/****************************************************************************
 * Copyright (C) 2015 Dimok
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/
#ifndef PIXEL_SHADER_H
#define PIXEL_SHADER_H

#include <gui/video/shaders/Shader.h>

class PixelShader : public Shader {
public:
    PixelShader()
            : pixelShader((GX2PixelShader *) memalign(0x40, sizeof(GX2PixelShader))) {
        if (pixelShader) {
            memset(pixelShader, 0, sizeof(GX2PixelShader));
            pixelShader->mode = GX2_SHADER_MODE_UNIFORM_REGISTER;
        }
    }

    virtual ~PixelShader() {
        if (pixelShader) {
            if (pixelShader->program) {
                free(pixelShader->program);
            }

            for (uint32_t i = 0; i < pixelShader->uniformBlockCount; i++) {
                free((void *) pixelShader->uniformBlocks[i].name);
            }

            if (pixelShader->uniformBlocks) {
                free((void *) pixelShader->uniformBlocks);
            }

            for (uint32_t i = 0; i < pixelShader->uniformVarCount; i++) {
                free((void *) pixelShader->uniformVars[i].name);
            }

            if (pixelShader->uniformVars) {
                free((void *) pixelShader->uniformVars);
            }

            if (pixelShader->initialValues) {
                free((void *) pixelShader->initialValues);
            }

            for (uint32_t i = 0; i < pixelShader->samplerVarCount; i++) {
                free((void *) pixelShader->samplerVars[i].name);
            }

            if (pixelShader->samplerVars) {
                free((void *) pixelShader->samplerVars);
            }

            if (pixelShader->loopVars) {
                free((void *) pixelShader->loopVars);
            }

            free(pixelShader);
        }
    }

    void setProgram(const uint32_t *program, const uint32_t &programSize, const uint32_t *regs, const uint32_t &regsSize) {
        if (!pixelShader) {
            return;
        }

        //! this must be moved into an area where the graphic engine has access to and must be aligned to 0x100
        pixelShader->size = programSize;
        pixelShader->program = (uint8_t *) memalign(GX2_SHADER_PROGRAM_ALIGNMENT, pixelShader->size);
        if (pixelShader->program) {
            memcpy(pixelShader->program, program, pixelShader->size);
            GX2Invalidate(GX2_INVALIDATE_MODE_CPU_SHADER, pixelShader->program, pixelShader->size);
        }

        memcpy(&pixelShader->regs, regs, regsSize);
    }

    void addUniformVar(const GX2UniformVar &var) {
        if (!pixelShader) {
            return;
        }

        uint32_t idx = pixelShader->uniformVarCount;

        GX2UniformVar *newVar = (GX2UniformVar *) malloc((pixelShader->uniformVarCount + 1) * sizeof(GX2UniformVar));
        if (newVar) {
            if (pixelShader->uniformVars) {
                memcpy(newVar, pixelShader->uniformVars, pixelShader->uniformVarCount * sizeof(GX2UniformVar));
                free(pixelShader->uniformVars);
            }
            pixelShader->uniformVars = newVar;

            memcpy(pixelShader->uniformVars + idx, &var, sizeof(GX2UniformVar));
            pixelShader->uniformVars[idx].name = (char *) malloc(strlen(var.name) + 1);
            strcpy((char *) pixelShader->uniformVars[idx].name, var.name);

            pixelShader->uniformVarCount++;
        }
    }

    void addSamplerVar(const GX2SamplerVar &var) {
        if (!pixelShader) {
            return;
        }

        uint32_t idx = pixelShader->samplerVarCount;

        GX2SamplerVar *newVar = (GX2SamplerVar *) malloc((pixelShader->samplerVarCount + 1) * sizeof(GX2SamplerVar));
        if (newVar) {
            if (pixelShader->samplerVars) {
                memcpy(newVar, pixelShader->samplerVars, pixelShader->samplerVarCount * sizeof(GX2SamplerVar));
                free(pixelShader->samplerVars);
            }
            pixelShader->samplerVars = newVar;

            memcpy(pixelShader->samplerVars + idx, &var, sizeof(GX2SamplerVar));
            pixelShader->samplerVars[idx].name = (char *) malloc(strlen(var.name) + 1);
            strcpy((char *) pixelShader->samplerVars[idx].name, var.name);

            pixelShader->samplerVarCount++;
        }
    }

    GX2PixelShader *getPixelShader() const {
        return pixelShader;
    }

    void setShader(void) const {
        GX2SetPixelShader(pixelShader);
    }

    static inline void setUniformReg(uint32_t location, uint32_t size, const void *reg) {
        GX2SetPixelUniformReg(location, size, (uint32_t *) reg);
    }

protected:
    GX2PixelShader *pixelShader;
};

#endif // PIXEL_SHADER_H