pixelflinger.cpp

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/* libs/pixelflinger/pixelflinger.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/


#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <sys/time.h>

#include <pixelflinger/pixelflinger.h>
#include <private/pixelflinger/ggl_context.h>

#include "buffer.h"
#include "clear.h"
#include "picker.h"
#include "raster.h"
#include "scanline.h"
#include "trap.h"

#include "codeflinger/GGLAssembler.h"
#include "codeflinger/CodeCache.h"

#include <stdio.h> 


namespace android {

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

// 8x8 Bayer dither matrix
static const uint8_t gDitherMatrix[GGL_DITHER_SIZE] = {
     0, 32,  8, 40,  2, 34, 10, 42,
    48, 16, 56, 24, 50, 18, 58, 26,
    12, 44,  4, 36, 14, 46,  6, 38,
    60, 28, 52, 20, 62, 30, 54, 22,
     3, 35, 11, 43,  1, 33,  9, 41,
    51, 19, 59, 27, 49, 17, 57, 25,
    15, 47,  7, 39, 13, 45,  5, 37,
    63, 31, 55, 23, 61, 29, 53, 21
};

static void ggl_init_procs(context_t* c);
static void ggl_set_scissor(context_t* c);

static void ggl_enable_blending(context_t* c, int enable);
static void ggl_enable_scissor_test(context_t* c, int enable);
static void ggl_enable_alpha_test(context_t* c, int enable);
static void ggl_enable_logic_op(context_t* c, int enable);
static void ggl_enable_dither(context_t* c, int enable);
static void ggl_enable_stencil_test(context_t* c, int enable);
static void ggl_enable_depth_test(context_t* c, int enable);
static void ggl_enable_aa(context_t* c, int enable);
static void ggl_enable_point_aa_nice(context_t* c, int enable);
static void ggl_enable_texture2d(context_t* c, int enable);
static void ggl_enable_w_lerp(context_t* c, int enable);
static void ggl_enable_fog(context_t* c, int enable);

static inline int min(int a, int b) CONST;
static inline int min(int a, int b) {
    return a < b ? a : b;
}

static inline int max(int a, int b) CONST;
static inline int max(int a, int b) {
    return a < b ? b : a;
}

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

void ggl_error(context_t* c, GGLenum error)
{
    if (c->error == GGL_NO_ERROR)
        c->error = error;
}

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

static void ggl_bindTexture(void* con, const GGLSurface* surface)
{
    GGL_CONTEXT(c, con);
    if (surface->format != c->activeTMU->surface.format)
        ggl_state_changed(c, GGL_TMU_STATE);    
    ggl_set_surface(c, &(c->activeTMU->surface), surface);
}


static void ggl_bindTextureLod(void* con, GGLuint tmu,const GGLSurface* surface)
{
    GGL_CONTEXT(c, con);
    // All LODs must have the same format
    ggl_set_surface(c, &c->state.texture[tmu].surface, surface);
}

static void ggl_colorBuffer(void* con, const GGLSurface* surface)
{
    GGL_CONTEXT(c, con);
    if (surface->format != c->state.buffers.color.format)
        ggl_state_changed(c, GGL_CB_STATE);

    if (surface->width > c->state.buffers.coverageBufferSize) {
        // allocate the coverage factor buffer
        free(c->state.buffers.coverage);
        c->state.buffers.coverage = (int16_t*)malloc(surface->width * 2);
        c->state.buffers.coverageBufferSize =
                c->state.buffers.coverage ? surface->width : 0;
    }
    ggl_set_surface(c, &(c->state.buffers.color), surface);
    if (c->state.buffers.read.format == 0) {
        ggl_set_surface(c, &(c->state.buffers.read), surface);
    }
    ggl_set_scissor(c);
}

static void ggl_readBuffer(void* con, const GGLSurface* surface)
{
    GGL_CONTEXT(c, con);
    ggl_set_surface(c, &(c->state.buffers.read), surface);
}

static void ggl_depthBuffer(void* con, const GGLSurface* surface)
{
    GGL_CONTEXT(c, con);
    if (surface->format == GGL_PIXEL_FORMAT_Z_16) {
        ggl_set_surface(c, &(c->state.buffers.depth), surface);
    } else {
        c->state.buffers.depth.format = GGL_PIXEL_FORMAT_NONE;
        ggl_enable_depth_test(c, 0);
    }
}

static void ggl_scissor(void* con, GGLint x, GGLint y,
        GGLsizei width, GGLsizei height)
{
    GGL_CONTEXT(c, con);
    c->state.scissor.user_left = x;
    c->state.scissor.user_top = y;
    c->state.scissor.user_right = x + width;
    c->state.scissor.user_bottom = y + height;
    ggl_set_scissor(c);
}

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

static void enable_disable(context_t* c, GGLenum name, int en)
{
    switch (name) {
    case GGL_BLEND:             ggl_enable_blending(c, en);      break;
    case GGL_SCISSOR_TEST:      ggl_enable_scissor_test(c, en);  break;
    case GGL_ALPHA_TEST:        ggl_enable_alpha_test(c, en);    break;
    case GGL_COLOR_LOGIC_OP:    ggl_enable_logic_op(c, en);      break;
    case GGL_DITHER:            ggl_enable_dither(c, en);        break;
    case GGL_STENCIL_TEST:      ggl_enable_stencil_test(c, en);  break;
    case GGL_DEPTH_TEST:        ggl_enable_depth_test(c, en);    break;
    case GGL_AA:                ggl_enable_aa(c, en);            break;
    case GGL_TEXTURE_2D:        ggl_enable_texture2d(c, en);     break;
    case GGL_W_LERP:            ggl_enable_w_lerp(c, en);        break;
    case GGL_FOG:               ggl_enable_fog(c, en);           break;
    case GGL_POINT_SMOOTH_NICE: ggl_enable_point_aa_nice(c, en); break;
    }
}

static void ggl_enable(void* con, GGLenum name)
{
    GGL_CONTEXT(c, con);
    enable_disable(c, name, 1);
}

static void ggl_disable(void* con, GGLenum name)
{
    GGL_CONTEXT(c, con);
    enable_disable(c, name, 0);
}

static void ggl_enableDisable(void* con, GGLenum name, GGLboolean en)
{
    GGL_CONTEXT(c, con);
    enable_disable(c, name, en ? 1 : 0);
}

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

static void ggl_shadeModel(void* con, GGLenum mode)
{
    GGL_CONTEXT(c, con);
    switch (mode) {
    case GGL_FLAT:
        if (c->state.enables & GGL_ENABLE_SMOOTH) {
            c->state.enables &= ~GGL_ENABLE_SMOOTH;
            ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
        }
        break;
    case GGL_SMOOTH:
        if (!(c->state.enables & GGL_ENABLE_SMOOTH)) {
            c->state.enables |= GGL_ENABLE_SMOOTH;
            ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
        }
        break;
    default:
        ggl_error(c, GGL_INVALID_ENUM);
    }
}

static void ggl_color4xv(void* con, const GGLclampx* color)
{
    GGL_CONTEXT(c, con);
	c->shade.r0 = gglFixedToIteratedColor(color[0]);
	c->shade.g0 = gglFixedToIteratedColor(color[1]);
	c->shade.b0 = gglFixedToIteratedColor(color[2]);
	c->shade.a0 = gglFixedToIteratedColor(color[3]);
}

static void ggl_colorGrad12xv(void* con, const GGLcolor* grad)
{
    GGL_CONTEXT(c, con);
    // it is very important to round the iterated value here because
    // the rasterizer doesn't clamp them, therefore the iterated value
    //must absolutely be correct.
    // GGLColor is encoded as 8.16 value
    const int32_t round = 0x8000;
	c->shade.r0   = grad[ 0] + round;
	c->shade.drdx = grad[ 1];
	c->shade.drdy = grad[ 2];
	c->shade.g0   = grad[ 3] + round;
	c->shade.dgdx = grad[ 4];
	c->shade.dgdy = grad[ 5];
	c->shade.b0   = grad[ 6] + round;
	c->shade.dbdx = grad[ 7];
	c->shade.dbdy = grad[ 8];
	c->shade.a0   = grad[ 9] + round;
	c->shade.dadx = grad[10];
	c->shade.dady = grad[11];
}

static void ggl_zGrad3xv(void* con, const GGLfixed32* grad)
{
    GGL_CONTEXT(c, con);
    // z iterators are encoded as 0.32 fixed point and the z-buffer
    // holds 16 bits, the rounding value is 0x8000.
    const uint32_t round = 0x8000;
	c->shade.z0   = grad[0] + round;
	c->shade.dzdx = grad[1];
	c->shade.dzdy = grad[2];
}

static void ggl_wGrad3xv(void* con, const GGLfixed* grad)
{
    GGL_CONTEXT(c, con);
	c->shade.w0   = grad[0];
	c->shade.dwdx = grad[1];
	c->shade.dwdy = grad[2];
}

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

static void ggl_fogGrad3xv(void* con, const GGLfixed* grad)
{
    GGL_CONTEXT(c, con);
	c->shade.f0     = grad[0];
	c->shade.dfdx   = grad[1];
	c->shade.dfdy   = grad[2];
}

static void ggl_fogColor3xv(void* con, const GGLclampx* color)
{
    GGL_CONTEXT(c, con);
    const int32_t r = gglClampx(color[0]);
    const int32_t g = gglClampx(color[1]);
    const int32_t b = gglClampx(color[2]);
	c->state.fog.color[GGLFormat::RED]  = (r - (r>>8))>>8;
	c->state.fog.color[GGLFormat::GREEN]= (g - (g>>8))>>8;
	c->state.fog.color[GGLFormat::BLUE] = (b - (b>>8))>>8;
}

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

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

static void ggl_blendFunc(void* con, GGLenum src, GGLenum dst)
{
    GGL_CONTEXT(c, con);
    c->state.blend.src = src;
    c->state.blend.src_alpha = src;
    c->state.blend.dst = dst;
    c->state.blend.dst_alpha = dst;
    c->state.blend.alpha_separate = 0;
    if (c->state.enables & GGL_ENABLE_BLENDING) {
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

static void ggl_blendFuncSeparate(void* con,
        GGLenum src, GGLenum dst,
        GGLenum srcAlpha, GGLenum dstAplha)
{
    GGL_CONTEXT(c, con);
    c->state.blend.src = src;
    c->state.blend.src_alpha = srcAlpha;
    c->state.blend.dst = dst;
    c->state.blend.dst_alpha = dstAplha;
    c->state.blend.alpha_separate = 1;
    if (c->state.enables & GGL_ENABLE_BLENDING) {
        ggl_state_changed(c, GGL_PIXEL_PIPELINE_STATE);
    }
}

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

static void ggl_texEnvi(void* con,	GGLenum target,
							GGLenum pname,
							GGLint param)
{
    GGL_CONTEXT(c, con);
    if (target != GGL_TEXTURE_ENV || pname != GGL_TEXTURE_ENV_MODE) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    switch (param) {
    case GGL_REPLACE:
    case GGL_MODULATE:
    case GGL_DECAL:
    case GGL_BLEND:
    case GGL_ADD:
        if (c->activeTMU->env != param) {
            c->activeTMU->env = param;
            ggl_state_changed(c, GGL_TMU_STATE);
        }
        break;
    default:
        ggl_error(c, GGL_INVALID_ENUM);
    }
}

static void ggl_texEnvxv(void* con, GGLenum target,
        GGLenum pname, const GGLfixed* params)
{
    GGL_CONTEXT(c, con);
    if (target != GGL_TEXTURE_ENV) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
    switch (pname) {
    case GGL_TEXTURE_ENV_MODE:
        ggl_texEnvi(con, target, pname, params[0]);
        break;
    case GGL_TEXTURE_ENV_COLOR: {
        uint8_t* const color = c->activeTMU->env_color;
        const GGLclampx r = gglClampx(params[0]);
        const GGLclampx g = gglClampx(params[1]);
        const GGLclampx b = gglClampx(params[2]);
        const GGLclampx a = gglClampx(params[3]);
        color[0] = (a-(a>>8))>>8;
        color[1] = (r-(r>>8))>>8;
        color[2] = (g-(g>>8))>>8;
        color[3] = (b-(b>>8))>>8;
        break;
    }
    default:
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }
}


static void ggl_texParameteri(void* con,
        GGLenum target,
        GGLenum pname,
        GGLint param)
{
    GGL_CONTEXT(c, con);
    if (target != GGL_TEXTURE_2D) {
        ggl_error(c, GGL_INVALID_ENUM);
        return;
    }

    if (param == GGL_CLAMP_TO_EDGE)
        param = GGL_CLAMP;

    uint16_t* what = 0;
    switch (pname) {
    case GGL_TEXTURE_WRAP_S:
        if ((param == GGL_CLAMP) ||
            (param == GGL_REPEAT)) {
            what = &c->activeTMU->s_wrap;
        }
        break;
    case GGL_TEXTURE_WRAP_T:
        if ((param == GGL_CLAMP) ||
            (param == GGL_REPEAT)) {
            what = &c->activeTMU->t_wrap;
        }
        break;
    case GGL_TEXTURE_MIN_FILTER:
        if ((param == GGL_NEAREST) ||
            (param == GGL_NEAREST_MIPMAP_NEAREST) ||
            (param == GGL_NEAREST_MIPMAP_LINEAR)) {
            what = &c->activeTMU->min_filter;
            param = GGL_NEAREST;
        }
        if ((param == GGL_LINEAR) ||