Porting to GLES from GL - Revision history

M-HT at 10:53, 28 July 2013

2013-07-28T10:53:43Z

← Older revision		Revision as of 10:53, 28 July 2013
Line 89:		Line 89:
	At the end of this process you'll end up with a broken pandora binary. Let's now fix it :D		At the end of this process you'll end up with a broken pandora binary. Let's now fix it :D
	== Adding the EGL context ==		== Adding the EGL context ==
	Grab the eglport package Pickle has built [http://sourceforge.net/p/eglport/code-0/ here]. You will need to add a call to its 4 functions in the sources (make sure, also, that eglport.c is built and linked in the build process). Here is how your sources should look at the end :		Grab the eglport package Pickle has built [http://sourceforge.net/p/eglport/code-0/ here]. You will need to add a call to its 3 functions in the sources (make sure, also, that eglport.c is built and linked in the build process). Here is how your sources should look at the end :
	<source lang=c>		<source lang=c>
	#if !defined(HAVE_GLES)		#if !defined(HAVE_GLES)
Line 105:		Line 105:

	SDL_Init( SDL_INIT_VIDEO );		SDL_Init( SDL_INIT_VIDEO );
	~~#if defined(HAVE_GLES)~~
	~~if (EGL_Open())~~
	~~exit(1);~~
	~~#endif~~

	// some more initialisations		// some more initialisations
Line 117:		Line 113:
	#else		#else
	screen = SDL_SetVideoMode( 800, 480, 0, SDL_SWSURFACE \| SDL_FULLSCREEN );		screen = SDL_SetVideoMode( 800, 480, 0, SDL_SWSURFACE \| SDL_FULLSCREEN );
	~~EGL_Init~~();		if (EGL_Open( 800, 480 ))
			exit(1);
	#endif		#endif

Line 144:		Line 141:

	Please note that :		Please note that :
	* EGL_Open has to be called just after the SDL initialization of the VIDEO layer
	* SDL_SetVideoMode arguments have to be those given here (aka good resolution, and no SDL_OPENGL flag)		* SDL_SetVideoMode arguments have to be those given here (aka good resolution, and no SDL_OPENGL flag)
	* ~~EGL_Init~~ goes just after SDL_SetVideoMode		* EGL_Open goes just after SDL_SetVideoMode, the parameters are the same resolution used in SDL_SetVideoMode
	* '''All''' SDL_GL_SwapBuffers calls have to be converted to EGL_SwapBuffers calls.		* '''All''' SDL_GL_SwapBuffers calls have to be converted to EGL_SwapBuffers calls.
	* EGL_Close is called before quitting SDL (or closing the video if that's separated in your original source).		* EGL_Close is called before quitting SDL (or closing the video if that's separated in your original source).
	When built, your source should run on the Pandora cleanly (ok, you'll have a black screen, but that's expected as we haven't converted the drawing yet).		When built, your source should run on the Pandora cleanly (ok, you'll have a black screen, but that's expected as we haven't converted the drawing yet).

	''In addition to these instructions, I had to add "#include <X11/Xlib.h>" and change all the comments from line to block in eglport.c --lunixbochs"		''In addition to these instructions, I had to add "#include <X11/Xlib.h>" and change all the comments from line to block in eglport.c --lunixbochs
			* ''That was in old version (of eglport), you shouldn't need it it new version --M-HT

	== Converting the easy stuff ==		== Converting the easy stuff ==

M-HT at 10:42, 28 July 2013

2013-07-28T10:42:28Z

← Older revision		Revision as of 10:42, 28 July 2013
Line 53:		Line 53:
	search glX		search glX
	search glRect		search glRect
			search glNewList
	}		}

Line 88:		Line 89:
	At the end of this process you'll end up with a broken pandora binary. Let's now fix it :D		At the end of this process you'll end up with a broken pandora binary. Let's now fix it :D
	== Adding the EGL context ==		== Adding the EGL context ==
	Grab the eglport package Pickle has built [http://sourceforge.net/p/eglport/code-0~~/3/tree/trunk~~/ here]. You will need to add a call to its 4 functions in the sources (make sure, also, that eglport.c is built and linked in the build process). Here is how your sources should look at the end :		Grab the eglport package Pickle has built [http://sourceforge.net/p/eglport/code-0/ here]. You will need to add a call to its 4 functions in the sources (make sure, also, that eglport.c is built and linked in the build process). Here is how your sources should look at the end :
	<source lang=c>		<source lang=c>
	#if !defined(HAVE_GLES)		#if !defined(HAVE_GLES)

Lunixbochs: /* Foreword */

2013-03-24T06:46:35Z

Foreword

← Older revision		Revision as of 06:46, 24 March 2013
Line 2:		Line 2:
	This guide is based on my limited knowledge (I do have barely the requierement) on the subject. I'm open to get edits on it, in fact it is encouraged :)		This guide is based on my limited knowledge (I do have barely the requierement) on the subject. I'm open to get edits on it, in fact it is encouraged :)
	--[[User:Sebt3\|Sebt3]] 17:05, 24 February 2011 (MET)		--[[User:Sebt3\|Sebt3]] 17:05, 24 February 2011 (MET)

			You might want to try [http://boards.openpandora.org/index.php/topic/11506-opengl-implementation-tldr-more-games/page-1 libGL] before following the instructions on this page.

	== Requirements ==		== Requirements ==
	* a working toolchain		* a working toolchain

Sebt3: /* Converting the easy stuff */

2012-06-16T22:40:07Z

Converting the easy stuff

← Older revision		Revision as of 22:40, 16 June 2012
Line 161:		Line 161:
	#define glClearDepth glClearDepthf		#define glClearDepth glClearDepthf
	#define glOrtho glOrthof		#define glOrtho glOrthof
			#define glFrustum glFrustumf

	=== Colors ===		=== Colors ===

Sebt3: /* Before starting */

2012-05-03T04:13:04Z

Before starting

← Older revision		Revision as of 04:13, 3 May 2012
Line 26:		Line 26:
	<source lang=bash>		<source lang=bash>
	#!/bin/sh		#!/bin/sh

	search() {		search() {
	find . -name ".h" -o -name ".c" -o -name ".cpp" -exec grep -Hn "$" {} \;		find . $ -name ".h" -o -name ".c" -o -name ".cpp" -o -name ".cxx" $ -exec grep -Hn "$*" {} \;
	}		}

	listIssues() {		listIssues() {
	search SDL_WM_GrabInput		search SDL_WM_GrabInput
Line 48:		Line 48:
	search glTexImage2D		search glTexImage2D
	search glBegin		search glBegin
			search glX
			search glRect
	}		}

			listIssues\|sort -u

	~~listIssues\|sort -u~~
	</source>		</source>
	Run that from the source directory. The fewer lines displayed, the better.		Run that from the source directory. The fewer lines displayed, the better.

Sebt3: /* Known issues */

2012-05-03T04:11:02Z

Known issues

← Older revision		Revision as of 04:11, 3 May 2012
Line 376:		Line 376:

	== Known issues ==		== Known issues ==
	* glPushAttrib, glPopAttrib and their client versions don't exist. You'll have to manage these states yourself. Another good way is to have all disabled at all times and only enable what is needed at the right time.		* glPushAttrib, glPopAttrib and their client versions don't exist. You'll have to manage these states yourself. Another good way is to have all disabled at all times and only enable what is needed at the right time. and see racer sources (http://sebt3.openpandora.org/src/?f=racer-pandora-src.tar.bz2) to get a partial implementation
	* SDL_WM_GrabInput and SDL_WarpMouse might cause soft freeze of your game. If it does, #ifndef PANDORA them :)		* SDL_WM_GrabInput and SDL_WarpMouse might cause soft freeze of your game. If it does, #ifndef PANDORA them :)

Sebt3: /* Converting the immediate mode */

2012-05-03T04:08:32Z

Converting the immediate mode

@@ Line 269: / Line 269: @@
 #endif
 </source>
 Note that the last argument of glDrawArrays is the number of points. In these examples, that's always 4 because these all have 4 points. You might want to change that if your object has more (or less) than these 4 points.

Sebt3: /* Converting the easy stuff */

2012-05-03T04:03:55Z

Converting the easy stuff

← Older revision		Revision as of 04:03, 3 May 2012
Line 158:		Line 158:
	#define glClearDepth glClearDepthf		#define glClearDepth glClearDepthf
	#define glOrtho glOrthof		#define glOrtho glOrthof

			=== Colors ===
			GLES only knows glColor4f as the function to create a color; all the glColor3f, glColor3d, glColor4d or any other color conventions have to be converted to glColor4f. If you only have 3 arguments, the last have to be 1.0f (as no transparency).

	#define glColor4fv(a) glColor4f(a[0], a[1], a[2], a[3])		#define glColor4fv(a) glColor4f(a[0], a[1], a[2], a[3])
	#define glColor3fv(a) glColor4f(a[0], a[1], a[2], 1.0f)		#define glColor3fv(a) glColor4f(a[0], a[1], a[2], 1.0f)
	#define glColor3f(a,b,c) glColor4f(a, b, c, 1.0f)		#define glColor3f(a,b,c) glColor4f(a, b, c, 1.0f)

	~~=== Colors ===~~
	GLES only knows glColor4f as the function to create a color; all the glColor3f, glColor3d, glColor4d or any other color conventions have to be converted to glColor4f. If you only have 3 arguments, the last have to be 1.0f (as no transparency).

	== Converting the immediate mode ==		== Converting the immediate mode ==

Sebt3: /* Colors */

2012-05-03T04:02:48Z

Colors

← Older revision		Revision as of 04:02, 3 May 2012
Line 164:		Line 164:
	=== Colors ===		=== Colors ===
	GLES only knows glColor4f as the function to create a color; all the glColor3f, glColor3d, glColor4d or any other color conventions have to be converted to glColor4f. If you only have 3 arguments, the last have to be 1.0f (as no transparency).		GLES only knows glColor4f as the function to create a color; all the glColor3f, glColor3d, glColor4d or any other color conventions have to be converted to glColor4f. If you only have 3 arguments, the last have to be 1.0f (as no transparency).

	~~glColor3fv(a) should be replaced with glColor4f(a[0],a[1],a[2], 1.0f)~~

	== Converting the immediate mode ==		== Converting the immediate mode ==

Sebt3: /* Converting the easy stuff */

2012-05-03T04:02:32Z

Converting the easy stuff

← Older revision		Revision as of 04:02, 3 May 2012
Line 158:		Line 158:
	#define glClearDepth glClearDepthf		#define glClearDepth glClearDepthf
	#define glOrtho glOrthof		#define glOrtho glOrthof
			#define glColor4fv(a) glColor4f(a[0], a[1], a[2], a[3])
			#define glColor3fv(a) glColor4f(a[0], a[1], a[2], 1.0f)
			#define glColor3f(a,b,c) glColor4f(a, b, c, 1.0f)

	=== Colors ===		=== Colors ===