gpu/src/GrGLTexture.cpp

/*
    Copyright 2011 Google Inc.

    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 "GrGLTexture.h"
#include "GrGpuGL.h"

#define GPUGL static_cast<GrGpuGL*>(getGpu())

GrGLRenderTarget::GrGLRenderTarget(GrGpuGL* gpu,
                                   const GLRenderTargetIDs& ids,
                                   GrGLTexID* texID,
                                   GrGLuint stencilBits,
                                   bool isMultisampled,
                                   const GrGLIRect& viewport,
                                   GrGLTexture* texture)
    : INHERITED(gpu, texture, viewport.fWidth, 
                viewport.fHeight, stencilBits, isMultisampled) {
    fRTFBOID                = ids.fRTFBOID;
    fTexFBOID               = ids.fTexFBOID;
    fStencilRenderbufferID  = ids.fStencilRenderbufferID;
    fMSColorRenderbufferID  = ids.fMSColorRenderbufferID;
    fViewport               = viewport;
    fOwnIDs                 = ids.fOwnIDs;
    fTexIDObj               = texID;
    GrSafeRef(fTexIDObj);
}

void GrGLRenderTarget::onRelease() {
    GPUGL->notifyRenderTargetDelete(this);
    if (fOwnIDs) {
        if (fTexFBOID) {
            GR_GL(DeleteFramebuffers(1, &fTexFBOID));
        }
        if (fRTFBOID && fRTFBOID != fTexFBOID) {
            GR_GL(DeleteFramebuffers(1, &fRTFBOID));
        }
        if (fStencilRenderbufferID) {
            GR_GL(DeleteRenderbuffers(1, &fStencilRenderbufferID));
        }
        if (fMSColorRenderbufferID) {
            GR_GL(DeleteRenderbuffers(1, &fMSColorRenderbufferID));
        }
    }
    fRTFBOID                = 0;
    fTexFBOID               = 0;
    fStencilRenderbufferID  = 0;
    fMSColorRenderbufferID  = 0;
    GrSafeUnref(fTexIDObj);
    fTexIDObj = NULL;
}

void GrGLRenderTarget::onAbandon() {
    fRTFBOID                = 0;
    fTexFBOID               = 0;
    fStencilRenderbufferID  = 0;
    fMSColorRenderbufferID  = 0;
    if (NULL != fTexIDObj) {
        fTexIDObj->abandon();
        fTexIDObj = NULL;
    }
}


////////////////////////////////////////////////////////////////////////////////

const GrGLenum* GrGLTexture::WrapMode2GLWrap() {
    static const GrGLenum mirrorRepeatModes[] = {
        GR_GL_CLAMP_TO_EDGE,
        GR_GL_REPEAT,
        GR_GL_MIRRORED_REPEAT
    };

    static const GrGLenum repeatModes[] = {
        GR_GL_CLAMP_TO_EDGE,
        GR_GL_REPEAT,
        GR_GL_REPEAT
    };

    if (GR_GL_SUPPORT_ES1 && !GR_GL_SUPPORT_ES2) {
        return repeatModes;  // GL_MIRRORED_REPEAT not supported.
    } else {
        return mirrorRepeatModes;
    }
};

GrGLTexture::GrGLTexture(GrGpuGL* gpu,
                         const GLTextureDesc& textureDesc,
                         const GLRenderTargetIDs& rtIDs,
                         const TexParams& initialTexParams)
    : INHERITED(gpu,
                textureDesc.fContentWidth,
                textureDesc.fContentHeight,
                textureDesc.fFormat) {

    fTexParams          = initialTexParams;
    fTexIDObj           = new GrGLTexID(textureDesc.fTextureID,
                                        textureDesc.fOwnsID);
    fUploadFormat       = textureDesc.fUploadFormat;
    fUploadByteCount    = textureDesc.fUploadByteCount;
    fUploadType         = textureDesc.fUploadType;
    fOrientation        = textureDesc.fOrientation;
    fAllocWidth         = textureDesc.fAllocWidth;
    fAllocHeight        = textureDesc.fAllocHeight;
    fScaleX             = GrIntToScalar(textureDesc.fContentWidth) /
                            textureDesc.fAllocWidth;
    fScaleY             = GrIntToScalar(textureDesc.fContentHeight) /
                            textureDesc.fAllocHeight;

    GrAssert(0 != textureDesc.fTextureID);

    if (rtIDs.fTexFBOID) {
        // we render to the top left
        GrGLIRect vp;
        vp.fLeft   = 0;
        vp.fWidth  = textureDesc.fContentWidth;
        vp.fHeight = textureDesc.fContentHeight;
        vp.fBottom = textureDesc.fAllocHeight - textureDesc.fContentHeight;

        fRenderTarget = new GrGLRenderTarget(gpu, rtIDs, fTexIDObj,
                                             textureDesc.fStencilBits,
                                             rtIDs.fRTFBOID != rtIDs.fTexFBOID,
                                             vp, this);
    }
}

void GrGLTexture::onRelease() {
    INHERITED::onRelease();
    GPUGL->notifyTextureDelete(this);
    if (NULL != fTexIDObj) {
        fTexIDObj->unref();
        fTexIDObj = NULL;
    }
}

void GrGLTexture::onAbandon() {
    INHERITED::onAbandon();
    if (NULL != fTexIDObj) {
        fTexIDObj->abandon();
    }
}

void GrGLTexture::uploadTextureData(int x,
                                    int y,
                                    int width,
                                    int height,
                                    const void* srcData,
                                    size_t rowBytes) {

    GPUGL->setSpareTextureUnit();

    // ES2 glCompressedTexSubImage2D doesn't support any formats
    // (at least without extensions)
    GrAssert(fUploadFormat != GR_GL_PALETTE8_RGBA8);

    // in case we need a temporary, trimmed copy of the src pixels
    SkAutoSMalloc<128 * 128> tempStorage;

    if (!rowBytes) {
        rowBytes = fUploadByteCount * width;
    }
    /*
     *  check whether to allocate a temporary buffer for flipping y or
     *  because our srcData has extra bytes past each row. If so, we need
     *  to trim those off here, since GL ES doesn't let us specify
     *  GL_UNPACK_ROW_LENGTH.
     */
    bool restoreGLRowLength = false;
    bool flipY = kBottomUp_Orientation == fOrientation;
    if (GR_GL_SUPPORT_DESKTOP && !flipY) {
        // can't use this for flipping, only non-neg values allowed. :(
        if (srcData && rowBytes) {
            GR_GL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH,
                              rowBytes / fUploadByteCount));
            restoreGLRowLength = true;
        }
    } else {
        size_t trimRowBytes = width * fUploadByteCount;
        if (srcData && (trimRowBytes < rowBytes || flipY)) {
            // copy the data into our new storage, skipping the trailing bytes
            size_t trimSize = height * trimRowBytes;
            const char* src = (const char*)srcData;
            if (flipY) {
                src += (height - 1) * rowBytes;
            }
            char* dst = (char*)tempStorage.realloc(trimSize);
            for (int y = 0; y < height; y++) {
                memcpy(dst, src, trimRowBytes);
                if (flipY) {
                    src -= rowBytes;
                } else {
                    src += rowBytes;
                }
                dst += trimRowBytes;
            }
            // now point srcData to our copied version
            srcData = tempStorage.get();
        }
    }

    if (flipY) {
        y = this->height() - (y + height);
    }
    GR_GL(BindTexture(GR_GL_TEXTURE_2D, fTexIDObj->id()));
    GR_GL(PixelStorei(GR_GL_UNPACK_ALIGNMENT, fUploadByteCount));
    GR_GL(TexSubImage2D(GR_GL_TEXTURE_2D, 0, x, y, width, height,
                        fUploadFormat, fUploadType, srcData));

    if (GR_GL_SUPPORT_DESKTOP) {
        if (restoreGLRowLength) {
            GR_GL(PixelStorei(GR_GL_UNPACK_ROW_LENGTH, 0));
        }
    }
}

intptr_t GrGLTexture::getTextureHandle() {
    return fTexIDObj->id();
}