/****************************************************************************
Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2020 c4games.com
http://www.cocos2d-x.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "DeviceInfoGL.h"
#include "platform/CCGL.h"
#if !defined(GL_COMPRESSED_RGBA8_ETC2_EAC)
# define GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
// #define GL_COMPRESSED_RGB8_ETC2 0x9274
#endif
#if !defined(GL_COMPRESSED_RGBA_ASTC_4x4)
# define GL_COMPRESSED_RGBA_ASTC_4x4 0x93B0
// #define GL_COMPRESSED_RGBA_ASTC_8x8 0x93B7
#endif
CC_BACKEND_BEGIN
///
/// 1px method to detect whether GPU support astc compressed texture really
///
/// true: support, false: not support
static bool checkReallySupportsASTC()
{
const GLsizei TEXTURE_DIM = 1;
// 1px/2px astc 4x4 compressed texels srgb
uint8_t astctexels[] = {0xfc, 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0x80, 0x80, 0x00, 0x00, 0xff, 0xff};
GLuint texID = 0;
glGenTextures(1, &texID);
glBindTexture(GL_TEXTURE_2D, texID);
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);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glCompressedTexImage2D(GL_TEXTURE_2D,
0, // level
GL_COMPRESSED_RGBA_ASTC_4x4_KHR, // format
TEXTURE_DIM, TEXTURE_DIM,
0, // border
sizeof(astctexels), // dataLen,
astctexels);
auto error = glGetError();
#if CC_TARGET_PLATFORM != CC_PLATFORM_ANDROID
if (!error)
{
// read pixel RGB: should be: 255, 128, 0
uint8_t pixels[TEXTURE_DIM * TEXTURE_DIM * 4] = {0};
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
error = glGetError();
if (error || pixels[0] != 255 || pixels[1] != 128)
{
error = GL_INVALID_VALUE;
}
}
#endif
glBindTexture(GL_TEXTURE_2D, 0); // unbind texture
glDeleteTextures(1, &texID);
return !error;
}
bool DeviceInfoGL::init()
{
glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &_maxAttributes);
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &_maxTextureSize);
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &_maxTextureUnits);
_glExtensions = (const char*)glGetString(GL_EXTENSIONS);
return true;
}
const char* DeviceInfoGL::getVendor() const
{
return (const char*)glGetString(GL_VENDOR);
}
const char* DeviceInfoGL::getRenderer() const
{
return (const char*)glGetString(GL_RENDERER);
}
const char* DeviceInfoGL::getVersion() const
{
return (const char*)glGetString(GL_VERSION);
}
const char* DeviceInfoGL::getExtension() const
{
return _glExtensions.c_str();
}
bool DeviceInfoGL::checkForFeatureSupported(FeatureType feature)
{
bool featureSupported = false;
switch (feature)
{
case FeatureType::ETC1:
featureSupported = checkForGLExtension("GL_OES_compressed_ETC1_RGB8_texture");
break;
case FeatureType::ETC2:
featureSupported = checkSupportsCompressedFormat(GL_COMPRESSED_RGBA8_ETC2_EAC);
break;
case FeatureType::S3TC:
#ifdef GL_EXT_texture_compression_s3tc
featureSupported = checkForGLExtension("GL_EXT_texture_compression_s3tc");
#endif
break;
case FeatureType::AMD_COMPRESSED_ATC:
featureSupported = checkForGLExtension("GL_AMD_compressed_ATC_texture");
break;
case FeatureType::PVRTC:
featureSupported = checkForGLExtension("GL_IMG_texture_compression_pvrtc");
break;
case FeatureType::IMG_FORMAT_BGRA8888:
featureSupported = checkForGLExtension("GL_IMG_texture_format_BGRA8888");
break;
case FeatureType::DISCARD_FRAMEBUFFER:
featureSupported = checkForGLExtension("GL_EXT_discard_framebuffer");
break;
case FeatureType::PACKED_DEPTH_STENCIL:
featureSupported = checkForGLExtension("GL_OES_packed_depth_stencil");
break;
case FeatureType::VAO:
#ifdef CC_PLATFORM_PC
featureSupported = checkForGLExtension("vertex_array_object");
#else
featureSupported = checkForGLExtension("GL_OES_vertex_array_object");
#endif
break;
case FeatureType::MAPBUFFER:
featureSupported = checkForGLExtension("GL_OES_mapbuffer");
break;
case FeatureType::DEPTH24:
featureSupported = checkForGLExtension("GL_OES_depth24");
break;
case FeatureType::ASTC:
featureSupported = checkReallySupportsASTC();
break;
default:
break;
}
return featureSupported;
}
bool DeviceInfoGL::checkForGLExtension(const std::string& searchName) const
{
return _glExtensions.find(searchName) != std::string::npos;
}
bool DeviceInfoGL::checkSupportsCompressedFormat(int compressedFormat)
{
const int MAX_ALLOCA_SIZE = 512;
GLint numFormats = 0;
glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
GLint* formats = nullptr;
int buffersize = numFormats * sizeof(GLint);
if (buffersize <= MAX_ALLOCA_SIZE)
formats = (GLint*)alloca(buffersize);
else
formats = (GLint*)malloc(buffersize);
glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, formats);
bool supported = false;
for (GLint i = 0; i < numFormats; ++i)
{
if (formats[i] == compressedFormat)
{
supported = true;
break;
}
}
if (buffersize > MAX_ALLOCA_SIZE)
free(formats);
return supported;
}
CC_BACKEND_END