void FOpenGL4::ProcessExtensions( const FString& ExtensionsString )
{
int32 MajorVersion =0;
int32 MinorVersion =0;
FString Version = ANSI_TO_TCHAR((const ANSICHAR*)glGetString(GL_VERSION));
FString MajorString, MinorString;
if (Version.Split(TEXT("."), &MajorString, &MinorString))
{
MajorVersion = FCString::Atoi(*MajorString);
MinorVersion = FCString::Atoi(*MinorString);
}
check(MajorVersion!=0);
bSupportsGPUMemoryInfo = ExtensionsString.Contains(TEXT("GL_NVX_gpu_memory_info"));
bSupportsComputeShaders = ExtensionsString.Contains(TEXT("GL_ARB_compute_shader")) || (MajorVersion ==4 && MinorVersion >= 3) || (MajorVersion > 4);
bSupportsVertexAttribBinding = ExtensionsString.Contains(TEXT("GL_ARB_vertex_attrib_binding")) || (MajorVersion == 4 && MinorVersion >= 3) || (MajorVersion > 4);
bSupportsTextureView = ExtensionsString.Contains(TEXT("GL_ARB_texture_view")) || (MajorVersion == 4 && MinorVersion >= 3) || (MajorVersion > 4);
//Process Queries after extensions to avoid queries that use functionality that might not be present
ProcessQueryGLInt();
FOpenGL3::ProcessExtensions(ExtensionsString);
}
void FOpenGLES2::ProcessExtensions( const FString& ExtensionsString )
{
ProcessQueryGLInt();
FOpenGLBase::ProcessExtensions(ExtensionsString);
bSupportsMapBuffer = ExtensionsString.Contains(TEXT("GL_OES_mapbuffer"));
bSupportsDepthTexture = ExtensionsString.Contains(TEXT("GL_OES_depth_texture"));
bSupportsOcclusionQueries = ExtensionsString.Contains(TEXT("GL_ARB_occlusion_query2")) || ExtensionsString.Contains(TEXT("GL_EXT_occlusion_query_boolean"));
bSupportsDisjointTimeQueries = ExtensionsString.Contains(TEXT("GL_EXT_disjoint_timer_query")) || ExtensionsString.Contains(TEXT("GL_NV_timer_query"));
bTimerQueryCanBeDisjoint = !ExtensionsString.Contains(TEXT("GL_NV_timer_query"));
bSupportsRGBA8 = ExtensionsString.Contains(TEXT("GL_OES_rgb8_rgba8"));
bSupportsBGRA8888 = ExtensionsString.Contains(TEXT("GL_APPLE_texture_format_BGRA8888")) || ExtensionsString.Contains(TEXT("GL_IMG_texture_format_BGRA8888")) || ExtensionsString.Contains(TEXT("GL_EXT_texture_format_BGRA8888"));
bSupportsVertexHalfFloat = ExtensionsString.Contains(TEXT("GL_OES_vertex_half_float"));
bSupportsTextureFloat = ExtensionsString.Contains(TEXT("GL_OES_texture_float"));
bSupportsTextureHalfFloat = ExtensionsString.Contains(TEXT("GL_OES_texture_half_float"));
bSupportsSGRB = ExtensionsString.Contains(TEXT("GL_EXT_sRGB"));
bSupportsColorBufferHalfFloat = ExtensionsString.Contains(TEXT("GL_EXT_color_buffer_half_float"));
bSupportsShaderFramebufferFetch = ExtensionsString.Contains(TEXT("GL_EXT_shader_framebuffer_fetch")) || ExtensionsString.Contains(TEXT("GL_NV_shader_framebuffer_fetch"));
bSupportsMultisampledRenderToTexture = ExtensionsString.Contains(TEXT("GL_EXT_multisampled_render_to_texture"));
// @todo ios7: SRGB support does not work with our texture format setup (ES2 docs indicate that internalFormat and format must match, but they don't at all with sRGB enabled)
// One possible solution us to use GLFormat.InternalFormat[bSRGB] instead of GLFormat.Format
bSupportsSGRB = false;//ExtensionsString.Contains(TEXT("GL_EXT_sRGB"));
bSupportsDXT = ExtensionsString.Contains(TEXT("GL_NV_texture_compression_s3tc")) || ExtensionsString.Contains(TEXT("GL_EXT_texture_compression_s3tc"));
bSupportsPVRTC = ExtensionsString.Contains(TEXT("GL_IMG_texture_compression_pvrtc")) ;
bSupportsATITC = ExtensionsString.Contains(TEXT("GL_ATI_texture_compression_atitc")) || ExtensionsString.Contains(TEXT("GL_AMD_compressed_ATC_texture"));
bSupportsETC1 = ExtensionsString.Contains(TEXT("GL_OES_compressed_ETC1_RGB8_texture"));
bSupportsVertexArrayObjects = ExtensionsString.Contains(TEXT("GL_OES_vertex_array_object")) ;
bSupportsDiscardFrameBuffer = ExtensionsString.Contains(TEXT("GL_EXT_discard_framebuffer"));
bSupportsNVFrameBufferBlit = ExtensionsString.Contains(TEXT("GL_NV_framebuffer_blit"));
bSupportsPackedDepthStencil = ExtensionsString.Contains(TEXT("GL_OES_packed_depth_stencil"));
bSupportsShaderTextureLod = ExtensionsString.Contains(TEXT("GL_EXT_shader_texture_lod"));
bSupportsTextureStorageEXT = ExtensionsString.Contains(TEXT("GL_EXT_texture_storage"));
bSupportsCopyTextureLevels = bSupportsTextureStorageEXT && ExtensionsString.Contains(TEXT("GL_APPLE_copy_texture_levels"));
bSupportsTextureNPOT = ExtensionsString.Contains(TEXT("GL_OES_texture_npot")) || ExtensionsString.Contains(TEXT("GL_ARB_texture_non_power_of_two"));
bSupportsStandardDerivativesExtension = ExtensionsString.Contains(TEXT("GL_OES_standard_derivatives"));
if (!bSupportsStandardDerivativesExtension)
{
UE_LOG(LogRHI, Warning, TEXT("GL_OES_standard_derivatives not supported. There may be rendering errors if materials depend on dFdx, dFdy, or fwidth."));
}
// Report shader precision
int Range[2];
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_LOW_FLOAT, Range, &ShaderLowPrecision);
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_MEDIUM_FLOAT, Range, &ShaderMediumPrecision);
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_HIGH_FLOAT, Range, &ShaderHighPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader lowp precision: %d"), ShaderLowPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader mediump precision: %d"), ShaderMediumPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader highp precision: %d"), ShaderHighPrecision);
if ( FPlatformMisc::IsDebuggerPresent() && UE_BUILD_DEBUG )
{
// Enable GL debug markers if we're running in Xcode
extern int32 GEmitMeshDrawEvent;
GEmitMeshDrawEvent = 1;
GEmitDrawEvents = true;
}
// ES2 requires a color attachment when rendering to depth-only.
GSupportsDepthRenderTargetWithoutColorRenderTarget = false;
}
void FOpenGLES31::ProcessExtensions( const FString& ExtensionsString )
{
// Version setup first, need to check string for 3 or higher, then can use integer queries
if (SupportsAdvancedFeatures())
{
glGetIntegerv(GL_MAJOR_VERSION, &MajorVersion);
glGetIntegerv(GL_MINOR_VERSION, &MinorVersion);
bES2Fallback = false;
UE_LOG(LogRHI, Log, TEXT("bES2Fallback = false"));
}
else
{
MajorVersion = 2;
MinorVersion = 0;
bES2Fallback = true;
UE_LOG(LogRHI, Log, TEXT("bES2Fallback = true"));
}
bSupportsSeparateAlphaBlend = ExtensionsString.Contains(TEXT("GL_EXT_draw_buffers_indexed"));
static auto CVarAllowHighQualityLightMaps = IConsoleManager::Get().FindConsoleVariable(TEXT("r.HighQualityLightMaps"));
if (!bES2Fallback)
{
// only supported if we are at a minimum bar
bSupportsTessellation = ExtensionsString.Contains(TEXT("GL_EXT_tessellation_shader"));
bSupportsTextureView = ExtensionsString.Contains(TEXT("GL_EXT_texture_view"));
CVarAllowHighQualityLightMaps->Set(1);
}
else
{
CVarAllowHighQualityLightMaps->Set(0);
}
ProcessQueryGLInt();
FOpenGLBase::ProcessExtensions(ExtensionsString);
bSupportsMapBuffer = ExtensionsString.Contains(TEXT("GL_OES_mapbuffer"));
bSupportsDepthTexture = ExtensionsString.Contains(TEXT("GL_OES_depth_texture"));
bSupportsOcclusionQueries = ExtensionsString.Contains(TEXT("GL_ARB_occlusion_query2")) || ExtensionsString.Contains(TEXT("GL_EXT_occlusion_query_boolean"));
bSupportsRGBA8 = ExtensionsString.Contains(TEXT("GL_OES_rgb8_rgba8"));
bSupportsBGRA8888 = ExtensionsString.Contains(TEXT("GL_APPLE_texture_format_BGRA8888")) || ExtensionsString.Contains(TEXT("GL_IMG_texture_format_BGRA8888")) || ExtensionsString.Contains(TEXT("GL_EXT_texture_format_BGRA8888"));
bSupportsVertexHalfFloat = ExtensionsString.Contains(TEXT("GL_OES_vertex_half_float"));
bSupportsTextureFloat = ExtensionsString.Contains(TEXT("GL_OES_texture_float"));
bSupportsTextureHalfFloat = ExtensionsString.Contains(TEXT("GL_OES_texture_half_float"));
bSupportsSGRB = ExtensionsString.Contains(TEXT("GL_EXT_sRGB"));
bSupportsColorBufferHalfFloat = ExtensionsString.Contains(TEXT("GL_EXT_color_buffer_half_float"));
bSupportsNvImageFormats = ExtensionsString.Contains(TEXT("GL_NV_image_formats"));
bSupportsShaderFramebufferFetch = ExtensionsString.Contains(TEXT("GL_EXT_shader_framebuffer_fetch")) || ExtensionsString.Contains(TEXT("GL_NV_shader_framebuffer_fetch")) || ExtensionsString.Contains(TEXT("GL_ARM_shader_framebuffer_fetch"));
bSupportsShaderDepthStencilFetch = ExtensionsString.Contains(TEXT("GL_ARM_shader_framebuffer_fetch_depth_stencil"));
bSupportsMultisampledRenderToTexture = ExtensionsString.Contains(TEXT("GL_EXT_multisampled_render_to_texture"));
// @todo es3: SRGB support does not work with our texture format setup (ES2 docs indicate that internalFormat and format must match, but they don't at all with sRGB enabled)
// One possible solution us to use GLFormat.InternalFormat[bSRGB] instead of GLFormat.Format
bSupportsSGRB = false;//ExtensionsString.Contains(TEXT("GL_EXT_sRGB"));
bSupportsDXT = ExtensionsString.Contains(TEXT("GL_NV_texture_compression_s3tc")) || ExtensionsString.Contains(TEXT("GL_EXT_texture_compression_s3tc"));
bSupportsPVRTC = ExtensionsString.Contains(TEXT("GL_IMG_texture_compression_pvrtc")) ;
bSupportsATITC = ExtensionsString.Contains(TEXT("GL_ATI_texture_compression_atitc")) || ExtensionsString.Contains(TEXT("GL_AMD_compressed_ATC_texture"));
bSupportsETC1 = ExtensionsString.Contains(TEXT("GL_OES_compressed_ETC1_RGB8_texture"));
bSupportsVertexArrayObjects = ExtensionsString.Contains(TEXT("GL_OES_vertex_array_object")) ;
bSupportsDiscardFrameBuffer = ExtensionsString.Contains(TEXT("GL_EXT_discard_framebuffer"));
bSupportsNVFrameBufferBlit = ExtensionsString.Contains(TEXT("GL_NV_framebuffer_blit"));
bSupportsPackedDepthStencil = ExtensionsString.Contains(TEXT("GL_OES_packed_depth_stencil"));
bSupportsShaderTextureLod = ExtensionsString.Contains(TEXT("GL_EXT_shader_texture_lod"));
bSupportsTextureStorageEXT = ExtensionsString.Contains(TEXT("GL_EXT_texture_storage"));
bSupportsCopyTextureLevels = bSupportsTextureStorageEXT && ExtensionsString.Contains(TEXT("GL_APPLE_copy_texture_levels"));
bSupportsDisjointTimeQueries = ExtensionsString.Contains(TEXT("GL_EXT_disjoint_timer_query"));// || ExtensionsString.Contains(TEXT("GL_NV_timer_query"));
bTimerQueryCanBeDisjoint = !ExtensionsString.Contains(TEXT("GL_NV_timer_query"));
bSupportsNvTimerQuery = ExtensionsString.Contains(TEXT("GL_NV_timer_query"));
// Report shader precision
int Range[2];
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_LOW_FLOAT, Range, &ShaderLowPrecision);
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_MEDIUM_FLOAT, Range, &ShaderMediumPrecision);
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_HIGH_FLOAT, Range, &ShaderHighPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader lowp precision: %d"), ShaderLowPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader mediump precision: %d"), ShaderMediumPrecision);
UE_LOG(LogRHI, Log, TEXT("Fragment shader highp precision: %d"), ShaderHighPrecision);
// Test whether the GPU can support volume-texture rendering.
// There is no API to query this - you just have to test whether a 3D texture is framebuffer-complete.
if (!bES2Fallback)
{
GLuint FrameBuffer;
glGenFramebuffers(1, &FrameBuffer);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FrameBuffer);
GLuint VolumeTexture;
glGenTextures(1, &VolumeTexture);
glBindTexture(GL_TEXTURE_3D, VolumeTexture);
glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 256, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glFramebufferTextureEXT(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, VolumeTexture, 0);
bSupportsVolumeTextureRendering = (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
glDeleteTextures(1, &VolumeTexture);
glDeleteFramebuffers(1, &FrameBuffer);
}
bSupportsCopyImage = ExtensionsString.Contains(TEXT("GL_EXT_copy_image"));
}
void FOpenGL3::ProcessExtensions( const FString& ExtensionsString )
{
ProcessQueryGLInt();
FOpenGLBase::ProcessExtensions(ExtensionsString);
}