/*
 * shaders implementation
 *
 * Copyright 2002-2003 Jason Edmeades
 * Copyright 2002-2003 Raphael Junqueira
 * Copyright 2004 Christian Costa
 * Copyright 2005 Oliver Stieber
 * Copyright 2006 Ivan Gyurdiev
 * Copyright 2007-2008 Stefan Dösinger for CodeWeavers
 * Copyright 2009 Henri Verbeet for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include <math.h>
#include <stdio.h>

#include "wined3d_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(d3d_shader);

static HRESULT  WINAPI IWineD3DPixelShaderImpl_QueryInterface(IWineD3DPixelShader *iface, REFIID riid, LPVOID *ppobj) {
    TRACE("iface %p, riid %s, ppobj %p\n", iface, debugstr_guid(riid), ppobj);

    if (IsEqualGUID(riid, &IID_IWineD3DPixelShader)
            || IsEqualGUID(riid, &IID_IWineD3DBaseShader)
            || IsEqualGUID(riid, &IID_IWineD3DBase)
            || IsEqualGUID(riid, &IID_IUnknown))
    {
        IUnknown_AddRef(iface);
        *ppobj = iface;
        return S_OK;
    }

    WARN("%s not implemented, returning E_NOINTERFACE\n", debugstr_guid(riid));

    *ppobj = NULL;
    return E_NOINTERFACE;
}

static ULONG  WINAPI IWineD3DPixelShaderImpl_AddRef(IWineD3DPixelShader *iface) {
    IWineD3DPixelShaderImpl *This = (IWineD3DPixelShaderImpl *)iface;
    ULONG refcount = InterlockedIncrement(&This->baseShader.ref);

    TRACE("%p increasing refcount to %u\n", This, refcount);

    return refcount;
}

static ULONG  WINAPI IWineD3DPixelShaderImpl_Release(IWineD3DPixelShader *iface) {
    IWineD3DPixelShaderImpl *This = (IWineD3DPixelShaderImpl *)iface;
    ULONG refcount = InterlockedDecrement(&This->baseShader.ref);

    TRACE("%p decreasing refcount to %u\n", This, refcount);

    if (!refcount)
    {
        shader_cleanup((IWineD3DBaseShader *)iface);
        This->baseShader.parent_ops->wined3d_object_destroyed(This->baseShader.parent);
        HeapFree(GetProcessHeap(), 0, This);
    }

    return refcount;
}

/* *******************************************
   IWineD3DPixelShader IWineD3DPixelShader parts follow
   ******************************************* */

static HRESULT  WINAPI IWineD3DPixelShaderImpl_GetParent(IWineD3DPixelShader *iface, IUnknown** parent){
    IWineD3DPixelShaderImpl *This = (IWineD3DPixelShaderImpl *)iface;

    *parent = This->baseShader.parent;
    IUnknown_AddRef(*parent);
    TRACE("(%p) : returning %p\n", This, *parent);
    return WINED3D_OK;
}

static HRESULT  WINAPI IWineD3DPixelShaderImpl_GetDevice(IWineD3DPixelShader* iface, IWineD3DDevice **pDevice){
    IWineD3DPixelShaderImpl *This = (IWineD3DPixelShaderImpl *)iface;
    IWineD3DDevice_AddRef(This->baseShader.device);
    *pDevice = This->baseShader.device;
    TRACE("(%p) returning %p\n", This, *pDevice);
    return WINED3D_OK;
}


static HRESULT  WINAPI IWineD3DPixelShaderImpl_GetFunction(IWineD3DPixelShader* impl, VOID* pData, UINT* pSizeOfData) {
  IWineD3DPixelShaderImpl *This = (IWineD3DPixelShaderImpl *)impl;
  TRACE("(%p) : pData(%p), pSizeOfData(%p)\n", This, pData, pSizeOfData);

  if (NULL == pData) {
    *pSizeOfData = This->baseShader.functionLength;
    return WINED3D_OK;
  }
  if (*pSizeOfData < This->baseShader.functionLength) {
    /* MSDN claims (for d3d8 at least) that if *pSizeOfData is smaller
     * than the required size we should write the required size and
     * return D3DERR_MOREDATA. That's not actually true. */
    return WINED3DERR_INVALIDCALL;
  }

  TRACE("(%p) : GetFunction copying to %p\n", This, pData);
  memcpy(pData, This->baseShader.function, This->baseShader.functionLength);

  return WINED3D_OK;
}

static void pshader_set_limits(IWineD3DPixelShaderImpl *This)
{
    DWORD shader_version = WINED3D_SHADER_VERSION(This->baseShader.reg_maps.shader_version.major,
            This->baseShader.reg_maps.shader_version.minor);

    This->baseShader.limits.attributes = 0;
    This->baseShader.limits.address = 0;
    This->baseShader.limits.packed_output = 0;

    switch (shader_version)
    {
        case WINED3D_SHADER_VERSION(1,0):
        case WINED3D_SHADER_VERSION(1,1):
        case WINED3D_SHADER_VERSION(1,2):
        case WINED3D_SHADER_VERSION(1,3):
            This->baseShader.limits.temporary = 2;
            This->baseShader.limits.constant_float = 8;
            This->baseShader.limits.constant_int = 0;
            This->baseShader.limits.constant_bool = 0;
            This->baseShader.limits.texcoord = 4;
            This->baseShader.limits.sampler = 4;
            This->baseShader.limits.packed_input = 0;
            This->baseShader.limits.label = 0;
            break;

        case WINED3D_SHADER_VERSION(1,4):
            This->baseShader.limits.temporary = 6;
            This->baseShader.limits.constant_float = 8;
            This->baseShader.limits.constant_int = 0;
            This->baseShader.limits.constant_bool = 0;
            This->baseShader.limits.texcoord = 6;
            This->baseShader.limits.sampler = 6;
            This->baseShader.limits.packed_input = 0;
            This->baseShader.limits.label = 0;
            break;

        /* FIXME: temporaries must match D3DPSHADERCAPS2_0.NumTemps */
        case WINED3D_SHADER_VERSION(2,0):
            This->baseShader.limits.temporary = 32;
            This->baseShader.limits.constant_float = 32;
            This->baseShader.limits.constant_int = 16;
            This->baseShader.limits.constant_bool = 16;
            This->baseShader.limits.texcoord = 8;
            This->baseShader.limits.sampler = 16;
            This->baseShader.limits.packed_input = 0;
            break;

        case WINED3D_SHADER_VERSION(2,1):
            This->baseShader.limits.temporary = 32;
            This->baseShader.limits.constant_float = 32;
            This->baseShader.limits.constant_int = 16;
            This->baseShader.limits.constant_bool = 16;
            This->baseShader.limits.texcoord = 8;
            This->baseShader.limits.sampler = 16;
            This->baseShader.limits.packed_input = 0;
            This->baseShader.limits.label = 16;
            break;

        case WINED3D_SHADER_VERSION(4,0):
            FIXME("Using 3.0 limits for 4.0 shader\n");
            /* Fall through */

        case WINED3D_SHADER_VERSION(3,0):
            This->baseShader.limits.temporary = 32;
            This->baseShader.limits.constant_float = 224;
            This->baseShader.limits.constant_int = 16;
            This->baseShader.limits.constant_bool = 16;
            This->baseShader.limits.texcoord = 0;
            This->baseShader.limits.sampler = 16;
            This->baseShader.limits.packed_input = 12;
            This->baseShader.limits.label = 16; /* FIXME: 2048 */
            break;

        default:
            This->baseShader.limits.temporary = 32;
            This->baseShader.limits.constant_float = 32;
            This->baseShader.limits.constant_int = 16;
            This->baseShader.limits.constant_bool = 16;
            This->baseShader.limits.texcoord = 8;
            This->baseShader.limits.sampler = 16;
            This->baseShader.limits.packed_input = 0;
            This->baseShader.limits.label = 0;
            FIXME("Unrecognized pixel shader version %u.%u\n",
                    This->baseShader.reg_maps.shader_version.major,
                    This->baseShader.reg_maps.shader_version.minor);
    }
}

static HRESULT pixelshader_set_function(IWineD3DPixelShaderImpl *shader,
        const DWORD *byte_code, const struct wined3d_shader_signature *output_signature)
{
    IWineD3DDeviceImpl *device = (IWineD3DDeviceImpl *)shader->baseShader.device;
    const struct wined3d_gl_info *gl_info = &device->adapter->gl_info;
    unsigned int i, highest_reg_used = 0, num_regs_used = 0;
    shader_reg_maps *reg_maps = &shader->baseShader.reg_maps;
    const struct wined3d_shader_frontend *fe;
    HRESULT hr;

    TRACE("shader %p, byte_code %p, output_signature %p.\n", shader, byte_code, output_signature);

    fe = shader_select_frontend(*byte_code);
    if (!fe)
    {
        FIXME("Unable to find frontend for shader.\n");
        return WINED3DERR_INVALIDCALL;
    }
    shader->baseShader.frontend = fe;
    shader->baseShader.frontend_data = fe->shader_init(byte_code, output_signature);
    if (!shader->baseShader.frontend_data)
    {
        FIXME("Failed to initialize frontend.\n");
        return WINED3DERR_INVALIDCALL;
    }

    /* First pass: trace shader */
    if (TRACE_ON(d3d_shader)) shader_trace_init(fe, shader->baseShader.frontend_data, byte_code);

    /* Initialize immediate constant lists */
    list_init(&shader->baseShader.constantsF);
    list_init(&shader->baseShader.constantsB);
    list_init(&shader->baseShader.constantsI);

    /* Second pass: figure out which registers are used, what the semantics are, etc.. */
    hr = shader_get_registers_used((IWineD3DBaseShader *)shader, fe,
            reg_maps, NULL, shader->input_signature, NULL,
            byte_code, device->d3d_pshader_constantF);
    if (FAILED(hr)) return hr;

    pshader_set_limits(shader);

    for (i = 0; i < MAX_REG_INPUT; ++i)
    {
        if (shader->input_reg_used[i])
        {
            ++num_regs_used;
            highest_reg_used = i;
        }
    }

    /* Don't do any register mapping magic if it is not needed, or if we can't
     * achieve anything anyway */
    if (highest_reg_used < (gl_info->limits.glsl_varyings / 4)
            || num_regs_used > (gl_info->limits.glsl_varyings / 4))
    {
        if (num_regs_used > (gl_info->limits.glsl_varyings / 4))
        {
            /* This happens with relative addressing. The input mapper function
             * warns about this if the higher registers are declared too, so
             * don't write a FIXME here */
            WARN("More varying registers used than supported\n");
        }

        for (i = 0; i < MAX_REG_INPUT; ++i)
        {
            shader->input_reg_map[i] = i;
        }

        shader->declared_in_count = highest_reg_used + 1;
    }
    else
    {
        shader->declared_in_count = 0;
        for (i = 0; i < MAX_REG_INPUT; ++i)
        {
            if (shader->input_reg_used[i]) shader->input_reg_map[i] = shader->declared_in_count++;
            else shader->input_reg_map[i] = ~0U;
        }
    }

    shader->baseShader.load_local_constsF = FALSE;

    TRACE("(%p) : Copying byte code.\n", shader);

    shader->baseShader.function = HeapAlloc(GetProcessHeap(), 0, shader->baseShader.functionLength);
    if (!shader->baseShader.function) return E_OUTOFMEMORY;
    memcpy(shader->baseShader.function, byte_code, shader->baseShader.functionLength);

    return WINED3D_OK;
}

void pixelshader_update_samplers(struct shader_reg_maps *reg_maps, IWineD3DBaseTexture * const *textures)
{
    WINED3DSAMPLER_TEXTURE_TYPE *sampler_type = reg_maps->sampler_type;
    unsigned int i;

    if (reg_maps->shader_version.major != 1) return;

    for (i = 0; i < max(MAX_FRAGMENT_SAMPLERS, MAX_VERTEX_SAMPLERS); ++i)
    {
        /* We don't sample from this sampler */
        if (!sampler_type[i]) continue;

        if (!textures[i])
        {
            ERR("No texture bound to sampler %u, using 2D\n", i);
            sampler_type[i] = WINED3DSTT_2D;
            continue;
        }

        switch (IWineD3DBaseTexture_GetTextureDimensions(textures[i]))
        {
            case GL_TEXTURE_RECTANGLE_ARB:
            case GL_TEXTURE_2D:
                /* We have to select between texture rectangles and 2D textures later because 2.0 and
                 * 3.0 shaders only have WINED3DSTT_2D as well */
                sampler_type[i] = WINED3DSTT_2D;
                break;

            case GL_TEXTURE_3D:
                sampler_type[i] = WINED3DSTT_VOLUME;
                break;

            case GL_TEXTURE_CUBE_MAP_ARB:
                sampler_type[i] = WINED3DSTT_CUBE;
                break;

            default:
                FIXME("Unrecognized texture type %#x, using 2D\n",
                        IWineD3DBaseTexture_GetTextureDimensions(textures[i]));
                sampler_type[i] = WINED3DSTT_2D;
        }
    }
}

static const IWineD3DPixelShaderVtbl IWineD3DPixelShader_Vtbl =
{
    /*** IUnknown methods ***/
    IWineD3DPixelShaderImpl_QueryInterface,
    IWineD3DPixelShaderImpl_AddRef,
    IWineD3DPixelShaderImpl_Release,
    /*** IWineD3DBase methods ***/
    IWineD3DPixelShaderImpl_GetParent,
    /*** IWineD3DBaseShader methods ***/
    IWineD3DPixelShaderImpl_GetDevice,
    IWineD3DPixelShaderImpl_GetFunction
    /*** IWineD3DPixelShader methods ***/
};

void find_ps_compile_args(IWineD3DPixelShaderImpl *shader, IWineD3DStateBlockImpl *stateblock, struct ps_compile_args *args) {
    UINT i;
    IWineD3DBaseTextureImpl *tex;

    memset(args, 0, sizeof(*args)); /* FIXME: Make sure all bits are set */
    args->srgb_correction = stateblock->renderState[WINED3DRS_SRGBWRITEENABLE] ? 1 : 0;
    args->np2_fixup = 0;

    for(i = 0; i < MAX_FRAGMENT_SAMPLERS; i++) {
        if (!shader->baseShader.reg_maps.sampler_type[i]) continue;
        tex = (IWineD3DBaseTextureImpl *) stateblock->textures[i];
        if(!tex) {
            args->color_fixup[i] = COLOR_FIXUP_IDENTITY;
            continue;
        }
        args->color_fixup[i] = tex->resource.format_desc->color_fixup;

        /* Flag samplers that need NP2 texcoord fixup. */
        if(!tex->baseTexture.pow2Matrix_identity) {
            args->np2_fixup |= (1 << i);
        }
    }
    if (shader->baseShader.reg_maps.shader_version.major >= 3)
    {
        if (((IWineD3DDeviceImpl *)shader->baseShader.device)->strided_streams.position_transformed)
        {
            args->vp_mode = pretransformed;
        }
        else if (use_vs(stateblock))
        {
            args->vp_mode = vertexshader;
        } else {
            args->vp_mode = fixedfunction;
        }
        args->fog = FOG_OFF;
    } else {
        args->vp_mode = vertexshader;
        if(stateblock->renderState[WINED3DRS_FOGENABLE]) {
            switch(stateblock->renderState[WINED3DRS_FOGTABLEMODE]) {
                case WINED3DFOG_NONE:
                    if (((IWineD3DDeviceImpl *)shader->baseShader.device)->strided_streams.position_transformed
                            || use_vs(stateblock))
                    {
                        args->fog = FOG_LINEAR;
                        break;
                    }
                    switch(stateblock->renderState[WINED3DRS_FOGVERTEXMODE]) {
                        case WINED3DFOG_NONE: /* Drop through */
                        case WINED3DFOG_LINEAR: args->fog = FOG_LINEAR; break;
                        case WINED3DFOG_EXP:    args->fog = FOG_EXP;    break;
                        case WINED3DFOG_EXP2:   args->fog = FOG_EXP2;   break;
                    }
                    break;

                case WINED3DFOG_LINEAR: args->fog = FOG_LINEAR; break;
                case WINED3DFOG_EXP:    args->fog = FOG_EXP;    break;
                case WINED3DFOG_EXP2:   args->fog = FOG_EXP2;   break;
            }
        } else {
            args->fog = FOG_OFF;
        }
    }
}

HRESULT pixelshader_init(IWineD3DPixelShaderImpl *shader, IWineD3DDeviceImpl *device,
        const DWORD *byte_code, const struct wined3d_shader_signature *output_signature,
        IUnknown *parent, const struct wined3d_parent_ops *parent_ops)
{
    HRESULT hr;

    if (!byte_code) return WINED3DERR_INVALIDCALL;

    shader->lpVtbl = &IWineD3DPixelShader_Vtbl;
    shader_init(&shader->baseShader, device, parent, parent_ops);

    hr = pixelshader_set_function(shader, byte_code, output_signature);
    if (FAILED(hr))
    {
        WARN("Failed to set function, hr %#x.\n", hr);
        shader_cleanup((IWineD3DBaseShader *)shader);
        return hr;
    }

    return WINED3D_OK;
}