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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/modules/webgl/webgl_texture.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
namespace blink {
WebGLTexture::WebGLTexture(WebGLRenderingContextBase* ctx)
: WebGLSharedPlatform3DObject(ctx), target_(0) {
GLuint texture;
ctx->ContextGL()->GenTextures(1, &texture);
SetObject(texture);
}
WebGLTexture::~WebGLTexture() = default;
void WebGLTexture::SetTarget(GLenum target) {
if (!Object())
return;
// Target is finalized the first time bindTexture() is called.
if (target_)
return;
target_ = target;
}
void WebGLTexture::DeleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
gl->DeleteTextures(1, &object_);
object_ = 0;
}
int WebGLTexture::MapTargetToIndex(GLenum target) const {
if (target_ == GL_TEXTURE_2D) {
if (target == GL_TEXTURE_2D)
return 0;
} else if (target_ == GL_TEXTURE_CUBE_MAP) {
switch (target) {
case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
return 0;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
return 1;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
return 2;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
return 3;
case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
return 4;
case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
return 5;
}
} else if (target_ == GL_TEXTURE_3D) {
if (target == GL_TEXTURE_3D)
return 0;
} else if (target_ == GL_TEXTURE_2D_ARRAY) {
if (target == GL_TEXTURE_2D_ARRAY)
return 0;
}
return -1;
}
GLint WebGLTexture::ComputeLevelCount(GLsizei width,
GLsizei height,
GLsizei depth) {
// return 1 + log2Floor(std::max(width, height));
GLsizei n = std::max(std::max(width, height), depth);
if (n <= 0)
return 0;
GLint log = 0;
GLsizei value = n;
for (int ii = 4; ii >= 0; --ii) {
int shift = (1 << ii);
GLsizei x = (value >> shift);
if (x) {
value = x;
log += shift;
}
}
DCHECK_EQ(value, 1);
return log + 1;
}
} // namespace blink
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