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fs2open.github.com/code/graphics/gropengltexture.cpp
T
taylor bb99432d75 bits of cleanup 
minor fixes for -img2dds
2006-04-06 23:23:56 +00:00

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/*
* Copyright (C) Volition, Inc. 1999. All rights reserved.
*
* All source code herein is the property of Volition, Inc. You may not sell
* or otherwise commercially exploit the source or things you created based on the
* source.
*
*/
/*
* $Logfile: /Freespace2/code/Graphics/GrOpenGLTexture.cpp $
* $Revision: 1.46 $
* $Date: 2006-04-06 23:23:56 $
* $Author: taylor $
*
* source for texturing in OpenGL
*
* $Log: not supported by cvs2svn $
* Revision 1.45 2006/03/22 18:14:52 taylor
* if -mipmap is used with -img2dds to then have compressed image also contain mipmaps
* use nicest hints for texture compression, should improve quality a little
* when reporting compressed sizes to debug log make ani size be total, not per frame
*
* Revision 1.44 2006/03/15 17:33:05 taylor
* couple of nitpicks
*
* Revision 1.43 2006/03/12 07:34:39 taylor
* when I forget that I'm an idiot little things like this slip through (me == moron)
*
* Revision 1.42 2006/01/30 06:52:15 taylor
* better lighting for OpenGL
* remove some extra stuff that was from sectional bitmaps since we don't need it anymore
*
* Revision 1.41 2006/01/14 06:23:39 taylor
* be sure to account for skipped mipmap levels in calculation of textures in VRAM
*
* Revision 1.40 2006/01/12 17:42:56 wmcoolmon
* Even more scripting stuff.
*
* Revision 1.39 2006/01/03 22:46:52 taylor
* oops, should have been checking my logs on that one, fixes minor GL error
*
* Revision 1.38 2006/01/03 02:59:14 taylor
* fix a couple of minor mipmap problems
* add resizing with mipmaps rather than a physical change in memory when detail levels dictate scaling (maybe this won't blow up)
*
* Revision 1.37 2005/12/29 00:00:18 taylor
* handle case where we make an atexit (on failure) flush call before the texture system is initted
*
* Revision 1.36 2005/12/28 22:28:44 taylor
* add support for glCompressedTexSubImage2D(), we don't use it yet but there is nothing wrong with adding it already
* better support for mipmaps and mipmap filtering
* add reg option "TextureFilter" to set bilinear or trilinear filter
* clean up bitmap_id/bitmap_handle/texture_handle madness that made things difficult to understand
* small fix for using 24-bit images on 16-bit bpp visual (untested)
*
* Revision 1.35 2005/12/16 06:48:28 taylor
* "House Keeping!!"
* - minor cleanup of things that have bothered me at one time or another
* - slight speedup from state switching
* - slightly better specmap handling, fixes a couple of (not frequent) strange and sorta random issues
* - make sure to only disable HTL arb stuff when in HTL mode
* - handle any extra lighting pass before spec pass so the light can be applied properly
*
* Revision 1.34 2005/12/15 16:27:45 taylor
* make sure we always disable all VBO related elements to avoid crashing (new that was a problem, did it anyway, me == stupid)
*
* Revision 1.33 2005/12/08 15:10:07 taylor
* add APPLE_client_storage support to improve texture performance and reduce memory usage a tiny bit on OS X
*
* Revision 1.32 2005/12/07 12:40:51 taylor
* fix last bit of recent spec issue
*
* Revision 1.31 2005/12/06 02:50:41 taylor
* clean up some init stuff and fix a minor SDL annoyance
* make debug messages a bit more readable
* clean up the debug console commands for minimize and anisotropic filter setting
* make anisotropic filter actually work correctly and have it settable with a reg option
* give opengl_set_arb() the ability to disable all features on all arbs at once so I don't have to everywhere
*
* Revision 1.30 2005/11/16 07:45:35 taylor
* umm, no one saw that, right? :)
*
* Revision 1.29 2005/11/13 06:44:18 taylor
* small bit of EFF cleanup
* add -img2dds support
* cleanup some D3D stuff (missing a lot since the old code is so unstable I couldn't get it working like I wanted)
* some minor OGL cleanup and small performance changes
* converge the various pcx_read_bitmap* functions into one
* cleanup/rename/remove some cmdline options
*
* Revision 1.28 2005/10/23 20:34:30 taylor
* some cleanup, fix some general memory leaks, safety stuff and whatever else Valgrind complained about
*
* Revision 1.27 2005/10/23 19:07:18 taylor
* make AABITMAP use GL_ALPHA rather than GL_LUMINANCE_ALPHA (now 8-bit instead of 16-bit, fixes several minor rendering issues)
*
* Revision 1.26 2005/09/20 02:46:52 taylor
* slight speedup for font rendering
* fix a couple of things that Valgrind complained about
*
* Revision 1.25 2005/09/05 09:36:41 taylor
* merge of OSX tree
* fix OGL fullscreen switch for SDL since the old way only worked under Linux and not OSX or Windows
* fix OGL version check, it would allow a required major version to be higher if the required minor version was lower than current
*
* Revision 1.24 2005/06/19 02:37:02 taylor
* general cleanup, remove some old code
* speed up gr_opengl_flip() just a tad
* inverted gamma slider fix that Sticks made to D3D
* possible fix for ATI green screens
* move opengl_check_for_errors() out of gropentnl so we can use it everywhere
* fix logged OGL info from debug builds to be a little more readable
* if an extension is found but required function is not then fail
* try to optimize glDrawRangeElements so we are not rendering more than the card is optimized for
* some 2d matrix usage checks
*
* Revision 1.23 2005/06/03 06:44:17 taylor
* cleanup of gr_bitmap since it's the same for D3D and OGL, skip if GR_STUB though
* fix resize/rendering issue when detail culling is used with optimized opengl_create_texture_sub()
*
* Revision 1.22 2005/06/01 09:37:44 taylor
* little cleanup
* optimize opengl_create_texture_sub() by not doing any extra image processing if we don't have to
* if an image is already power-of-2 or we don't need power-of-2 then avoid the extra time and memory usage
*
* Revision 1.21 2005/05/12 17:42:13 taylor
* use vm_malloc(), vm_free(), vm_realloc(), vm_strdup() rather than system named macros
* fixes various problems and is past time to make the switch
* set byte_mult to 2 for TCACHE_TYPE_AABITMAP to get the memory size right for Debug builds
*
* Revision 1.20 2005/04/24 12:56:42 taylor
* really are too many changes here:
* - remove all bitmap section support and fix problems with previous attempt
* ( code/bmpman/bmpman.cpp, code/bmpman/bmpman.h, code/globalincs/pstypes.h,
* code/graphics/2d.cpp, code/graphics/2d.h code/graphics/grd3dbmpman.cpp,
* code/graphics/grd3dinternal.h, code/graphics/grd3drender.cpp, code/graphics/grd3dtexture.cpp,
* code/graphics/grinternal.h, code/graphics/gropengl.cpp, code/graphics/gropengl.h,
* code/graphics/gropengllight.cpp, code/graphics/gropengltexture.cpp, code/graphics/gropengltexture.h,
* code/graphics/tmapper.h, code/network/multi_pinfo.cpp, code/radar/radarorb.cpp
* code/render/3ddraw.cpp )
* - use CLAMP() define in gropengl.h for gropengllight instead of single clamp() function
* - remove some old/outdated code from gropengl.cpp and gropengltexture.cpp
*
* Revision 1.19 2005/04/23 01:17:09 wmcoolmon
* Removed GL_SECTIONS
*
* Revision 1.18 2005/04/21 15:50:47 taylor
* we can't resize compressed textures so... don't, fixes rendering problems when not at max texture detail
*
* Revision 1.17 2005/03/10 08:00:05 taylor
* change min/max to MIN/MAX to fix GCC problems
* add lab stuff to Makefile
* build unbreakage for everything that's not MSVC++ 6
* lots of warning fixes
* fix OpenGL rendering problem with ship insignias
* no Warnings() in non-debug mode for Linux (like Windows)
* some campaign savefile fixage to stop reverting everyones data
*
* Revision 1.16 2005/01/30 09:27:40 Goober5000
* nitpicked some boolean tests, and fixed two small bugs
* --Goober5000
*
* Revision 1.15 2005/01/21 08:54:53 taylor
* slightly better memory management
*
* Revision 1.14 2005/01/21 08:25:14 taylor
* fill in gr_opengl_set_texture_addressing()
* add support for non-power-of-two textures for cards that have it
* temporary crash fix from multiple mipmap levels in uncompressed formats
*
* Revision 1.13 2005/01/01 11:24:23 taylor
* good OpenGL spec mapping
* fix VBO crash with multitexture using same uv coord data
* little speedup of opengl_tcache_frame()
* error message to make sure hardware supports the minimum texture size
* move OpenGL version check out of the extention printout code
* disable 2d_poof with OpenGL
*
* Revision 1.12 2004/12/05 01:28:39 taylor
* support uncompressed DDS images
* use TexSubImage2D for video anis
*
* Revision 1.11 2004/12/02 11:14:29 taylor
* not used at the moment but that code was stupid
*
* Revision 1.10 2004/11/29 18:02:01 taylor
* make sure we are checking the right bitmap_id
*
* Revision 1.9 2004/10/31 21:46:10 taylor
* Linux tree merge, better DDS support, texture panning
*
* Revision 1.8 2004/09/05 19:23:24 Goober5000
* fixed a few warnings
* --Goober5000
*
* Revision 1.7 2004/07/26 20:47:32 Kazan
* remove MCD complete
*
* Revision 1.6 2004/07/21 00:03:46 taylor
* fix problem with sectioned menu bitmaps in OGL
*
* Revision 1.5 2004/07/17 18:49:57 taylor
* oops, I can't spell
*
* Revision 1.4 2004/07/17 18:43:46 taylor
* don't use bitmap sections by default, openil_close()
*
* Revision 1.3 2004/07/12 16:32:48 Kazan
* MCD - define _MCD_CHECK to use memory tracking
*
* Revision 1.2 2004/07/01 01:12:31 bobboau
* implemented index buffered background bitmaps,
* OGL people you realy should get this implemented
*
* Revision 1.1 2004/05/24 07:25:32 taylor
* filename case change
*
* Revision 2.5 2004/05/06 22:26:52 taylor
* fix DDS textures
*
* Revision 2.4 2004/04/26 12:43:58 taylor
* minor fixes, HTL lines, 32-bit texture support
*
* Revision 2.3 2004/04/13 01:55:41 phreak
* put in the correct fields for the CVS comments to register
* fixed a glowmap problem that occured when rendering glowmapped and non-glowmapped ships
*
*
* $NoKeywords: $
*/
#ifdef _WIN32
#include <windows.h>
#endif
#include "globalincs/pstypes.h"
#include "globalincs/systemvars.h"
#include "osapi/osregistry.h"
#include "bmpman/bmpman.h"
#include "cmdline/cmdline.h"
#include "graphics/gropengl.h"
#include "graphics/gropengltexture.h"
#include "graphics/gropenglextension.h"
#include "graphics/grinternal.h"
#include "ddsutils/ddsutils.h"
static tcache_slot_opengl *Textures = NULL;
ubyte Tex_used_this_frame[MAX_BITMAPS];
int GL_texture_ram = 0;
int GL_frame_count = 0;
int GL_min_texture_width = 0;
GLint GL_max_texture_width = 0;
int GL_min_texture_height = 0;
GLint GL_max_texture_height = 0;
int GL_square_textures = 0;
int GL_textures_in = 0;
int GL_textures_in_frame = 0;
int GL_last_bitmap_id = -1;
int GL_last_detail = -1;
int GL_last_bitmap_type = -1;
GLint GL_supported_texture_units = 2;
int GL_should_preload = 0;
ubyte GL_xlat[256] = { 0 };
GLfloat GL_anisotropy = 0.0f;
GLfloat GL_max_anisotropy = 0.0f;
static int vram_full = 0; // UnknownPlayer
int GL_mipmap_filter = 0;
extern int GLOWMAP;
extern int SPECMAP;
extern int CLOAKMAP;
extern int Interp_multitex_cloakmap;
//opengl supports 32 multitexture units
//we will too incase people are playing fs2_open in 2020
static int GL_texture_units_enabled[32]={0};
// forward declarations
int opengl_free_texture(tcache_slot_opengl *t);
void opengl_free_texture_with_handle(int handle);
void opengl_tcache_get_adjusted_texture_size(int w_in, int h_in, int *w_out, int *h_out);
int opengl_create_texture_sub(int bitmap_handle, int bitmap_type, int bmap_w, int bmap_h, int tex_w, int tex_h, ushort *data = NULL, tcache_slot_opengl *t = NULL, int base_level = 0, int resize = 0, int reload = 0, int fail_on_full = 0);
int opengl_create_texture (int bitmap_handle, int bitmap_type, tcache_slot_opengl *tslot = NULL, int fail_on_full = 0);
void opengl_set_additive_tex_env()
{
if (opengl_extension_is_enabled(GL_ARB_ENV_COMBINE))
{
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD);
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0f);
}
else if (opengl_extension_is_enabled(GL_EXT_ENV_COMBINE))
{
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_ADD);
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 1.0f);
}
else {
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
}
}
void opengl_set_modulate_tex_env()
{
if (opengl_extension_is_enabled(GL_ARB_ENV_COMBINE))
{
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE); // make sure
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 4.0f);
}
else if (opengl_extension_is_enabled(GL_EXT_ENV_COMBINE))
{
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_MODULATE);
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE); // make sure
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 4.0f);
}
else {
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
}
void gr_opengl_set_tex_env_scale(float scale)
{
if (GL_Extensions[GL_ARB_ENV_COMBINE].enabled)
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, scale);
else if (GL_Extensions[GL_EXT_ENV_COMBINE].enabled)
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, scale);
else
{}
}
GLfloat opengl_get_max_anisotropy()
{
if ( !opengl_extension_is_enabled(GL_TEX_FILTER_ANISO) )
return 0.0f;
if ( !GL_max_anisotropy ) {
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &GL_max_anisotropy);
}
return GL_max_anisotropy;
}
// setup anisotropic filtering if we can
void opengl_set_anisotropy(GLfloat aniso_value)
{
if ( !opengl_extension_is_enabled(GL_TEX_FILTER_ANISO) )
return;
if ( !GL_max_anisotropy ) {
opengl_get_max_anisotropy();
}
if ( !GL_anisotropy ) {
char *plevel;
plevel = os_config_read_string( NULL, NOX("OGL_AnisotropicFilter"), NOX("1.0") );
GL_anisotropy = (GLfloat)atof(plevel);
if ( GL_anisotropy < 1.0f ) {
GL_anisotropy = 1.0f;
} else if ( GL_anisotropy > GL_max_anisotropy ) {
GL_anisotropy = GL_max_anisotropy;
}
}
if ( (aniso_value >= 1.0f) && (aniso_value <= GL_max_anisotropy) ) {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, aniso_value);
GL_anisotropy = aniso_value;
} else {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, GL_anisotropy);
}
}
void opengl_switch_arb(int unit, int state)
{
if (unit >= GL_supported_texture_units)
return;
if ( unit < 0 ) {
// support a mass disable on all arbs so we don't have to make each call ourselves
if ( !state ) {
for ( int i = 0; i < GL_supported_texture_units; i++ ) {
// only turn off 2D if the arb was previously enabled (fixes a specmap problem)
if (GL_texture_units_enabled[i]) {
glActiveTextureARB(GL_TEXTURE0_ARB + i);
glDisable(GL_TEXTURE_2D);
}
if ( !Cmdline_nohtl ) {
// the rest of this is always turned off regardless of whether or not the arb
// was previously enabled or not
glClientActiveTextureARB(GL_TEXTURE0_ARB + i);
glDisableClientState( GL_VERTEX_ARRAY );
glDisableClientState( GL_NORMAL_ARRAY );
glDisableClientState( GL_TEXTURE_COORD_ARRAY );
if (VBO_ENABLED) {
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
}
}
GL_texture_units_enabled[i] = 0;
}
}
return;
}
if (state) {
if (GL_texture_units_enabled[unit])
return;
glActiveTextureARB(GL_TEXTURE0_ARB + unit);
glEnable(GL_TEXTURE_2D);
GL_texture_units_enabled[unit] = 1;
} else {
if (!GL_texture_units_enabled[unit])
return;
glActiveTextureARB(GL_TEXTURE0_ARB + unit);
glDisable(GL_TEXTURE_2D);
GL_texture_units_enabled[unit] = 0;
}
}
void opengl_tcache_init()
{
int i;
// DDOI - FIXME skipped a lot of stuff here
GL_should_preload = 0;
//uint tmp_pl = os_config_read_uint( NULL, NOX("D3DPreloadTextures"), 255 );
uint tmp_pl = 1;
if ( tmp_pl == 0 ) {
GL_should_preload = 0;
} else if ( tmp_pl == 1 ) {
GL_should_preload = 1;
} else {
GL_should_preload = 1;
}
GL_min_texture_width = 16;
GL_min_texture_height = 16;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
GL_max_texture_height = GL_max_texture_width;
// if we are not using sections then make sure we have the min texture size available to us
// 1024 is what we need with the standard resolutions - taylor
if (GL_max_texture_width < 1024)
Error(LOCATION, "A minimum texture size of \"1024x1024\" is required for FS2_Open but only \"%ix%i\" was found. Can not continue.", GL_max_texture_width, GL_max_texture_height);
GL_square_textures = 0;
if ( Textures == NULL ) {
Textures = (tcache_slot_opengl *)vm_malloc(MAX_BITMAPS*sizeof(tcache_slot_opengl));
}
if ( !Textures ) {
Error(LOCATION, "Unable to allocate memory for OpenGL texture slots!");
}
memset( Textures, 0, MAX_BITMAPS * sizeof(tcache_slot_opengl) );
memset( Tex_used_this_frame, 0, MAX_BITMAPS * sizeof(ubyte) );
// Init the texture structures
for( i=0; i<MAX_BITMAPS; i++ ) {
Textures[i].bitmap_handle = -1;
}
// check what mipmap filter we should be using
// 0 == Bilinear
// 1 == Trilinear
GL_mipmap_filter = os_config_read_uint(NULL, "TextureFilter", 0);
if (GL_mipmap_filter > 1)
GL_mipmap_filter = 1;
//GL_last_detail = Detail.hardware_textures;
GL_last_bitmap_id = -1;
GL_last_bitmap_type = -1;
GL_textures_in = 0;
GL_textures_in_frame = 0;
}
int opengl_free_texture (tcache_slot_opengl *t);
void opengl_free_texture_with_handle(int handle)
{
int n = bm_get_cache_slot(handle, 1);
Tex_used_this_frame[n] = 0;
opengl_free_texture( &Textures[n] );
}
void opengl_tcache_flush ()
{
int i;
if ( Textures == NULL )
return;
for( i=0; i<MAX_BITMAPS; i++ ) {
opengl_free_texture( &Textures[i] );
}
if (GL_textures_in != 0) {
mprintf(( "WARNING: VRAM is at %d instead of zero after flushing!\n", GL_textures_in ));
GL_textures_in = 0;
}
GL_last_bitmap_id = -1;
}
void opengl_tcache_cleanup ()
{
opengl_tcache_flush ();
GL_textures_in = 0;
GL_textures_in_frame = 0;
if ( Textures ) {
vm_free(Textures);
Textures = NULL;
}
}
void opengl_tcache_frame ()
{
GL_last_bitmap_id = -1;
GL_textures_in_frame = 0;
GL_frame_count++;
// make all textures as not used
memset( Tex_used_this_frame, 0, MAX_BITMAPS * sizeof(ubyte) );
if ( vram_full ) {
opengl_tcache_flush();
vram_full = 0;
}
}
void opengl_free_texture_slot( int n )
{
Tex_used_this_frame[n] = 0;
opengl_free_texture( &Textures[n] );
}
int opengl_free_texture ( tcache_slot_opengl *t )
{
// Bitmap changed!!
if ( t->bitmap_handle > -1 ) {
// if I, or any of my children have been used this frame, bail
// can't use bm_get_cache_slot() here since bitmap_id probably isn't valid
if ( Tex_used_this_frame[t->bitmap_handle % MAX_BITMAPS] ) {
return 0;
}
// ok, now we know its legal to free everything safely
glDeleteTextures (1, &t->texture_id);
// t->texture_id = 0;
if ( GL_last_bitmap_id == t->bitmap_handle ) {
GL_last_bitmap_id = -1;
}
GL_textures_in -= t->size;
memset( t, 0, sizeof(tcache_slot_opengl) );
t->bitmap_handle = -1;
// t->bpp = 0;
}
return 1;
}
void opengl_tcache_get_adjusted_texture_size(int w_in, int h_in, int *w_out, int *h_out)
{
int i, tex_w, tex_h;
// bogus
if((w_out == NULL) || (h_out == NULL)){
return;
}
// if we can support non-power-of-2 textures then just return current sizes - taylor
if ( opengl_extension_is_enabled(GL_ARB_TEXTURE_NON_POWER_OF_TWO) ) {
*w_out = w_in;
*h_out = h_in;
return;
}
// starting size
tex_w = w_in;
tex_h = h_in;
for (i=0; i<16; i++ ) {
if ( (tex_w > (1<<i)) && (tex_w <= (1<<(i+1))) ) {
tex_w = 1 << (i+1);
break;
}
}
for (i=0; i<16; i++ ) {
if ( (tex_h > (1<<i)) && (tex_h <= (1<<(i+1))) ) {
tex_h = 1 << (i+1);
break;
}
}
if ( tex_w < GL_min_texture_width ) {
tex_w = GL_min_texture_width;
} else if ( tex_w > GL_max_texture_width ) {
tex_w = GL_max_texture_width;
}
if ( tex_h < GL_min_texture_height ) {
tex_h = GL_min_texture_height;
} else if ( tex_h > GL_max_texture_height ) {
tex_h = GL_max_texture_height;
}
if ( GL_square_textures ) {
int new_size;
// Make the both be equal to larger of the two
new_size = MAX(tex_w, tex_h);
tex_w = new_size;
tex_h = new_size;
}
// store the outgoing size
*w_out = tex_w;
*h_out = tex_h;
}
// data == start of bitmap data
// bmap_w == width of source bitmap
// bmap_h == height of source bitmap
// tex_w == width of final texture
// tex_h == height of final texture
int opengl_create_texture_sub(int bitmap_handle, int bitmap_type, int bmap_w, int bmap_h, int tex_w, int tex_h, ushort *data, tcache_slot_opengl *t, int base_level, int resize, int reload, int fail_on_full)
{
int ret_val = 1;
int byte_mult = 0;
GLenum texFormat = GL_UNSIGNED_SHORT_1_5_5_5_REV;
GLenum glFormat = GL_BGRA;
GLint intFormat = GL_RGBA;
ubyte saved_bpp = 0;
int mipmap_w = 0, mipmap_h = 0;
int dsize = 0, doffset = 0, block_size = 0;
int i,j,k;
ubyte *bmp_data = ((ubyte*)data);
ubyte *texmem = NULL, *texmemp;
int skip_size = 0, mipmap_levels = 0;
// bogus
if ( (t == NULL) || (bmp_data == NULL) ) {
return 0;
}
int idx = bm_get_cache_slot( bitmap_handle, 1 );
if ( Tex_used_this_frame[idx] ) {
mprintf(( "ARGHH!!! Texture already used this frame! Cannot free it!\n" ));
return 0;
}
if ( !reload ) {
// save the bpp since it will get reset - fixes anis being 0 bpp
saved_bpp = t->bpp;
// gah
if(!opengl_free_texture(t)){
return 0;
}
}
// for everything that might use mipmaps
mipmap_w = tex_w;
mipmap_h = tex_h;
if ( (bitmap_type == TCACHE_TYPE_AABITMAP) || (bitmap_type == TCACHE_TYPE_INTERFACE) ) {
t->u_scale = (float)bmap_w / (float)tex_w;
t->v_scale = (float)bmap_h / (float)tex_h;
} else {
t->u_scale = 1.0f;
t->v_scale = 1.0f;
}
if (!reload) {
glGenTextures (1, &t->texture_id);
}
if (t->texture_id == 0) {
mprintf(("!!OpenGL DEBUG!! t->texture_id == 0"));
return 0;
}
if (t->bpp == 0) {
// it got reset, revert to saved setting
t->bpp = saved_bpp;
}
// set the byte per pixel multiplier
byte_mult = (t->bpp >> 3);
// GL_BGRA_EXT is *much* faster with some hardware/drivers
if (byte_mult == 4) {
texFormat = GL_UNSIGNED_INT_8_8_8_8_REV;
intFormat = (gr_screen.bits_per_pixel == 32) ? GL_RGBA8 : GL_RGB5_A1;
glFormat = GL_BGRA;
} else if (byte_mult == 3) {
texFormat = GL_UNSIGNED_BYTE;
intFormat = (gr_screen.bits_per_pixel == 32) ? GL_RGB8 : GL_RGB5;
glFormat = GL_BGR;
} else if (byte_mult == 2) {
texFormat = GL_UNSIGNED_SHORT_1_5_5_5_REV;
intFormat = GL_RGB5_A1;
glFormat = GL_BGRA;
} else if (byte_mult == 1) {
Assert( bitmap_type == TCACHE_TYPE_AABITMAP );
texFormat = GL_UNSIGNED_BYTE;
intFormat = GL_ALPHA;
glFormat = GL_ALPHA;
} else {
texFormat = GL_UNSIGNED_SHORT_1_5_5_5_REV;
intFormat = GL_RGBA;
glFormat = GL_BGRA;
}
// check for compressed image types
switch (bm_is_compressed(bitmap_handle)) {
case DDS_DXT1:
intFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
block_size = 8;
break;
case DDS_DXT3:
intFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
block_size = 16;
break;
case DDS_DXT5:
intFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
block_size = 16;
break;
}
glBindTexture (GL_TEXTURE_2D, t->texture_id);
#ifdef __APPLE__
if ( opengl_extension_is_enabled(GL_APPLE_CLIENT_STORAGE) && !resize && (byte_mult != 1)) {
glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, 1);
}
#endif
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
mipmap_levels = bm_get_num_mipmaps(bitmap_handle);
if ( (mipmap_levels > 1) && (base_level+1 < mipmap_levels) ) {
// bifilter = GL_LINEAR_MIPMAP_NEAREST
// trifilter = GL_LINEAR_MIPMAP_LINEAR
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GL_mipmap_filter) ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR_MIPMAP_NEAREST);
}
switch (bitmap_type)
{
case TCACHE_TYPE_COMPRESSED:
{
if (block_size > 0) {
// size of data block (4x4)
dsize = ((mipmap_h + 3) / 4) * ((mipmap_w + 3) / 4) * block_size;
// if we are skipping mipmap levels in order to resize then we have to calc the new offset
for (i = 0; i < base_level; i++) {
doffset += dsize;
mipmap_w /= 2;
mipmap_h /= 2;
if (mipmap_w <= 0)
mipmap_w = 1;
if (mipmap_h <= 0)
mipmap_h = 1;
dsize = ((mipmap_h + 3) / 4) * ((mipmap_w + 3) / 4) * block_size;
}
skip_size = doffset;
if (!reload)
glCompressedTexImage2D(GL_TEXTURE_2D, 0, intFormat, mipmap_w, mipmap_h, 0, dsize, bmp_data + doffset);
else
glCompressedTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, mipmap_w, mipmap_h, intFormat, dsize, bmp_data + doffset);
// now that the base image is done handle any mipmap levels
for (i = 1; i < (mipmap_levels - base_level); i++) {
// adjust the data offset for the next block
doffset += dsize;
// reduce size by half for the next pass
mipmap_w /= 2;
mipmap_h /= 2;
if (mipmap_w <= 0)
mipmap_w = 1;
if (mipmap_h <= 0)
mipmap_h = 1;
// size of data block (4x4)
dsize = ((mipmap_h + 3) / 4) * ((mipmap_w + 3) / 4) * block_size;
if (!reload)
glCompressedTexImage2D(GL_TEXTURE_2D, i, intFormat, mipmap_w, mipmap_h, 0, dsize, bmp_data + doffset);
else
glCompressedTexSubImage2D(GL_TEXTURE_2D, i, 0, 0, mipmap_w, mipmap_h, intFormat, dsize, bmp_data + doffset);
}
} else {
Int3();
return 0;
}
break;
}
case TCACHE_TYPE_AABITMAP:
{
texmem = (ubyte *) vm_malloc (tex_w*tex_h*byte_mult);
texmemp = texmem;
Assert( texmem != NULL );
for (i=0;i<tex_h;i++)
{
for (j=0;j<tex_w;j++)
{
if (i < bmap_h && j < bmap_w) {
*texmemp++ = GL_xlat[bmp_data[i*bmap_w+j]];
} else {
*texmemp++ = 0;
}
}
}
if (!reload)
glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA, tex_w, tex_h, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texmem);
else // faster anis
glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, tex_w, tex_h, GL_ALPHA, GL_UNSIGNED_BYTE, texmem);
if (texmem != NULL)
vm_free (texmem);
break;
}
case TCACHE_TYPE_INTERFACE:
{
// if we aren't resizing then we can just use bmp_data directly
if ( resize ) {
texmem = (ubyte *) vm_malloc (tex_w*tex_h*byte_mult);
texmemp = texmem;
Assert( texmem != NULL );
for (i=0;i<tex_h;i++)
{
for (j=0;j<tex_w;j++)
{
if (i < bmap_h && j < bmap_w) {
for (k = 0; k < byte_mult; k++) {
*texmemp++ = bmp_data[(i*bmap_w+j)*byte_mult+k];
}
} else {
for (k = 0; k < byte_mult; k++) {
*texmemp++ = 0;
}
}
}
}
}
if (!reload)
glTexImage2D (GL_TEXTURE_2D, 0, intFormat, mipmap_w, mipmap_h, 0, glFormat, texFormat, (resize) ? texmem : bmp_data);
else // faster anis
glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, mipmap_w, mipmap_h, glFormat, texFormat, (resize) ? texmem : bmp_data);
if (texmem != NULL)
vm_free(texmem);
break;
}
default:
{
// if we aren't resizing then we can just use bmp_data directly
if ( resize ) {
texmem = (ubyte *) vm_malloc (tex_w*tex_h*byte_mult);
texmemp = texmem;
Assert( texmem != NULL );
fix u, utmp, v, du, dv;
u = v = 0;
du = ( (bmap_w-1)*F1_0 ) / tex_w;
dv = ( (bmap_h-1)*F1_0 ) / tex_h;
for (j=0;j<tex_h;j++)
{
utmp = u;
for (i=0;i<tex_w;i++)
{
for (k = 0; k < byte_mult; k++) {
*texmemp++ = bmp_data[(f2i(v)*bmap_w+f2i(utmp))*byte_mult+k];
}
utmp += du;
}
v += dv;
}
}
// should never have mipmap levels if we also have to manually resize
if ( (mipmap_levels > 1) && resize )
Assert( texmem == NULL );
dsize = mipmap_h * mipmap_w * byte_mult;
// if we are skipping mipmap levels in order to resize then we have to calc the new offset
for (i = 0; i < base_level; i++) {
doffset += dsize;
mipmap_w /= 2;
mipmap_h /= 2;
if (mipmap_w <= 0)
mipmap_w = 1;
if (mipmap_h <= 0)
mipmap_h = 1;
dsize = mipmap_h * mipmap_w * byte_mult;
}
skip_size = doffset;
if (!reload)
glTexImage2D (GL_TEXTURE_2D, 0, intFormat, mipmap_w, mipmap_h, 0, glFormat, texFormat, (texmem != NULL) ? texmem : bmp_data + doffset);
else // faster anis
glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, mipmap_w, mipmap_h, glFormat, texFormat, (texmem != NULL) ? texmem : bmp_data + doffset);
// base image is done so now take care of any mipmap levels
for (i = 1; i < (mipmap_levels - base_level); i++) {
doffset += dsize;
mipmap_w /= 2;
mipmap_h /= 2;
if (mipmap_w <= 0)
mipmap_w = 1;
if (mipmap_h <= 0)
mipmap_h = 1;
dsize = mipmap_h * mipmap_w * byte_mult;
if (!reload)
glTexImage2D (GL_TEXTURE_2D, i, intFormat, mipmap_w, mipmap_h, 0, glFormat, texFormat, bmp_data + doffset);
else
glTexSubImage2D (GL_TEXTURE_2D, i, 0, 0, mipmap_w, mipmap_h, glFormat, texFormat, bmp_data + doffset);
}
if (texmem != NULL)
vm_free(texmem);
break;
}
}//end switch
t->bitmap_handle = bitmap_handle;
t->time_created = GL_frame_count;
Tex_used_this_frame[idx] = 0;
t->size = (dsize) ? ((doffset + dsize) - skip_size) : (tex_w * tex_h * byte_mult);
t->w = (ushort)tex_w;
t->h = (ushort)tex_h;
GL_textures_in_frame += t->size;
if (!reload) {
GL_textures_in += t->size;
}
#ifdef __APPLE__
if ( opengl_extension_is_enabled(GL_APPLE_CLIENT_STORAGE) && !resize && (byte_mult != 1)) {
glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, 0);
}
#endif
return ret_val;
}
int opengl_create_texture (int bitmap_handle, int bitmap_type, tcache_slot_opengl *tslot, int fail_on_full)
{
ubyte flags;
bitmap *bmp;
int final_w, final_h;
ubyte bpp = 16;
int reload = 0, resize = 0, base_level = 0;
int max_levels = 0;
if (tslot == NULL) {
return 0;
}
// setup texture/bitmap flags
flags = 0;
switch(bitmap_type){
case TCACHE_TYPE_AABITMAP:
flags |= BMP_AABITMAP;
bpp = 8;
break;
case TCACHE_TYPE_NORMAL:
flags |= BMP_TEX_OTHER;
break;
case TCACHE_TYPE_INTERFACE:
case TCACHE_TYPE_XPARENT:
flags |= BMP_TEX_XPARENT;
break;
case TCACHE_TYPE_NONDARKENING:
Int3();
flags |= BMP_TEX_NONDARK;
break;
case TCACHE_TYPE_COMPRESSED:
switch (bm_is_compressed(bitmap_handle)) {
case DDS_DXT1: //dxt1
bpp = 24;
flags |= BMP_TEX_DXT1;
break;
case DDS_DXT3: //dxt3
bpp = 32;
flags |= BMP_TEX_DXT3;
break;
case DDS_DXT5: //dxt5
bpp = 32;
flags |= BMP_TEX_DXT5;
break;
default:
Assert( 0 );
break;
}
break;
}
// lock the bitmap into the proper format
bmp = bm_lock(bitmap_handle, bpp, flags);
if ( bmp == NULL ) {
mprintf(("Couldn't lock bitmap %d.\n", bitmap_handle ));
return 0;
}
int max_w = bmp->w;
int max_h = bmp->h;
max_levels = bm_get_num_mipmaps(bitmap_handle);
// if we ended up locking a texture that wasn't originally compressed then this should catch it
if ( bm_is_compressed(bitmap_handle) ) {
bitmap_type = TCACHE_TYPE_COMPRESSED;
}
// DDOI - TODO
if ( (Detail.hardware_textures < 4) && (bitmap_type != TCACHE_TYPE_AABITMAP) && (bitmap_type != TCACHE_TYPE_INTERFACE)
&& ((bitmap_type == TCACHE_TYPE_COMPRESSED) && (max_levels > 1)) )
{
if (max_levels == 1) {
// if we are going to cull the size then we need to force a resize
// Detail.debris_culling goes from 0 to 4.
max_w /= (16 >> Detail.hardware_textures);
max_h /= (16 >> Detail.hardware_textures);
resize = 1;
} else {
// we have mipmap levels so use those as a resize point (image should already be power-of-2)
base_level = -(Detail.hardware_textures - 4);
Assert(base_level >= 0);
if ( base_level >= max_levels ) {
base_level = max_levels - 1;
}
Assert( (max_levels - base_level) >= 1 );
}
}
// get final texture size
opengl_tcache_get_adjusted_texture_size(max_w, max_h, &final_w, &final_h);
// only resize if we actually need a new size, better data use and speed out of opengl_create_texture_sub()
if ( (max_w != final_w) || (max_h != final_h) ) {
resize = 1;
// little safety check for later, we can't manually resize AND use mipmap resizing
Assert( !base_level );
}
if ( (final_h < 1) || (final_w < 1) ) {
mprintf(("Bitmap is to small at %dx%d.\n", final_w, final_h ));
return 0;
}
// if this tcache slot has no bitmap
if ( tslot->bitmap_handle < 0) {
reload = 0;
}
// different bitmap altogether - determine if the new one can use the old one's slot
else if (tslot->bitmap_handle != bitmap_handle) {
if((final_w == tslot->w) && (final_h == tslot->h)){
reload = 1;
//ml_printf("Reloading texture %d\n", bitmap_handle);
} else {
reload = 0;
}
}
// set the bits per pixel
tslot->bpp = bmp->bpp;
// max number of mipmap levels (NOTE: this is the max number used by the API, not how many true mipmap levels there are in the image!!)
tslot->mipmap_levels = (ubyte)(max_levels - base_level);
// call the helper
int ret_val = opengl_create_texture_sub(bitmap_handle, bitmap_type, bmp->w, bmp->h, final_w, final_h, (ushort*)bmp->data, tslot, base_level, resize, reload, fail_on_full);
// unlock the bitmap
bm_unlock(bitmap_handle);
return ret_val;
}
int gr_opengl_tcache_set_internal(int bitmap_handle, int bitmap_type, float *u_scale, float *v_scale, int fail_on_full = 0, int force = 0, int tex_unit = 0)
{
int ret_val = 1;
if ( GL_last_detail != Detail.hardware_textures ) {
GL_last_detail = Detail.hardware_textures;
opengl_tcache_flush();
}
if (vram_full) {
return 0;
}
int n = bm_get_cache_slot (bitmap_handle, 1);
tcache_slot_opengl *t = &Textures[n];
if ( (GL_last_bitmap_id == bitmap_handle) && (GL_last_bitmap_type == bitmap_type) && (t->bitmap_handle == bitmap_handle) ) {
Tex_used_this_frame[n]++;
*u_scale = t->u_scale;
*v_scale = t->v_scale;
return 1;
}
glActiveTextureARB(GL_TEXTURE0_ARB+tex_unit);
opengl_set_anisotropy();
if ((t->bitmap_handle < 0) || (bitmap_handle != t->bitmap_handle)) {
ret_val = opengl_create_texture( bitmap_handle, bitmap_type, t, fail_on_full );
}
// everything went ok
if (ret_val && t->texture_id && !vram_full) {
*u_scale = t->u_scale;
*v_scale = t->v_scale;
glBindTexture (GL_TEXTURE_2D, t->texture_id );
// OGL expects mipmap levels all the way down to 1x1 but I think this will avoid white texture
// issues when we have fewer levels than that, it caps the total number of levels available with 0 as min value
if ( t->mipmap_levels > 1 ) {
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, t->mipmap_levels - 1);
// also set the filter type again, just to make sure it's correct
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GL_mipmap_filter) ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR_MIPMAP_NEAREST);
}
GL_last_bitmap_id = t->bitmap_handle;
GL_last_bitmap_type = bitmap_type;
Tex_used_this_frame[n]++;
}
// gah
else {
glBindTexture (GL_TEXTURE_2D, 0); // test - DDOI
return 0;
}
return 1;
}
int gr_opengl_tcache_set(int bitmap_handle, int bitmap_type, float *u_scale, float *v_scale, int fail_on_full, int force, int stage)
{
if (bitmap_handle < 0)
{
GL_last_bitmap_id = -1;
return 0;
}
// set compressed type if it's so, needed to be right later
if (bm_is_compressed(bitmap_handle) > 0) {
bitmap_type = TCACHE_TYPE_COMPRESSED;
}
//make sure textuing is on
opengl_switch_arb(stage, 1);
return gr_opengl_tcache_set_internal(bitmap_handle, bitmap_type, u_scale, v_scale, fail_on_full, force, stage);
}
void gr_opengl_preload_init()
{
if (gr_screen.mode != GR_OPENGL) {
return;
}
opengl_tcache_flush ();
}
int gr_opengl_preload(int bitmap_num, int is_aabitmap)
{
if ( gr_screen.mode != GR_OPENGL) {
return 0;
}
if ( !GL_should_preload ) {
return 0;
}
float u_scale, v_scale;
int retval;
if ( is_aabitmap ) {
retval = gr_tcache_set(bitmap_num, TCACHE_TYPE_AABITMAP, &u_scale, &v_scale, 1 );
} else {
retval = gr_tcache_set(bitmap_num, TCACHE_TYPE_NORMAL, &u_scale, &v_scale, 1 );
}
if ( !retval ) {
mprintf(("Texture upload failed!\n" ));
}
return retval;
}
static int GL_texture_panning_enabled = 0;
void gr_opengl_set_texture_panning(float u, float v, bool enable)
{
if (Cmdline_nohtl)
return;
GLint current_matrix;
if (enable) {
glGetIntegerv(GL_MATRIX_MODE, &current_matrix);
glMatrixMode( GL_TEXTURE );
glPushMatrix();
glTranslatef( u, v, 0.0f );
glMatrixMode(current_matrix);
GL_texture_panning_enabled = 1;
} else if (GL_texture_panning_enabled) {
glGetIntegerv(GL_MATRIX_MODE, &current_matrix);
glMatrixMode( GL_TEXTURE );
glPopMatrix();
glMatrixMode(current_matrix);
GL_texture_panning_enabled = 0;
}
}
void gr_opengl_set_texture_addressing(int mode)
{
if (mode == TMAP_ADDRESS_WRAP) {
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
} else if (mode == TMAP_ADDRESS_MIRROR) {
if (opengl_extension_is_enabled(GL_ARB_TEXTURE_MIRRORED_REPEAT)) {
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT_ARB);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT_ARB);
} else {
// just use a standard repeat if the mirror extension isn't supported
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
}
} else if (mode == TMAP_ADDRESS_CLAMP) {
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
}
}
int opengl_compress_image( ubyte **compressed_data, ubyte *in_data, int width, int height, int alpha, int num_mipmaps )
{
Assert( in_data != NULL );
if ( !Texture_compression_available )
return 0;
GLuint tex;
GLint compressed = GL_FALSE;
GLint compressed_size = 0;
ubyte *out_data = NULL;
GLint testing = 0;
GLint intFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
GLenum texFormat = GL_UNSIGNED_BYTE;
GLenum glFormat = GL_BGR;
int i;
if (alpha) {
intFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
texFormat = GL_UNSIGNED_INT_8_8_8_8_REV;
glFormat = GL_BGRA;
}
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
// a quick proxy test. this will tell us if it's possible without wasting a lot of time and resources in the attempt
glTexImage2D(GL_PROXY_TEXTURE_2D, 0, intFormat, width, height, 0, glFormat, texFormat, in_data);
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB, &compressed);
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &testing);
if ( (compressed == GL_FALSE) || (testing == 0) ) {
glDeleteTextures(1, &tex);
return 0;
}
// if mipmaps are requested then make them with the nicest possible settings
if (num_mipmaps > 1) {
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
glHint(GL_GENERATE_MIPMAP_HINT_SGIS, GL_NICEST);
}
// use best compression quality
glHint(GL_TEXTURE_COMPRESSION_HINT, GL_NICEST);
// alright, it should work if we are still here, now do it for real
glTexImage2D(GL_TEXTURE_2D, 0, intFormat, width, height, 0, glFormat, texFormat, in_data);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB, &compressed);
// if we got this far then it should have worked, but check anyway
Assert( compressed != GL_FALSE );
// for each mipmap level we generate go ahead and figure up the total memory required
for (i = 0; i < num_mipmaps; i++) {
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &testing);
compressed_size += testing;
}
out_data = (ubyte*)vm_malloc(compressed_size * sizeof(ubyte));
Assert( out_data != NULL );
memset(out_data, 0, compressed_size * sizeof(ubyte));
// reset compressed_size and go back through each mipmap level to get both size and the image data itself
compressed_size = 0;
for (i = 0; i < num_mipmaps; i++) {
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &testing);
glGetCompressedTexImageARB(GL_TEXTURE_2D, i, out_data + compressed_size);
compressed_size += testing;
}
// done with everything so reset hints to default values
if (num_mipmaps > 1) {
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
glHint(GL_GENERATE_MIPMAP_HINT, GL_DONT_CARE);
}
glHint(GL_TEXTURE_COMPRESSION_HINT, GL_DONT_CARE);
glBindTexture(GL_TEXTURE_2D, 0);
glDeleteTextures(1, &tex);
// send the data back out
*compressed_data = out_data;
return compressed_size;
}
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