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OpenGLHostDisplay: Work around functions unavailable in GLES2

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This commit is contained in:
Connor McLaughlin
2021-01-26 01:34:13 +10:00
parent 24dd49e05d
commit 8cafe856f0
2 changed files with 37 additions and 17 deletions
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23
src/common/gl/texture.cpp
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@ -184,24 +184,33 @@ void Texture::GetTextureSubImage(GLuint texture, GLint level, GLint xoffset, GLi
return;
}
GLenum target = GL_READ_FRAMEBUFFER;
GLenum target_binding = GL_READ_FRAMEBUFFER_BINDING;
if (GLAD_GL_ES_VERSION_2_0 && !GLAD_GL_ES_VERSION_3_0)
{
// GLES2 doesn't have GL_READ_FRAMEBUFFER.
target = GL_FRAMEBUFFER;
target_binding = GL_FRAMEBUFFER_BINDING;
}
Assert(depth == 1);
GLuint old_read_fbo;
glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, reinterpret_cast<GLint*>(&old_read_fbo));
glGetIntegerv(target_binding, reinterpret_cast<GLint*>(&old_read_fbo));
GLuint temp_fbo;
glGenFramebuffers(1, &temp_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, temp_fbo);
glBindFramebuffer(target, temp_fbo);
if (zoffset > 0 && (GLAD_GL_VERSION_3_0 || GLAD_GL_ES_VERSION_3_0))
glFramebufferTextureLayer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture, level, zoffset);
glFramebufferTextureLayer(target, GL_COLOR_ATTACHMENT0, texture, level, zoffset);
else
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
glFramebufferTexture2D(target, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
DebugAssert(glCheckFramebufferStatus(GL_READ_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
DebugAssert(glCheckFramebufferStatus(target) == GL_FRAMEBUFFER_COMPLETE);
glReadPixels(xoffset, yoffset, width, height, format, type, pixels);
glBindFramebuffer(GL_READ_FRAMEBUFFER, old_read_fbo);
glBindFramebuffer(target, old_read_fbo);
glDeleteFramebuffers(1, &temp_fbo);
}
} // namespace GL
} // namespace GL