utilities which are used throughout the engine and can be used in
conjunction with ZEngine.
<br>$Id: ZE_Utility.h,v 1.8 2003/10/13 21:40:05 cozman Exp $<br>
<br>$Id: ZE_Utility.h,v 1.9 2003/10/13 21:48:12 cozman Exp $<br>
\author James Turk
**/
@ -51,31 +51,6 @@ std::string FormatStr(const char *fmtstr, ...);
**/
SDL_RWops* RWFromZip(std::string zipname, std::string filename);
/*!
\brief Rounds a number up to the nearest power of two.
Rounds a number up to the next highest power of two, used for OpenGL textures. (From testgl.c)
Used internally, generally shouldn't be called by users.
\param in Number to round up.
\return num rounded up to closest power of two.
\since 0.8.6
**/
int PowerOfTwo(int num);
/*!
\brief Converts an SDL_Surface to an OpenGL texture ID.
Given an SDL_Surface returns a texture ID representing the OpenGL
texture assigned to that surface. Also returns texture coordinates
via texcoord parameter. (From SDL_GL_LoadTexture in testgl.c)
Used internally, generally shouldn't be called by users.
\param surface SDL_Surface to assign an OpenGL ID, returns unmodified.
\param texcoord Should be an array of 4 GLfloat, assigned texture coordinates for OpenGL use.
\return OpenGL texture ID for SDL_Surface, 0 if an error occurs.
\since 0.8.6
**/
GLuint SurfaceToTexture(SDL_Surface *surface, GLfloat *texcoord);
/*!
\brief Properly free SDL_Surface.

27
include/ZE_ZImage.h
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@ -13,7 +13,7 @@
\brief Definition file for ZImage.
Definition file for ZImage, the ZImage class for ZEngine.
<br>$Id: ZE_ZImage.h,v 1.27 2003/09/24 01:49:52 cozman Exp $<br>
<br>$Id: ZE_ZImage.h,v 1.28 2003/10/13 21:48:13 cozman Exp $<br>
\author James Turk
**/
@ -55,6 +55,31 @@ class ZImage
GLfloat rWidth;
//! Current draw height of Texture.
GLfloat rHeight;
/*!
\brief Rounds a number up to the nearest power of two.
Rounds a number up to the next highest power of two, used for OpenGL textures. (From testgl.c)
Used internally, generally shouldn't be called by users.
\param in Number to round up.
\return num rounded up to closest power of two.
\since 0.8.6
**/
int PowerOfTwo(int num);
/*!
\brief Converts an SDL_Surface to an OpenGL texture ID.
Given an SDL_Surface returns a texture ID representing the OpenGL
texture assigned to that surface. Also returns texture coordinates
via texcoord parameter. (From SDL_GL_LoadTexture in testgl.c)
Used internally, generally shouldn't be called by users.
\param surface SDL_Surface to assign an OpenGL ID, returns unmodified.
\param texcoord Should be an array of 4 GLfloat, assigned texture coordinates for OpenGL use.
\return OpenGL texture ID for SDL_Surface, 0 if an error occurs.
\since 0.8.6
**/
GLuint SurfaceToTexture(SDL_Surface *surface, GLfloat *texcoord);
#endif //GFX_BACKEND == OGL
public:

78
src/ZE_Utility.cpp
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@ -13,7 +13,7 @@
\brief Source file for ZEngine utility functions.
Source file containing open utilities for use inside and alongside ZEngine.
<br>$Id: ZE_Utility.cpp,v 1.12 2003/10/13 21:40:05 cozman Exp $<br>
<br>$Id: ZE_Utility.cpp,v 1.13 2003/10/13 21:48:13 cozman Exp $<br>
\author James Turk
**/
@ -75,82 +75,6 @@ SDL_RWops* RWFromZip(std::string zipname, std::string filename)
return SDL_RWFromMem(buffer, info.uncompressed_size); //return buffer in RW form
}
//from SDL's testgl.c power_of_two
int PowerOfTwo(int num)
{
int value = 1;
while(value < num) //texture coord must be >= input
value <<= 1; //value <<= 1 is the same as value *= 2
return value;
}
//from SDL's testgl.c SDL_GL_LoadTexture
GLuint SurfaceToTexture(SDL_Surface *surface, GLfloat *texcoord)
{
GLuint texture;
int w, h;
SDL_Surface *temp;
SDL_Rect area;
Uint32 saved_flags;
Uint8 saved_alpha;
//expand width and height to nearest powers of 2
w = PowerOfTwo(surface->w);
h = PowerOfTwo(surface->h);
texcoord[0] = 0.0f; //min X
texcoord[1] = 0.0f; //min Y
texcoord[2] = (GLfloat)surface->w / w; //max X
texcoord[3] = (GLfloat)surface->h / h; //max Y
temp = SDL_CreateRGBSurface(
SDL_SWSURFACE,
w, h,
32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN //endian specific color masks
0x000000FF,
0x0000FF00,
0x00FF0000,
0xFF000000
#else
0xFF000000,
0x00FF0000,
0x0000FF00,
0x000000FF
#endif
);
if(!temp) //failure in CreateRGBSurface
return 0;
//save alpha
saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
saved_alpha = surface->format->alpha;
if((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, 0, 0);
//copy surface (do not alter passed surface to allow this function to be used in special situations)
area.x = 0;
area.y = 0;
area.w = static_cast<Sint16>(surface->w);
area.h = static_cast<Sint16>(surface->h);
SDL_BlitSurface(surface, &area, temp, &area);
//restore saved alpha
if((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, saved_flags, saved_alpha);
//create the OpenGL texture
glGenTextures(1, &texture);
//setup texture parmaters
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, temp->pixels);
SDL_FreeSurface(temp); //temp surface no longer needed
return texture;
}
//Each of the Free*s safely frees & NULLs the pointer
void FreeImage(SDL_Surface *&image)
{

81
src/ZE_ZImage.cpp
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@ -13,7 +13,7 @@
\brief Source file for ZImage.
Implementation of ZImage, the Image class for ZEngine.
<br>$Id: ZE_ZImage.cpp,v 1.49 2003/10/13 21:40:05 cozman Exp $<br>
<br>$Id: ZE_ZImage.cpp,v 1.50 2003/10/13 21:48:13 cozman Exp $<br>
\author James Turk
**/
@ -22,6 +22,85 @@
namespace ZE
{
#if (GFX_BACKEND == ZE_OGL)
//from SDL's testgl.c power_of_two
int ZImage::PowerOfTwo(int num)
{
int value = 1;
while(value < num) //texture coord must be >= input
value <<= 1; //value <<= 1 is the same as value *= 2
return value;
}
//from SDL's testgl.c SDL_GL_LoadTexture
GLuint ZImage::SurfaceToTexture(SDL_Surface *surface, GLfloat *texcoord)
{
GLuint texture;
int w, h;
SDL_Surface *temp;
SDL_Rect area;
Uint32 saved_flags;
Uint8 saved_alpha;
//expand width and height to nearest powers of 2
w = PowerOfTwo(surface->w);
h = PowerOfTwo(surface->h);
texcoord[0] = 0.0f; //min X
texcoord[1] = 0.0f; //min Y
texcoord[2] = (GLfloat)surface->w / w; //max X
texcoord[3] = (GLfloat)surface->h / h; //max Y
temp = SDL_CreateRGBSurface(
SDL_SWSURFACE,
w, h,
32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN //endian specific color masks
0x000000FF,
0x0000FF00,
0x00FF0000,
0xFF000000
#else
0xFF000000,
0x00FF0000,
0x0000FF00,
0x000000FF
#endif
);
if(!temp) //failure in CreateRGBSurface
return 0;
//save alpha
saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
saved_alpha = surface->format->alpha;
if((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, 0, 0);
//copy surface (do not alter passed surface to allow this function to be used in special situations)
area.x = 0;
area.y = 0;
area.w = static_cast<Sint16>(surface->w);
area.h = static_cast<Sint16>(surface->h);
SDL_BlitSurface(surface, &area, temp, &area);
//restore saved alpha
if((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, saved_flags, saved_alpha);
//create the OpenGL texture
glGenTextures(1, &texture);
//setup texture parmaters
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, temp->pixels);
SDL_FreeSurface(temp); //temp surface no longer needed
return texture;
}
#endif //GFX_BACKEND == ZE_OGL
ZImage::ZImage() :
rEngine(ZEngine::GetInstance()),
rImage(NULL),