gwin_gl3d.c

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/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.io/license.html
 */
 
/**
 * @file    src/gwin/gwin_gl3d.c
 * @brief   GWIN sub-system button code
 */
 
#include "../../gfx.h"
 
#if GFX_USE_GWIN && GWIN_NEED_GL3D
 
#if GDISP_PIXELFORMAT != GDISP_PIXELFORMAT_RGB565
    #error "GWIN: GL3D only support GDISP_PIXELFORMAT_RGB565 color format (TinyGL limitation)"
#endif
 
#include "gwin_class.h"
 
#include "../../3rdparty/tinygl-0.4-ugfx/src/zgl.h"
 
// Forward definitions
static void gl3dDestroy(GWindowObject *gh);
static void gl3dRedraw(GWindowObject *gh);
static int gl3dResizeGLViewport(GLContext *c, int *xsize_ptr, int *ysize_ptr);
 
static const gwinVMT gl3dVMT = {
        "GL3D",                 // The classname
        sizeof(GGL3DObject),    // The object size
        gl3dDestroy,            // The destroy routine
        gl3dRedraw,             // The redraw routine
        0,                      // The after-clear routine
};
 
static gBool    haveGLwindow = gFalse;
 
GHandle gwinGGL3DCreate(GDisplay *g, GGL3DObject *gl, const GWindowInit *pInit) {
    ZBuffer *   zb;
    GLContext * glcxt;
 
    // Only one GL3D window allowed at a time (TinyGL limitation)
    if (haveGLwindow)
        return 0;
 
    if (!(gl = (GGL3DObject *)_gwindowCreate(g, &gl->g, pInit, &gl3dVMT, 0)))
        return 0;
 
    // Must be a multiple of 4 bytes
    gl->g.width &= ~3;
    gl->g.height &= ~3;
 
    zb = ZB_open(gl->g.width, gl->g.height, ZB_MODE_5R6G5B, 0, NULL, NULL, NULL);
    if (!zb) {
        if ((gl->g.flags & GWIN_FLG_DYNAMIC))
            gfxFree(gl);
        return 0;
    }
 
    /* initialisation of the TinyGL interpreter */
    glInit(zb);
    gl->glcxt = glcxt = gl_get_context();
    glcxt->opaque = gl;
    glcxt->gl_resize_viewport = gl3dResizeGLViewport;
 
    /* set the viewport : we force a call to the viewport resize routine */
    glcxt->viewport.xsize=-1;
    glcxt->viewport.ysize=-1;
 
    glViewport(0, 0, gl->g.width, gl->g.height);
 
    haveGLwindow = gTrue;
    gwinSetVisible((GHandle)gl, pInit->show);
    return (GHandle)gl;
}
 
static void gl3dDestroy(GWindowObject *gh) {
    (void) gh;
    glClose();
    haveGLwindow = gFalse;
}
 
static void gl3dRedraw(GWindowObject *gh) {
    ZBuffer *   zb;
 
    zb = ((GGL3DObject *)gh)->glcxt->zb;
    gdispGBlitArea(gh->display, gh->x, gh->y, zb->xsize, zb->ysize, 0, 0, zb->linesize/sizeof(gColor), (const gPixel *)zb->pbuf);
}
 
static int gl3dResizeGLViewport(GLContext *c, int *xsize_ptr, int *ysize_ptr) {
    int     cx, cy;
 
    cx = *xsize_ptr;
    cy = *ysize_ptr;
 
    // We ensure that cx and cy are multiples of 4 for the zbuffer. TODO: find a better solution
    cx &= ~3;
    cy &= ~3;
 
    if (cx <= 0 || cy <= 0)
        return -1;
 
    *xsize_ptr = cx;
    *ysize_ptr = cy;
 
    // Resize the GWIN???
 
    // Resize the Z buffer
    ZB_resize(c->zb, NULL, cx, cy);
    return 0;
}
 
/**
 * TinyGL support routines
 */
 
#include <string.h>
 
#define NO_CLIBRARY
 
void tgl_warning(const char *format, ...)   { (void)format; }
void tgl_trace(const char *format, ...)     { (void)format; }
void tgl_fixme(const char *format, ...)     { (void)format; }
void gl_fatal_error(char *format, ...)      { gfxHalt(format); }
void gl_assert(int test)                    { if (!test) gfxHalt("TinyGL Assert"); }
 
void gl_free(void *p)                       { gfxFree(p); }
void *gl_malloc(int size)                   { return gfxAlloc(size); }
 
void *gl_zalloc(int size) {
    void    *p;
 
    p = gfxAlloc(size);
    if (p)
        memset(p, 0, size);
    return p;
}
 
 
/**
 * Pre-load TinyGL headers
 */
 
/**
 * TinyGL wrapper code
 */
 
#include "../../3rdparty/tinygl-0.4-ugfx/src/api.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/list.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/vertex.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/init.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/matrix.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/texture.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/misc.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/clear.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/light.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/clip.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/select.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/get.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/zbuffer.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/zline.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/zdither.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/ztriangle.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/zmath.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/image_util.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/arrays.c"
#include "../../3rdparty/tinygl-0.4-ugfx/src/specbuf.c"
 
#endif /* GFX_USE_GWIN && GWIN_NEED_GL3D */