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/*
* Copyright (c) 2010, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 "config.h"
#if USE(GLES2_RENDERING)
#include "GLES2Texture.h"
#include <GLES2/gl2.h>
#include <wtf/OwnArrayPtr.h>
namespace WebCore {
GLES2Texture::GLES2Texture(unsigned int textureId, Format format, int width, int height)
: m_textureId(textureId)
, m_format(format)
, m_width(width)
, m_height(height)
{
}
GLES2Texture::~GLES2Texture()
{
glDeleteTextures(1, &m_textureId);
}
PassRefPtr<GLES2Texture> GLES2Texture::create(Format format, int width, int height)
{
GLuint textureId;
glGenTextures(1, &textureId);
if (!textureId)
return 0;
glBindTexture(GL_TEXTURE_2D, textureId);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
int max;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max);
if (width > max || height > max)
ASSERT(!"texture too big");
return adoptRef(new GLES2Texture(textureId, format, width, height));
}
static void convertFormat(GLES2Texture::Format format, unsigned int* glFormat, unsigned int* glType, bool* swizzle)
{
*swizzle = false;
switch (format) {
case GLES2Texture::RGBA8:
*glFormat = GL_RGBA;
*glType = GL_UNSIGNED_BYTE;
break;
case GLES2Texture::BGRA8:
// FIXME: Once we have support for extensions, we should check for EXT_texture_format_BGRA8888,
// and use that if present.
*glFormat = GL_RGBA;
*glType = GL_UNSIGNED_BYTE;
*swizzle = true;
break;
default:
ASSERT(!"bad format");
break;
}
}
void GLES2Texture::load(void* pixels)
{
unsigned int glFormat, glType;
bool swizzle;
convertFormat(m_format, &glFormat, &glType, &swizzle);
glBindTexture(GL_TEXTURE_2D, m_textureId);
if (swizzle) {
ASSERT(glFormat == GL_RGBA && glType == GL_UNSIGNED_BYTE);
// FIXME: This could use PBO's to save doing an extra copy here.
int size = m_width * m_height;
unsigned* pixels32 = static_cast<unsigned*>(pixels);
OwnArrayPtr<unsigned> buf(new unsigned[size]);
unsigned* bufptr = buf.get();
for (int i = 0; i < size; ++i) {
unsigned pixel = pixels32[i];
bufptr[i] = pixel & 0xFF00FF00 | ((pixel & 0x00FF0000) >> 16) | ((pixel & 0x000000FF) << 16);
}
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, glFormat, glType, buf.get());
} else
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, glFormat, glType, pixels);
}
void GLES2Texture::bind()
{
glBindTexture(GL_TEXTURE_2D, m_textureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
}
#endif
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