pixelflinger.cpp

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            (param == GGL_LINEAR_MIPMAP_NEAREST) ||
            (param == GGL_LINEAR_MIPMAP_LINEAR)) {
            what = &c->activeTMU->min_filter;
            param = GGL_LINEAR;
        }
        break;
    case GGL_TEXTURE_MAG_FILTER:
        if ((param == GGL_NEAREST) ||
            (param == GGL_LINEAR)) {
            what = &c->activeTMU->mag_filter;
        }
        break;
    }
    
    if (!what) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    
    if (*what != param) {
        *what = param;
        ggl_state_changed(c, GGL_TMU_STATE);
    }
}

static void ggl_texCoordGradScale8xv(void* con, GGLint tmu, const int32_t* grad)
{
    GGL_CONTEXT(c, con);
    texture_t& u = c->state.texture[tmu];
	u.shade.is0   = grad[0];
	u.shade.idsdx = grad[1];
	u.shade.idsdy = grad[2];
	u.shade.it0   = grad[3];
	u.shade.idtdx = grad[4];
	u.shade.idtdy = grad[5];
    u.shade.sscale= grad[6];
    u.shade.tscale= grad[7];
}

static void ggl_texCoord2x(void* con, GGLfixed s, GGLfixed t)
{
    GGL_CONTEXT(c, con);
	c->activeTMU->shade.is0 = s;
	c->activeTMU->shade.it0 = t;
    c->activeTMU->shade.sscale= 0;
    c->activeTMU->shade.tscale= 0;
}

static void ggl_texCoord2i(void* con, GGLint s, GGLint t)
{
    ggl_texCoord2x(con, s<<16, t<<16);
}

static void ggl_texGeni(void* con, GGLenum coord, GGLenum pname, GGLint param)
{
    GGL_CONTEXT(c, con);
    if (pname != GGL_TEXTURE_GEN_MODE) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }

    uint32_t* coord_ptr = 0;
    if (coord == GGL_S)         coord_ptr = &(c->activeTMU->s_coord);
    else if (coord == GGL_T)    coord_ptr = &(c->activeTMU->t_coord);

    if (coord_ptr) {
        if (*coord_ptr != uint32_t(param)) {
            *coord_ptr = uint32_t(param);
            ggl_state_changed(c, GGL_TMU_STATE);
        }
    } else {
        ggl_error(c, GGL_INVALID_ENUM);
    }
}

static void ggl_activeTexture(void* con, GGLuint tmu)
{
    GGL_CONTEXT(c, con);
    if (tmu >= GGLuint(GGL_TEXTURE_UNIT_COUNT)) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    c->activeTMUIndex = tmu;
    c->activeTMU = &(c->state.texture[tmu]);
}

// ----------------------------------------------------------------------------

static void ggl_colorMask(void* con, GGLboolean r,
                                     GGLboolean g,
                                     GGLboolean b,
                                     GGLboolean a)
{
    GGL_CONTEXT(c, con);
    int mask = 0;
    if (a)  mask |= 1 << GGLFormat::ALPHA;
    if (r)  mask |= 1 << GGLFormat::RED;
    if (g)  mask |= 1 << GGLFormat::GREEN;
    if (b)  mask |= 1 << GGLFormat::BLUE;
    if (c->state.mask.color != mask) {
        c->state.mask.color = mask;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

static void ggl_depthMask(void* con, GGLboolean flag)
{
    GGL_CONTEXT(c, con);
    if (c->state.mask.depth != flag?1:0) {
        c->state.mask.depth = flag?1:0;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

static void ggl_stencilMask(void* con, GGLuint mask)
{
    GGL_CONTEXT(c, con);
    if (c->state.mask.stencil != mask) {
        c->state.mask.stencil = mask;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

// ----------------------------------------------------------------------------

static void ggl_alphaFuncx(void* con, GGLenum func, GGLclampx ref)
{
    GGL_CONTEXT(c, con);
    if ((func < GGL_NEVER) || (func > GGL_ALWAYS)) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    c->state.alpha_test.ref = gglFixedToIteratedColor(gglClampx(ref));
    if (c->state.alpha_test.func != func) {
        c->state.alpha_test.func = func;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

// ----------------------------------------------------------------------------

static void ggl_depthFunc(void* con, GGLenum func)
{
    GGL_CONTEXT(c, con);
    if ((func < GGL_NEVER) || (func > GGL_ALWAYS)) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    if (c->state.depth_test.func != func) {
        c->state.depth_test.func = func;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

// ----------------------------------------------------------------------------

static void ggl_logicOp(void* con, GGLenum opcode)
{
    GGL_CONTEXT(c, con);
    if ((opcode < GGL_CLEAR) || (opcode > GGL_SET)) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    if (c->state.logic_op.opcode != opcode) {
        c->state.logic_op.opcode = opcode;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}


// ----------------------------------------------------------------------------

void ggl_set_scissor(context_t* c)
{
    if (c->state.enables & GGL_ENABLE_SCISSOR_TEST) {
        const int32_t l = c->state.scissor.user_left;
        const int32_t t = c->state.scissor.user_top;
        const int32_t r = c->state.scissor.user_right;
        const int32_t b = c->state.scissor.user_bottom;
        c->state.scissor.left   = max(0, l);
        c->state.scissor.right  = min(c->state.buffers.color.width, r);
        c->state.scissor.top    = max(0, t);
        c->state.scissor.bottom = min(c->state.buffers.color.height, b);
    } else {
        c->state.scissor.left   = 0;
        c->state.scissor.top    = 0;
        c->state.scissor.right  = c->state.buffers.color.width;
        c->state.scissor.bottom = c->state.buffers.color.height;
    }
}

void ggl_enable_blending(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_BLENDING)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_BLENDING;
        else        c->state.enables &= ~GGL_ENABLE_BLENDING;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_scissor_test(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_SCISSOR_TEST)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_SCISSOR_TEST;
        else        c->state.enables &= ~GGL_ENABLE_SCISSOR_TEST;
        ggl_set_scissor(c);
    }
}

void ggl_enable_alpha_test(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_ALPHA_TEST)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_ALPHA_TEST;
        else        c->state.enables &= ~GGL_ENABLE_ALPHA_TEST;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_logic_op(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_LOGIC_OP)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_LOGIC_OP;
        else        c->state.enables &= ~GGL_ENABLE_LOGIC_OP;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_dither(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_DITHER)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_DITHER;
        else        c->state.enables &= ~GGL_ENABLE_DITHER;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_stencil_test(context_t* c, int enable)
{
}

void ggl_enable_depth_test(context_t* c, int enable)
{
    if (c->state.buffers.depth.format == 0)
        enable = 0;
    const int e = (c->state.enables & GGL_ENABLE_DEPTH_TEST)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_DEPTH_TEST;
        else        c->state.enables &= ~GGL_ENABLE_DEPTH_TEST;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_aa(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_AA)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_AA;
        else        c->state.enables &= ~GGL_ENABLE_AA;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_point_aa_nice(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_POINT_AA_NICE)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_POINT_AA_NICE;
        else        c->state.enables &= ~GGL_ENABLE_POINT_AA_NICE;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_w_lerp(context_t* c, int enable)
{
    const int e = (c->state.enables & GGL_ENABLE_W)?1:0;
    if (e != enable) {
        if (enable) c->state.enables |= GGL_ENABLE_W;
        else        c->state.enables &= ~GGL_ENABLE_W;
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

void ggl_enable_texture2d(context_t* c, int enable)
{
    if (c->activeTMU->enable != enable) {
        const uint32_t tmu = c->activeTMUIndex;
        c->activeTMU->enable = enable;
        const uint32_t mask = 1UL << tmu;
        if (enable)                 c->state.enabled_tmu |= mask;
        else                        c->state.enabled_tmu &= ~mask;
        if (c->state.enabled_tmu)   c->state.enables |= GGL_ENABLE_TMUS;
        else                        c->state.enables &= ~GGL_ENABLE_TMUS;
        ggl_state_changed(c, GGL_TMU_STATE);
    }
}

        
// ----------------------------------------------------------------------------

int64_t ggl_system_time()
{
#if defined(HAVE_POSIX_CLOCKS)
    struct timespec t;
    t.tv_sec = t.tv_nsec = 0;
    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &t);
    return int64_t(t.tv_sec)*1000000000LL + t.tv_nsec;
#else
    // we don't support the clocks here.
    struct timeval t;
    t.tv_sec = t.tv_usec = 0;
    gettimeofday(&t, NULL);
    return int64_t(t.tv_sec)*1000000000LL + int64_t(t.tv_usec)*1000LL;
#endif
}

// ----------------------------------------------------------------------------

void ggl_init_procs(context_t* c)
{
    GGLContext& procs = *(GGLContext*)c;
    GGL_INIT_PROC(procs, scissor);
    GGL_INIT_PROC(procs, activeTexture);
    GGL_INIT_PROC(procs, bindTexture);
    GGL_INIT_PROC(procs, bindTextureLod);
    GGL_INIT_PROC(procs, colorBuffer);
    GGL_INIT_PROC(procs, readBuffer);
    GGL_INIT_PROC(procs, depthBuffer);
    GGL_INIT_PROC(procs, enable);
    GGL_INIT_PROC(procs, disable);
    GGL_INIT_PROC(procs, enableDisable);
    GGL_INIT_PROC(procs, shadeModel);
    GGL_INIT_PROC(procs, color4xv);
    GGL_INIT_PROC(procs, colorGrad12xv);
    GGL_INIT_PROC(procs, zGrad3xv);
    GGL_INIT_PROC(procs, wGrad3xv);
    GGL_INIT_PROC(procs, fogGrad3xv);
    GGL_INIT_PROC(procs, fogColor3xv);
    GGL_INIT_PROC(procs, blendFunc);
    GGL_INIT_PROC(procs, blendFuncSeparate);
    GGL_INIT_PROC(procs, texEnvi);
    GGL_INIT_PROC(procs, texEnvxv);
    GGL_INIT_PROC(procs, texParameteri);
    GGL_INIT_PROC(procs, texCoord2i);
    GGL_INIT_PROC(procs, texCoord2x);
    GGL_INIT_PROC(procs, texCoordGradScale8xv);
    GGL_INIT_PROC(procs, texGeni);
    GGL_INIT_PROC(procs, colorMask);
    GGL_INIT_PROC(procs, depthMask);
    GGL_INIT_PROC(procs, stencilMask);
    GGL_INIT_PROC(procs, alphaFuncx);
    GGL_INIT_PROC(procs, depthFunc);
    GGL_INIT_PROC(procs, logicOp);
    ggl_init_clear(c);
}

void ggl_init_context(context_t* c)
{
    memset(c, 0, sizeof(context_t));
    ggl_init_procs(c);
    ggl_init_trap(c);
    ggl_init_scanline(c);
    ggl_init_texture(c);
    ggl_init_picker(c);
    ggl_init_raster(c);
    c->formats = gglGetPixelFormatTable();
    c->state.blend.src = GGL_ONE;
    c->state.blend.dst = GGL_ZERO;
    c->state.blend.src_alpha = GGL_ONE;
    c->state.blend.dst_alpha = GGL_ZERO;
    c->state.mask.color = 0xF;
    c->state.mask.depth = 0;
    c->state.mask.stencil = 0xFFFFFFFF;
    c->state.logic_op.opcode = GGL_COPY;
    c->state.alpha_test.func = GGL_ALWAYS;
    c->state.depth_test.func = GGL_LESS;
    c->state.depth_test.clearValue = FIXED_ONE;
    c->shade.w0 = FIXED_ONE;
    memcpy(c->ditherMatrix, gDitherMatrix, sizeof(gDitherMatrix));
}

void ggl_uninit_context(context_t* c)
{
    ggl_uninit_scanline(c);
}

// ----------------------------------------------------------------------------
}; // namespace android
// ----------------------------------------------------------------------------



using namespace android;

ssize_t gglInit(GGLContext** context)
{
    void* const base = malloc(sizeof(context_t) + 32);
	if (base) {
        // always align the context on cache lines
        context_t *c = (context_t *)((ptrdiff_t(base)+31) & ~0x1FL);
        ggl_init_context(c);
        c->base = base;
		*context = (GGLContext*)c;
	} else {
		return -1;
	}
	return 0;
}

ssize_t gglUninit(GGLContext* con)
{
    GGL_CONTEXT(c, (void*)con);
    ggl_uninit_context(c);
	free(c->base);
	return 0;
}