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axmol/core/renderer/backend/opengl/DeviceInfoGL.cpp

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/****************************************************************************
Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2020 C4games Ltd
https://axmolengine.github.io/
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/GL.h"
#include "base/axstd.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
NS_AX_BACKEND_BEGIN
static GLuint compileShader(GLenum shaderType, const GLchar* source)
{
auto shader = glCreateShader(shaderType);
if (!shader)
return 0;
glShaderSource(shader, 1, &source, nullptr);
glCompileShader(shader);
GLint status = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status)
return shader;
GLint logLength = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 1)
{
auto errorLog = axstd::make_unique_for_overwrite<char[]>(static_cast<size_t>(logLength));
glGetShaderInfoLog(shader, logLength, nullptr, (GLchar*)errorLog.get());
ax::print("axmol:ERROR: Failed to compile shader, detail: %s\n%s", errorLog.get(), source);
}
else
{
ax::print("axmol:ERROR: Failed to compile shader without errors.");
}
glDeleteShader(shader);
return 0;
}
static void setTexParams() {
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);
}
/// <summary>
/// render 1x1 to back framebuffer to detect whether GPU support astc compressed texture really
/// </summary>
/// <returns>true: support, false: not support</returns>
static bool checkReallySupportsASTC()
{
// 1x1/2x2 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);
setTexParams();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glCompressedTexImage2D(GL_TEXTURE_2D,
0, // level
GL_COMPRESSED_RGBA_ASTC_4x4_KHR, // format
1, 1, // texture dim
0, // border
sizeof(astctexels), // dataLen,
astctexels);
auto error = glGetError();
if (!error)
{
// prepare a back frame buffer
GLuint defaultFBO{0};
glGetIntegerv(GL_FRAMEBUFFER_BINDING, reinterpret_cast<GLint*>(&defaultFBO));
GLuint fbo{0};
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
/// color attachment0
GLuint colorAttachment = 0;
glGenTextures(1, &colorAttachment);
glBindTexture(GL_TEXTURE_2D, colorAttachment);
setTexParams();
uint8_t black1x1[] = {0x00, 0x00, 0x00, 0x00}; // 1*1*4
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, black1x1);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorAttachment, 0);
//GLenum buffers[1] = {GL_COLOR_ATTACHMENT0};
//glDrawBuffers(1, buffers);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE)
{ // does back framebuffer reandy for render
// render 1 frame to back framebuffer
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float vertices[] = {
// positions // texture coords
1.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top right
1.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom right
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom left
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f // top left
};
unsigned int indices[] = {
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
GLuint defaultVAO{0};
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, reinterpret_cast<GLint*>(&defaultVAO));
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// texture coord attribute
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// create shader program
const char* vertexShader = R"(#version 100
precision highp float;
attribute vec3 aPos;
attribute vec2 aTexCoord;
varying vec2 TexCoord;
void main()
{
gl_Position = vec4(aPos, 1.0);
TexCoord = vec2(aTexCoord.x, aTexCoord.y);
})";
const char* fragShader = R"(#version 100
precision highp float;
varying vec2 TexCoord;
uniform sampler2D u_tex0;
void main()
{
gl_FragColor = texture2D(u_tex0, TexCoord);
}
)";
auto vShader = compileShader(GL_VERTEX_SHADER, vertexShader);
auto fShader = compileShader(GL_FRAGMENT_SHADER, fragShader);
auto program = glCreateProgram();
glAttachShader(program, vShader);
glAttachShader(program, fShader);
glLinkProgram(program);
// render frame
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texID);
glClearColor(0.0, 0.0, 0.0, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(program);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
// read pixel RGB: should be: 255, 128, 0
uint8_t pixels[4] = {0};
glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
if (pixels[0] != 255 || pixels[1] != 128)
error = GL_INVALID_VALUE;
// clean render resources: VBO, VAO, EBO, program, vShader, fShader
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
glDeleteVertexArrays(1, &VAO);
glDeleteProgram(program);
glDeleteShader(vShader);
glDeleteShader(fShader);
// restore binding to defaultVAO
glBindVertexArray(defaultVAO);
error = glGetError();
}
else
error = GL_INVALID_VALUE;
// clean framebuffer resources
glDeleteTextures(1, &colorAttachment);
glDeleteFramebuffers(1, &fbo);
// restore binding to defaultFBO
glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
error = glGetError();
}
// clean test astc texture
glDeleteTextures(1, &texID);
glBindTexture(GL_TEXTURE_2D, 0);
return !error;
}
bool DeviceInfoGL::init()
{
// These queries work with all GL/GLES versions!
_vendor = (char const*)glGetString(GL_VENDOR);
_renderer = (char const*)glGetString(GL_RENDERER);
_version = (char const*)glGetString(GL_VERSION);
_shaderVer = (char const*)glGetString(GL_SHADING_LANGUAGE_VERSION);
// caps
glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &_maxAttributes);
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &_maxTextureSize);
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &_maxTextureUnits);
// exts
#if AX_GLES_PROFILE != 200 // NOT GLES2.0
GLint NumberOfExtensions{0};
glGetIntegerv(GL_NUM_EXTENSIONS, &NumberOfExtensions);
for (GLint i = 0; i < NumberOfExtensions; ++i)
{
auto extName = (const char*)glGetStringi(GL_EXTENSIONS, i);
if (extName)
_glExtensions.emplace(extName);
}
#else
auto extensions = (const char*)glGetString(GL_EXTENSIONS);
if (extensions)
_glExtensions = extensions;
#endif
return true;
}
const char* DeviceInfoGL::getVendor() const
{
return _vendor;
}
const char* DeviceInfoGL::getRenderer() const
{
return _renderer;
}
const char* DeviceInfoGL::getVersion() const
{
return _version;
}
const char* DeviceInfoGL::getShaderVersion() const
{
return _shaderVer;
}
bool DeviceInfoGL::checkForFeatureSupported(FeatureType feature)
{
bool featureSupported = false;
switch (feature)
{
case FeatureType::ETC1:
featureSupported = hasExtension("GL_OES_compressed_ETC1_RGB8_texture"sv);
break;
case FeatureType::ETC2:
featureSupported = checkSupportsCompressedFormat(GL_COMPRESSED_RGBA8_ETC2_EAC);
break;
case FeatureType::S3TC:
#ifdef GL_EXT_texture_compression_s3tc
featureSupported = hasExtension("GL_EXT_texture_compression_s3tc"sv);
#endif
break;
case FeatureType::AMD_COMPRESSED_ATC:
featureSupported = hasExtension("GL_AMD_compressed_ATC_texture"sv);
break;
case FeatureType::PVRTC:
featureSupported = hasExtension("GL_IMG_texture_compression_pvrtc"sv);
break;
case FeatureType::IMG_FORMAT_BGRA8888:
featureSupported = hasExtension("GL_IMG_texture_format_BGRA8888"sv);
break;
case FeatureType::DISCARD_FRAMEBUFFER:
featureSupported = hasExtension("GL_EXT_discard_framebuffer"sv);
break;
case FeatureType::PACKED_DEPTH_STENCIL:
featureSupported = hasExtension("GL_OES_packed_depth_stencil"sv);
break;
case FeatureType::VAO:
#ifdef AX_PLATFORM_PC
featureSupported = hasExtension("vertex_array_object"sv);
#else
featureSupported = hasExtension("GL_OES_vertex_array_object"sv);
#endif
break;
case FeatureType::MAPBUFFER:
featureSupported = hasExtension("GL_OES_mapbuffer"sv);
break;
case FeatureType::DEPTH24:
featureSupported = hasExtension("GL_OES_depth24"sv);
break;
case FeatureType::ASTC:
featureSupported = checkSupportsCompressedFormat(GL_COMPRESSED_RGBA_ASTC_4x4_KHR) && checkReallySupportsASTC();
break;
default:
break;
}
return featureSupported;
}
bool DeviceInfoGL::hasExtension(std::string_view searchName) const
{
#if AX_GLES_PROFILE != 200
return _glExtensions.find(searchName) != _glExtensions.end();
#else
return _glExtensions.find(searchName) != std::string::npos;
#endif
}
std::string DeviceInfoGL::dumpExtensions() const
{
#if AX_GLES_PROFILE != 200
std::string strExts;
for (auto& extName : _glExtensions)
{
strExts += extName;
strExts += ',';
}
return strExts;
#else
return _glExtensions;
#endif
}
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;
}
NS_AX_BACKEND_END
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