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SDLGL code move

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This commit is contained in:
James Turk 2003-10-13 21:40:05 +00:00
parent 2d2b88b4a6
commit 15178a25fa
4 changed files with 108 additions and 8 deletions
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3
include/ZE_Includes.h
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@ -14,7 +14,7 @@
ZE_*.h files should only include this file and any other ZE_*.h files that they need, External Library or C/C++ Standard Library
files should be included from within this file.
$Id: ZE_Includes.h,v 1.19 2003/10/13 20:59:30 cozman Exp $<br>
$Id: ZE_Includes.h,v 1.20 2003/10/13 21:40:05 cozman Exp $<br>
\author James Turk
**/
@ -26,7 +26,6 @@
#include "SDL.h"
#if (GFX_BACKEND == ZE_OGL)
#include "SDL_opengl.h"
#include "external/SDLGL_Util.h"
#endif
#ifdef USE_SDL_IMAGE
#include "SDL_image.h"

31
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 1.7 2003/10/05 19:42:34 cozman Exp $<br>
<br>$Id: ZE_Utility.h,v 1.8 2003/10/13 21:40:05 cozman Exp $<br>
\author James Turk
**/
@ -42,8 +42,8 @@ std::string FormatStr(const char *fmtstr, ...);
\brief Extracts a SDL_RWops memory structure from a zip archive.
Attempts to open a file from within a zipfile and return a SDL_RWops which can be used
to load a resource from memory. Used by 'LoadFromZip' members of ZImage/ZSound/ZFont
so generally not called.
to load a resource from memory.
Used internally, generally shouldn't be called by users.
\param zipname Name of zip-format archive to open.
\param filename Name of file within archive to access.
\return On success, pointer to SDL_RWops, on failure, NULL.
@ -51,6 +51,31 @@ 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.

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 1.11 2003/09/24 02:03:18 cozman Exp $<br>
<br>$Id: ZE_Utility.cpp,v 1.12 2003/10/13 21:40:05 cozman Exp $<br>
\author James Turk
**/
@ -75,6 +75,82 @@ 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)
{

4
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 1.48 2003/10/11 16:21:50 cozman Exp $<br>
<br>$Id: ZE_ZImage.cpp,v 1.49 2003/10/13 21:40:05 cozman Exp $<br>
\author James Turk
**/
@ -172,7 +172,7 @@ void ZImage::Attach(SDL_Surface *surface)
rWidth = static_cast<float>(surface->w);
rHeight = static_cast<float>(surface->h);
rTexID = SDL_GL_LoadTexture(surface,coord); //major helper, not written by me, from libsdl.org
rTexID = SurfaceToTexture(surface,coord);
rTexMinX = coord[0];
rTexMinY = coord[1];
rTexMaxX = coord[2];